/*
Theme Name: QuickQ Stellar
Theme URI: https://quickqvpn.example.com/stellar
Author: Stellar Drift Studio
Author URI: https://quickqvpn.example.com
Description: 面向跨境 VPN、隐私 SaaS、远程协作品牌的着陆页主题。「Stellar Drift · 星宇航迹」调色板以靛宇钴蓝（indigo-600）为主轴蓝，配以青霜湖光（teal-500）与金穗琥珀（amber-500）作冷暖对位锚点，覆盖晨穹薄靛（indigo-50）画布；内置嵌套式 JSON-LD 知识图（Organization · Service · SoftwareApplication · FAQPage · HowTo · DefinedTermSet · Article · Speakable · BreadcrumbList 等）、hreflang × canonical 协同钩子、Intent-driven Prefetch 与 Core Web Vitals 友好默认值。
Version: 15.0.0
Requires at least: 6.2
Tested up to: 6.8
Requires PHP: 7.4
License: GPLv2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: qq-stellar
Tags: blog, landing-page, vpn, saas, privacy, blue, light, accessibility-ready, two-columns, three-columns
*/

/* =============================================================================
 * 00 · Stellar Drift — design tokens（v15.0 星宇航迹 · Stellar）
 * ---------------------------------------------------------------------------
 * 主题代号：QuickQ Stellar · Stellar Drift（星宇航迹 · v15）
 *
 * 代际差异（v14 星宇航迹·Horizon 旧色板 → v15 星宇航迹·Stellar 新色板）：
 *   | 作用       | v14 Horizon·旧（靛宇钴蓝族）         | v15 Stellar·本代（靛宇钴蓝族）           |
 *   |------------|--------------------------------------|------------------------------------------|
 *   | 主轴蓝     | 远洋钴青 sky-600     #0284c7 (H≈200°)| 靛宇钴蓝 indigo-600 #4f46e5 (H≈243°)    |
 *   | 主轴深     | 经纬蓝穹 sky-700     #0369a1         | 穹宇靛蓝 indigo-700 #4338ca              |
 *   | 最深底     | 远渊墨蓝 sky-950     #082f49         | 渊际墨靛 indigo-950 #1e1b4b              |
 *   | 冷辅色     | 暮霭紫罗 violet-500  #8b5cf6 (H≈258°)| 青霜湖光 teal-500   #14b8a6 (H≈173°)    |
 *   | 暖辅色     | 朝阳玫珊 rose-500    #f43f5e (H≈350°)| 金穗琥珀 amber-500  #f59e0b (H≈38°)     |
 *   | 画布底     | 远海薄霁 sky-50      #f0f9ff         | 晨穹薄靛 indigo-50  #eef2ff              |
 *   | 墨色文字   | 远洋星墨 slate-900   #0f172a         | 渊际星墨 slate-900  #0f172a (沿用 slate) |
 *   | 边线      | 远海雾青 sky-200     #bae6fd         | 穹宇雾靛 indigo-200 #c7d2fe              |
 *   | 成功语义   | 远海翠青 teal-600    #0d9488         | 星苗翠绿 emerald-600 #059669 (避 teal 撞)|
 *   | 紧急语义   | 紧急玫珊 rose-600    #e11d48         | 紧急猩红 red-600    #dc2626 (避 amber 撞)|
 *
 * 设计意图（保留蓝色基调、整体观感明显焕新）：
 *   1) 主轴蓝由"靛宇钴蓝（偏青澈 H≈200°）"切到"靛宇钴蓝（偏紫蓝 H≈243°）"——
 *      色相向紫色方向旋转 43°、明度更深、彩度更浓；从"星宇航迹远眺"切换到
 *      "夜空星轨远眺"，整体气质从"开阔、湿润、明亮"切到"深邃、清冷、静穆"。
 *   2) 冷对位锚点从"青霜湖光（紫色 H≈258°）"切到"青霜湖光（青绿 H≈173°）"——
 *      色相旋转近 85°，是本代最明显的视觉差异点之一；与靛蓝形成"夜穹 + 冰川"
 *      的对位高光，气质从"暮霭通透"切到"星霜清冽"。
 *   3) 暖对位锚点从"金穗琥珀（珊瑚红 H≈350°）"切到"金穗琥珀（金黄 H≈38°）"——
 *      色相旋转近 48°，从"地平朝阳"切到"星轨流金"，配合青霜形成
 *      "金穗星点 × 青霜冷穹"的"夜空双子星"配色气场。
 *   4) 画布底从 sky-50 切到 indigo-50（更偏紫蓝），与主轴同色系，更"晨穹薄靛"。
 *   5) 阴影族从"渊际星墨（rgba 8,47,73）"切到"渊际星墨（rgba 30,27,75 / 17,24,39）"，
 *      投影更深邃、更"夜空"，符合"星轨远眺"的清冷感。
 *   6) hero 渐变由"渊际墨靛 → 穹宇靛蓝 → 靛宇钴蓝 + 玫珊晕 + 紫罗晕"重写为
 *      "渊际墨靛 → 穹宇靛蓝 → 靛宇钴蓝 + 金穗琥珀晕 + 青霜湖光晕"三段式，
 *      左下"金穗"、右上"青霜"形成"星轨双晕"对仗。
 *   7) Logo / Favicon 由"地平线日轮 + 双层经纬弧 + 玫珊半轮朝阳徽"重塑为
 *      "北极星徽 + 双层星轨弧 + 金穗八芒星辉（含青霜冰晕）"，
 *      去除"地平日出"母题，强化"星轨北极星"母题。
 *
 * 工程命名（v15 本代）：
 *   • CSS class / 变量前缀：qsd- / --qsd-（v14 为 qhr- / --qhr-）
 *   • Data 属性前缀：       data-qsd-*（v14 为 data-qhr-*）
 *   • PHP 函数前缀：        qstd_*（v14 为 qhor_*）
 *   • 文本域：              qq-stellar（v14 为 qq-horizon）
 *   • 主 JS：               stellar.js（v14 为 horizon.js）
 * ============================================================================= */

:root {
  /* —— surfaces · 晨穹薄靛 + 渊际墨靛 —— */
  --qsd-bg:           #eef2ff;   /* 画布底：晨穹薄靛（indigo-50） */
  --qsd-bg-alt:       #e0e7ff;   /* 区块交替：穹宇微靛（indigo-100） */
  --qsd-surface:      #ffffff;   /* 卡片底 */
  --qsd-surface-soft: #f0fdfa;   /* 弱卡片 / 行高亮：星霜薄青（teal-50） */
  --qsd-surface-deep: #312e81;   /* 渊际穹深（indigo-900），反白底用 */

  /* —— ink / typography · 渊际星墨族（v15 继续沿用 slate-900，与新靛蓝主轴更冷协调） —— */
  --qsd-ink:        #0f172a;     /* 主标题墨：渊际星墨（slate-900） */
  --qsd-ink-soft:   #312e81;     /* 副标题：渊际穹深（indigo-900） */
  --qsd-text:       #3730a3;     /* 正文：穹宇墨蓝（indigo-800） */
  --qsd-text-soft:  #475569;     /* 辅助文字：星雾灰（slate-600） */
  --qsd-text-faint: #94a3b8;     /* 标签 / 占位：远星灰（slate-400） */

  /* —— brand · 靛宇钴蓝主轴（保留蓝色基调，色相由 200° 旋转到 243°） —— */
  --qsd-primary:        #4f46e5; /* 靛宇钴蓝（indigo-600，主） */
  --qsd-primary-strong: #4338ca; /* 穹宇靛蓝（indigo-700） */
  --qsd-primary-soft:   #e0e7ff; /* 主轴浅底：穹宇微靛（indigo-100） */
  --qsd-primary-deep:   #1e1b4b; /* 主轴最深：渊际墨靛（indigo-950） */
  --qsd-secondary:      #312e81; /* 渊际穹深辅色（indigo-900） · 用于次级 CTA / 标签 */
  --qsd-azure:          #818cf8; /* 高亮夜穹（indigo-400，hero 反白氛围） */

  /* —— accent · 青霜湖光（冷对位 · v15 关键差异：紫罗暮霭→青霜湖光） —— */
  --qsd-cyan:           #14b8a6; /* 青霜湖光（teal-500，变量名沿用 cyan 仅为兼容旧选择器） */
  --qsd-cyan-strong:    #0f766e; /* 青霜深（teal-700） */
  --qsd-cyan-soft:      #ccfbf1; /* 青霜浅（teal-100） */

  /* —— accent · 金穗琥珀（暖对位 · v15 关键差异：玫珊朝阳→金穗琥珀） —— */
  --qsd-amber:          #f59e0b; /* 金穗琥珀（amber-500） */
  --qsd-amber-strong:   #b45309; /* 金穗深（amber-700） */
  --qsd-amber-soft:     #fef3c7; /* 金穗浅（amber-100） */

  /* —— signal · 语义色（v15 与冷辅 teal / 暖辅 amber 显式区隔，避免视觉撞色） —— */
  --qsd-success: #059669;        /* emerald-600 · 星苗翠绿（避开冷辅 teal 同族） */
  --qsd-warn:    #ea580c;        /* orange-600 · 警示橙 */
  --qsd-danger:  #dc2626;        /* red-600 · 紧急猩红（避开暖辅 amber 同族） */

  /* —— borders & shadows · 穹宇雾靛阴影族（v15 由渊际星墨 → 渊际墨靛） —— */
  --qsd-border:        #c7d2fe;  /* indigo-200 · 穹宇雾靛线 */
  --qsd-border-strong: #818cf8;  /* indigo-400 · 强调线 */
  --qsd-shadow-xs: 0 1px 2px rgba(30, 27, 75, 0.06);
  --qsd-shadow-sm: 0 2px 14px rgba(30, 27, 75, 0.10);
  --qsd-shadow:    0 18px 44px rgba(30, 27, 75, 0.16);
  --qsd-shadow-lg: 0 36px 80px rgba(15, 23, 42, 0.30);
  --qsd-glow:      0 0 0 6px rgba(79, 70, 229, 0.16),
                  0 14px 32px rgba(20, 184, 166, 0.30);
  --qsd-glow-amber: 0 0 0 6px rgba(79, 70, 229, 0.14),
                   0 14px 32px rgba(245, 158, 11, 0.34);

  /* —— hero · 星宇航迹北极星双晕渐变（v15：左下金穗琥珀晕 · 右上青霜湖光晕） —— */
  --qsd-hero-grad:
    radial-gradient(ellipse 70% 78% at 86% 14%, rgba(20, 184, 166, 0.40), transparent 56%),
    radial-gradient(circle  at 12% 86%, rgba(245, 158, 11, 0.30), transparent 58%),
    linear-gradient(158deg, #1e1b4b 0%, #312e81 24%, #3730a3 50%, #4f46e5 80%, #818cf8 100%);
  --qsd-tide-cyan:  radial-gradient(circle, rgba(20, 184, 166, 0.55), transparent 65%);
  --qsd-tide-amber: radial-gradient(circle, rgba(245, 158, 11, 0.55), transparent 65%);

  /* —— radius scale —— */
  --qsd-radius-xs: 8px;
  --qsd-radius-sm: 12px;
  --qsd-radius:    18px;
  --qsd-radius-lg: 26px;
  --qsd-radius-xl: 36px;
  --qsd-pill:      999px;

  /* —— layout —— */
  --qsd-container: 1180px;
  --qsd-gutter:    24px;

  /* —— motion —— */
  --qsd-ease:     cubic-bezier(0.32, 0.72, 0, 1);
  --qsd-ease-out: cubic-bezier(0.2, 0.9, 0.3, 1);
  --qsd-tx-xs:    0.18s var(--qsd-ease);
  --qsd-tx-sm:    0.26s var(--qsd-ease);
  --qsd-tx-md:    0.42s var(--qsd-ease);
  --qsd-tx-lg:    0.72s var(--qsd-ease-out);

  /* —— typography —— */
  --qsd-font:
    -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", Inter,
    Roboto, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    Helvetica, Arial, sans-serif;
  --qsd-font-mono:
    "JetBrains Mono", "Cascadia Code", ui-monospace, "SFMono-Regular",
    "Roboto Mono", monospace;
}

/* =============================================================================
 * 01 · Reset & base
 * ============================================================================= */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--qsd-font);
  font-size: 16px;
  color: var(--qsd-text);
  background: var(--qsd-bg);
  /* 星宇航迹三轴微光：右上青霜湖光、左上靛宇钴蓝、底部金穗琥珀 */
  background-image:
    radial-gradient(circle at 96% -4%,  rgba(20, 184, 166, 0.10), transparent 42%),
    radial-gradient(circle at 4% 6%,    rgba(79, 70, 229, 0.08), transparent 40%),
    radial-gradient(circle at 50% 108%, rgba(245, 158, 11, 0.10), transparent 50%);
  background-attachment: fixed;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.qsd-no-scroll { overflow: hidden; }

a { color: inherit; text-decoration: none; }
a[role="link"] { cursor: pointer; }

img,
svg { max-width: 100%; display: block; }

button { font-family: inherit; }

::selection {
  background: var(--qsd-cyan);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--qsd-amber);
  outline-offset: 2px;
}

/* =============================================================================
 * 02 · Layout primitives
 * ============================================================================= */

.qsd-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
}

.qsd-container {
  width: min(92%, var(--qsd-container));
  margin-inline: auto;
}

.qsd-main { flex: 1; }

.qsd-section { padding: 96px 0; }
.qsd-section--tight { padding-top: 32px; }
.qsd-section--alt {
  position: relative;
  background:
    linear-gradient(180deg, rgba(79, 70, 229, 0.05), transparent 55%),
    linear-gradient(180deg, rgba(20, 184, 166, 0.05), transparent 85%);
}

.qsd-section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 50px;
}

/* eyebrow · 钴蓝软底 + 青霜星轨渐变线 */
.qsd-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--qsd-primary-strong);
  background: linear-gradient(90deg, var(--qsd-primary-soft), #fff 70%);
  border: 1px solid rgba(79, 70, 229, 0.20);
  border-radius: var(--qsd-pill);
  padding: 7px 16px 7px 10px;
  margin: 0 0 16px;
}

.qsd-eyebrow::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--qsd-primary), var(--qsd-cyan));
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.18);
}

.qsd-section-head h2 {
  margin: 0 0 14px;
  font-size: clamp(1.65rem, 3.2vw, 2.4rem);
  letter-spacing: -0.01em;
  color: var(--qsd-ink);
  line-height: 1.22;
}

.qsd-section-head p {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 1.04rem;
}

/* 渐变文字 · 钴蓝 → 青霜湖光 → 金穗琥珀 */
.qsd-gradient-text {
  background: linear-gradient(95deg, var(--qsd-primary) 12%, var(--qsd-cyan) 55%, var(--qsd-amber));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* —— 屏幕阅读器专用文本 —— */
.qsd-sr {
  position: absolute !important;
  clip: rect(1px, 1px, 1px, 1px);
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
}

/* —— 跳过到主内容 · a11y —— */
.qsd-skip {
  position: absolute;
  top: -40px;
  left: 12px;
  background: var(--qsd-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--qsd-radius-sm);
  z-index: 999;
  transition: top 0.2s var(--qsd-ease);
}

.qsd-skip:focus { top: 12px; }

/* =============================================================================
 * 03 · Header & Navigation
 * ============================================================================= */

.qsd-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(244, 245, 251, 0.80);
  backdrop-filter: blur(18px) saturate(170%);
  -webkit-backdrop-filter: blur(18px) saturate(170%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs),
              background var(--qsd-tx-xs);
}

.qsd-header.is-pinned {
  border-bottom-color: rgba(79, 70, 229, 0.16);
  box-shadow: var(--qsd-shadow-sm);
  background: rgba(255, 255, 255, 0.96);
}

.qsd-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  min-height: 74px;
}

.qsd-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
  color: var(--qsd-ink);
}

/* logo 容器 · 深靛墨水 + 右上青霜湖光 + 左下金穗琥珀朝霞 */
.qsd-brand__mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 12px;
  background: linear-gradient(150deg, #1e1b4b 0%, #1e1b4b 50%, #4338ca 100%);
  padding: 7px;
  display: grid;
  place-items: center;
  box-shadow: 0 8px 22px rgba(79, 70, 229, 0.40);
  position: relative;
  overflow: hidden;
}

.qsd-brand__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.55), transparent 55%),
    radial-gradient(circle at 20% 78%, rgba(245, 158, 11, 0.42), transparent 55%);
  pointer-events: none;
}

.qsd-brand__mark img,
.qsd-brand__mark svg {
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 1;
}

.qsd-brand__name {
  background: linear-gradient(95deg, var(--qsd-ink) 30%, var(--qsd-primary) 65%, var(--qsd-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.qsd-nav { display: flex; }

.qsd-nav ul,
.qsd-mobile-nav ul {
  display: flex;
  gap: 4px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.qsd-nav a {
  display: inline-flex;
  align-items: center;
  color: var(--qsd-text-soft);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 9px 14px;
  border-radius: var(--qsd-radius-sm);
  transition: color var(--qsd-tx-xs), background var(--qsd-tx-xs);
  position: relative;
}

.qsd-nav a:hover,
.qsd-nav a:focus-visible,
.qsd-nav a[aria-current] {
  color: var(--qsd-primary-strong);
  background: var(--qsd-primary-soft);
}

/* 当前页指示：底部 2px 青霜湖光 → 金穗琥珀朝霞渐变线 */
.qsd-nav a[aria-current]::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--qsd-cyan), var(--qsd-amber));
}

.qsd-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.qsd-menu-toggle {
  display: none;
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  border-radius: var(--qsd-radius-sm);
  font-weight: 600;
  padding: 9px 14px;
  cursor: pointer;
  transition: background var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-menu-toggle:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
}

/* —— 移动端抽屉 —— */
.qsd-mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(30, 27, 75, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--qsd-tx-md);
  backdrop-filter: blur(4px);
}

.qsd-mobile-overlay.is-shown {
  opacity: 1;
  pointer-events: auto;
}

.qsd-mobile-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(82vw, 380px);
  height: 100vh;
  z-index: 120;
  background: var(--qsd-surface);
  border-left: 1px solid var(--qsd-border);
  box-shadow: -28px 0 70px rgba(30, 27, 75, 0.3);
  transform: translate3d(108%, 0, 0);
  visibility: hidden;
  pointer-events: none;
  will-change: transform;
  transition: transform 0.46s var(--qsd-ease),
              visibility 0s linear 0.46s;
  padding: 22px 0;
  touch-action: pan-y;
}

.qsd-mobile-panel.is-shown {
  transform: translate3d(0, 0, 0);
  visibility: visible;
  pointer-events: auto;
  transition: transform 0.46s var(--qsd-ease),
              visibility 0s linear 0s;
}

.qsd-mobile-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.qsd-mobile-close {
  width: 38px;
  height: 38px;
  border-radius: var(--qsd-radius-sm);
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  font-size: 1.2rem;
  cursor: pointer;
}

.qsd-mobile-nav ul {
  flex-direction: column;
  gap: 8px;
}

.qsd-mobile-nav a {
  display: block;
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius-sm);
  padding: 13px 15px;
  color: var(--qsd-text);
  font-weight: 500;
  transition: background var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-mobile-nav a:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

.qsd-mobile-cta {
  display: flex;
  width: 100%;
  margin-top: 18px;
}

/* =============================================================================
 * 04 · Buttons（钴蓝主轴 + 青霜湖光强调按钮 + 金穗琥珀朝霞光晕）
 * ============================================================================= */

.qsd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--qsd-radius-sm);
  border: 1px solid transparent;
  padding: 13px 24px;
  font-weight: 600;
  font-size: 0.97rem;
  letter-spacing: 0.01em;
  transition: transform var(--qsd-tx-xs), background var(--qsd-tx-xs),
              color var(--qsd-tx-xs), border-color var(--qsd-tx-xs),
              box-shadow var(--qsd-tx-xs);
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.qsd-btn:focus-visible {
  outline: 3px solid var(--qsd-amber);
  outline-offset: 2px;
}

/* 主按钮 · 靛宇钴蓝 → 穹宇深靛；hover 在右下绽放青霜湖光光晕 */
.qsd-btn--primary {
  background: linear-gradient(135deg, var(--qsd-primary) 0%, var(--qsd-primary-strong) 100%);
  color: #fff;
  box-shadow: 0 10px 26px rgba(79, 70, 229, 0.40);
}

.qsd-btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--qsd-primary-strong) 0%, var(--qsd-primary-deep) 100%);
  opacity: 0;
  transition: opacity var(--qsd-tx-xs);
  z-index: -1;
}

.qsd-btn--primary::after {
  content: "";
  position: absolute;
  width: 80%;
  height: 220%;
  right: -25%;
  bottom: -140%;
  background: radial-gradient(ellipse, rgba(20, 184, 166, 0.55), transparent 70%);
  opacity: 0;
  transition: opacity var(--qsd-tx-md), transform var(--qsd-tx-md);
  z-index: -1;
}

.qsd-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(79, 70, 229, 0.46),
              0 8px 22px rgba(20, 184, 166, 0.32);
}

.qsd-btn--primary:hover::before { opacity: 1; }
.qsd-btn--primary:hover::after  { opacity: 1; transform: translate(-18%, -12%); }

/* 青霜湖光强调按钮 · 用于二级强 CTA */
.qsd-btn--cyan {
  background: linear-gradient(135deg, var(--qsd-cyan) 0%, var(--qsd-cyan-strong) 100%);
  color: #fff;
  box-shadow: 0 10px 26px rgba(20, 184, 166, 0.42);
}

.qsd-btn--cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(20, 184, 166, 0.52);
  filter: brightness(1.04);
}

/* 幽灵按钮 · 描边 + hover 钴蓝填充 */
.qsd-btn--ghost {
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  border-color: var(--qsd-border);
}

.qsd-btn--ghost:hover {
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
  background: var(--qsd-primary-soft);
  transform: translateY(-1px);
}

/* 暗底反白按钮 · hero 内使用 */
.qsd-btn--on-dark {
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.32);
  backdrop-filter: blur(6px);
}

.qsd-btn--on-dark:hover {
  background: #fff;
  color: var(--qsd-primary-strong);
}

.qsd-btn--inverted {
  background: #fff;
  color: var(--qsd-primary-strong);
}

.qsd-btn--inverted:hover {
  background: var(--qsd-cyan-soft);
  color: var(--qsd-cyan-strong);
}

.qsd-btn--lg {
  padding: 15px 30px;
  font-size: 1.02rem;
  border-radius: var(--qsd-radius);
}

/* =============================================================================
 * 05 · Hero — 北极星徽面板
 * ============================================================================= */

.qsd-hero { padding: 56px 0 36px; }

.qsd-hero__panel {
  position: relative;
  border-radius: var(--qsd-radius-xl);
  padding: 72px 60px;
  background: var(--qsd-hero-grad);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--qsd-shadow-lg);
  isolation: isolate;
}

/* hero 背景：深湾繁星 + 经线条纹（湾光感） */
.qsd-hero__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.2px 1.2px at 14% 22%,   rgba(255,255,255,0.85), transparent),
    radial-gradient(1px 1px   at 76% 18%,     rgba(255,255,255,0.65), transparent),
    radial-gradient(1.4px 1.4px at 36% 64%,   rgba(255,255,255,0.80), transparent),
    radial-gradient(1px 1px   at 62% 78%,     rgba(255,255,255,0.55), transparent),
    radial-gradient(1.6px 1.6px at 88% 48%,   rgba(255,255,255,0.85), transparent),
    radial-gradient(1px 1px   at 22% 86%,     rgba(255,255,255,0.50), transparent),
    repeating-linear-gradient(
      115deg,
      rgba(255, 255, 255, 0.035) 0,
      rgba(255, 255, 255, 0.035) 1px,
      transparent 1px,
      transparent 44px
    );
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.5));
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.5));
  pointer-events: none;
}

/* hero 右上"青霜湖光"光斑 */
.qsd-hero__panel::after {
  content: "";
  position: absolute;
  width: 620px;
  height: 620px;
  right: -180px;
  top: -260px;
  border-radius: 50%;
  background: var(--qsd-tide-cyan);
  pointer-events: none;
  z-index: 0;
}

/* hero 左下"金穗琥珀朝霞"光斑（与星涟形成对角张力） */
.qsd-hero__panel > .qsd-glow-amber {
  position: absolute;
  width: 380px;
  height: 380px;
  left: -130px;
  bottom: -140px;
  border-radius: 50%;
  background: var(--qsd-tide-amber);
  pointer-events: none;
  z-index: 0;
}

/* hero 右上"北极星针"光痕（替代旧主题的"北极星针"） */
.qsd-hero__panel > .qsd-beacon {
  position: absolute;
  width: 110px;
  height: 110px;
  right: 8%;
  top: 14%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.9;
}

.qsd-hero__panel > .qsd-beacon::before,
.qsd-hero__panel > .qsd-beacon::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.85) 50%, transparent 100%);
  filter: blur(0.4px);
}

.qsd-hero__panel > .qsd-beacon::before {
  height: 1.5px;
  top: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 10px rgba(20, 184, 166, 0.85);
  animation: qmBeaconHorz 2.6s ease-in-out infinite;
}

.qsd-hero__panel > .qsd-beacon::after {
  width: 1.5px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.85) 50%, transparent 100%);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.85);
  animation: qmBeaconVert 2.6s ease-in-out infinite;
}

@keyframes qmBeaconHorz {
  0%, 100% { opacity: 0.6; transform: translateY(-50%) scaleX(1);   }
  50%      { opacity: 1;   transform: translateY(-50%) scaleX(1.4); }
}

@keyframes qmBeaconVert {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scaleY(1);   }
  50%      { opacity: 1;   transform: translateX(-50%) scaleY(1.4); }
}

.qsd-hero__grid {
  position: relative;
  display: grid;
  gap: 44px;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  z-index: 1;
}

.qsd-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #c7d2fe;
  border: 1px solid rgba(255, 255, 255, 0.30);
  border-radius: var(--qsd-pill);
  padding: 7px 16px 7px 12px;
  margin: 0 0 22px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
}

.qsd-hero__eyebrow::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--qsd-cyan), var(--qsd-amber));
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.30);
}

.qsd-hero__title {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 4.8vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  font-weight: 800;
}

/* 高亮词 · 青霜湖光 → 金穗琥珀（冷暖反相） */
.qsd-hero__title em {
  font-style: normal;
  background: linear-gradient(95deg, #fcd34d 0%, #a5b4fc 28%, #fcd34d 76%, #ffffff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.qsd-hero__lead {
  margin: 0 0 32px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.08rem;
  max-width: 560px;
  line-height: 1.7;
}

.qsd-hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.qsd-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.qsd-hero__chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--qsd-pill);
  padding: 8px 14px;
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(4px);
}

.qsd-hero__chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--qsd-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.30);
}

/* hero 右侧实时面板 · 毛玻璃 + 钴蓝→青霜→金穗渐变描边 */
.qsd-hero__widget {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  border-radius: var(--qsd-radius);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.qsd-hero__widget::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg,
    rgba(79, 70, 229, 0.55) 0%,
    rgba(20, 184, 166, 0.60) 50%,
    rgba(245, 158, 11, 0.55) 100%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.qsd-hero__widget h2 {
  margin: 0 0 18px;
  font-size: 1.08rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.qsd-hero__widget h2::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--qsd-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.34);
  animation: qmPulse 1.8s ease-in-out infinite;
}

@keyframes qmPulse {
  0%, 100% { transform: scale(1);    opacity: 1;    }
  50%      { transform: scale(1.35); opacity: 0.55; }
}

.qsd-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.qsd-metric {
  border-radius: var(--qsd-radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 14px 16px;
}

.qsd-metric small {
  display: block;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.qsd-metric strong {
  display: block;
  font-size: 1.32rem;
  color: #fff;
  font-weight: 800;
}

/* =============================================================================
 * 06 · Trust strip / 信任 KPI 条
 * ============================================================================= */

.qsd-stats-strip { padding: 40px 0 16px; }

.qsd-stats-strip__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.qsd-stat-tile {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 22px 22px;
  text-align: center;
  box-shadow: var(--qsd-shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--qsd-tx-sm), box-shadow var(--qsd-tx-sm);
}

/* 悬停下方升起一根 钴蓝→青霜→金穗 三段渐变线 */
.qsd-stat-tile::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  height: 3px;
  width: 0;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(90deg, var(--qsd-primary), var(--qsd-cyan), var(--qsd-amber));
  transition: width var(--qsd-tx-md), left var(--qsd-tx-md);
}

.qsd-stat-tile:hover {
  transform: translateY(-3px);
  box-shadow: var(--qsd-shadow);
}

.qsd-stat-tile:hover::after {
  width: 70%;
  left: 15%;
}

.qsd-stat-tile strong {
  display: block;
  font-size: 1.45rem;
  color: var(--qsd-ink);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.qsd-stat-tile span {
  color: var(--qsd-text-soft);
  font-size: 0.88rem;
}

/* =============================================================================
 * 07 · Card grids（功能 / 场景 / 帮助 / FAQ / 博客）
 * ============================================================================= */

.qsd-card-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.qsd-cap-card,
.qsd-download-card,
.qsd-plan-card,
.qsd-faq-item,
.qsd-blog-card,
.qsd-help-card {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  box-shadow: var(--qsd-shadow-xs);
  transition: transform var(--qsd-tx-md), border-color var(--qsd-tx-xs),
              box-shadow var(--qsd-tx-md);
}

.qsd-cap-card {
  padding: 28px 26px;
  position: relative;
  overflow: hidden;
}

/* 卡片 hover 左侧探出 3px 钴蓝→青霜→金穗渐变线 */
.qsd-cap-card::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--qsd-primary), var(--qsd-cyan), var(--qsd-amber));
  transform: scaleY(0.2);
  transform-origin: top;
  opacity: 0;
  transition: transform var(--qsd-tx-md), opacity var(--qsd-tx-md);
}

.qsd-cap-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 70, 229, 0.30);
  box-shadow: var(--qsd-shadow);
}

.qsd-cap-card:hover::before {
  transform: scaleY(1);
  opacity: 1;
}

.qsd-cap-card__icon {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-cyan-soft));
  font-size: 1.4rem;
  margin-bottom: 18px;
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.18);
}

.qsd-cap-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--qsd-ink);
}

.qsd-cap-card p {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 0.94rem;
  line-height: 1.65;
}

/* =============================================================================
 * 08 · Plan cards / 订阅套餐 / 计费切换
 * ============================================================================= */

.qsd-billing-switch {
  display: inline-flex;
  align-items: center;
  margin: 0 auto 38px;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-pill);
  padding: 4px;
  gap: 4px;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-billing-switch button {
  border: 0;
  background: transparent;
  border-radius: var(--qsd-pill);
  padding: 9px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--qsd-text-soft);
  cursor: pointer;
  transition: background var(--qsd-tx-xs), color var(--qsd-tx-xs);
}

.qsd-billing-switch button.is-active {
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  color: #fff;
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.32);
}

.qsd-plans {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  align-items: stretch;
}

.qsd-plan-card {
  padding: 30px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.qsd-plan-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qsd-shadow);
  border-color: rgba(79, 70, 229, 0.30);
}

.qsd-plan-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.qsd-plan-card h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--qsd-ink);
}

.qsd-plan-card__note {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 0.92rem;
  min-height: 38px;
}

.qsd-plan-card__price {
  margin: 6px 0 14px;
  font-weight: 800;
  font-size: 2.05rem;
  color: var(--qsd-ink);
  letter-spacing: -0.02em;
}

.qsd-plan-card__price span {
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--qsd-text-soft);
  margin-left: 6px;
}

.qsd-plan-card ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  flex: 1;
  display: grid;
  gap: 10px;
}

.qsd-plan-card li {
  position: relative;
  padding-left: 24px;
  font-size: 0.94rem;
  color: var(--qsd-text);
}

.qsd-plan-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-amber-soft));
  border: 1.6px solid var(--qsd-primary);
}

.qsd-plan-card li::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 9px;
  width: 6px;
  height: 3px;
  border-left: 1.6px solid var(--qsd-primary);
  border-bottom: 1.6px solid var(--qsd-primary);
  transform: rotate(-45deg);
}

.qsd-plan-card .qsd-btn {
  width: 100%;
}

.qsd-plan-badge {
  display: inline-flex;
  align-items: center;
  background: var(--qsd-bg-alt);
  color: var(--qsd-text-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--qsd-pill);
  text-transform: uppercase;
}

.qsd-plan-badge--accent {
  background: linear-gradient(135deg, var(--qsd-cyan), var(--qsd-primary));
  color: #fff;
  box-shadow: 0 4px 10px rgba(20, 184, 166, 0.30);
}

/* 推荐套餐 · 渐变描边 + ribbon */
.qsd-plan-card--featured {
  border-color: transparent;
  background:
    linear-gradient(var(--qsd-surface), var(--qsd-surface)) padding-box,
    linear-gradient(140deg, var(--qsd-primary), var(--qsd-cyan) 60%, var(--qsd-amber)) border-box;
  border-width: 2px;
  border-style: solid;
  box-shadow: 0 18px 38px rgba(79, 70, 229, 0.22);
}

.qsd-plan-card--featured::after {
  content: attr(data-ribbon);
  position: absolute;
  top: -14px;
  right: 22px;
  background: linear-gradient(135deg, var(--qsd-cyan), var(--qsd-primary));
  color: #fff;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border-radius: var(--qsd-pill);
  box-shadow: 0 6px 14px rgba(20, 184, 166, 0.34);
}

/* =============================================================================
 * 09 · Comparison table
 * ============================================================================= */

.qsd-compare-wrap {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  overflow: hidden;
  box-shadow: var(--qsd-shadow-sm);
  overflow-x: auto;
}

.qsd-compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.qsd-compare-table thead {
  background: linear-gradient(180deg, var(--qsd-primary-soft), transparent);
}

.qsd-compare-table th,
.qsd-compare-table td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid var(--qsd-border);
  vertical-align: top;
}

.qsd-compare-table thead th {
  font-weight: 700;
  color: var(--qsd-ink);
  font-size: 0.95rem;
}

.qsd-compare-table tbody th {
  font-weight: 600;
  color: var(--qsd-ink);
  background: var(--qsd-surface-soft);
  width: 30%;
}

.qsd-compare-table tbody tr:last-child th,
.qsd-compare-table tbody tr:last-child td {
  border-bottom: 0;
}

/* =============================================================================
 * 10 · Download cards
 * ============================================================================= */

.qsd-download-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.qsd-download-card {
  padding: 22px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--qsd-text);
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.qsd-download-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg,
    rgba(79, 70, 229, 0) 0%,
    rgba(20, 184, 166, 0) 50%,
    rgba(245, 158, 11, 0) 100%);
  z-index: -1;
  transition: background var(--qsd-tx-md);
}

.qsd-download-card:hover {
  transform: translateY(-3px);
  border-color: rgba(79, 70, 229, 0.35);
  box-shadow: var(--qsd-shadow);
}

.qsd-download-card:hover::before {
  background: linear-gradient(135deg,
    rgba(79, 70, 229, 0.07) 0%,
    rgba(20, 184, 166, 0.05) 50%,
    rgba(245, 158, 11, 0.07) 100%);
}

.qsd-download-card__platform {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--qsd-ink);
}

.qsd-download-card__hint {
  color: var(--qsd-text-soft);
  font-size: 0.86rem;
}

/* =============================================================================
 * 11 · Testimonials carousel
 * ============================================================================= */

.qsd-testimonials {
  position: relative;
  overflow: hidden;
  padding: 4px;
}

.qsd-testimonials__track {
  display: flex;
  gap: 22px;
  transition: transform var(--qsd-tx-md);
}

.qsd-testimonial-card {
  flex: 0 0 calc((100% - 44px) / 3);
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 26px 24px;
  box-shadow: var(--qsd-shadow-xs);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qsd-testimonial-card p {
  margin: 0;
  color: var(--qsd-text);
  line-height: 1.7;
  font-size: 0.96rem;
}

.qsd-testimonial-card strong {
  color: var(--qsd-text-soft);
  font-weight: 600;
  font-size: 0.86rem;
}

.qsd-carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 22px;
}

.qsd-carousel-arrow {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-carousel-arrow:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

.qsd-carousel-dots {
  display: flex;
  gap: 8px;
}

.qsd-carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: var(--qsd-border-strong);
  cursor: pointer;
  transition: background var(--qsd-tx-xs), transform var(--qsd-tx-xs);
}

.qsd-carousel-dot.is-active {
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  transform: scale(1.25);
}

/* =============================================================================
 * 12 · Step list（5-step quickstart）
 * ============================================================================= */

.qsd-step-list {
  list-style: none;
  padding: 0;
}

.qsd-step-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 18px 22px;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.34);
}

.qsd-step-list strong {
  color: var(--qsd-ink);
}

/* =============================================================================
 * 13 · FAQ accordion
 * ============================================================================= */

.qsd-faq {
  display: grid;
  gap: 14px;
  max-width: 880px;
  margin: 0 auto;
}

.qsd-faq-item {
  padding: 0;
  overflow: hidden;
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs);
}

.qsd-faq-item.is-open {
  border-color: rgba(79, 70, 229, 0.32);
  box-shadow: var(--qsd-shadow-sm);
}

.qsd-faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  padding: 20px 22px;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--qsd-ink);
  transition: color var(--qsd-tx-xs);
}

.qsd-faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--qsd-primary);
  transition: transform var(--qsd-tx-sm);
}

.qsd-faq-item.is-open .qsd-faq-question {
  color: var(--qsd-primary-strong);
}

.qsd-faq-item.is-open .qsd-faq-question::after {
  transform: rotate(45deg);
}

.qsd-faq-answer {
  padding: 0 22px 22px;
  color: var(--qsd-text-soft);
  line-height: 1.7;
  font-size: 0.96rem;
}

.qsd-faq-answer p { margin: 0; }

/* =============================================================================
 * 14 · Blog cards
 * ============================================================================= */

.qsd-blog-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qsd-blog-archive {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 40px;
}

.qsd-blog-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.qsd-blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qsd-shadow);
  border-color: rgba(79, 70, 229, 0.30);
}

.qsd-blog-card__thumb {
  display: block;
  aspect-ratio: 16 / 9;
  background: var(--qsd-bg-alt);
  overflow: hidden;
}

.qsd-blog-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--qsd-tx-md);
}

.qsd-blog-card:hover .qsd-blog-card__thumb img {
  transform: scale(1.04);
}

.qsd-blog-card__body {
  padding: 22px 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.qsd-blog-card__meta {
  margin: 0;
  font-size: 0.82rem;
  color: var(--qsd-text-faint);
}

.qsd-blog-card__title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.45;
}

.qsd-blog-card__title a {
  color: var(--qsd-ink);
  transition: color var(--qsd-tx-xs);
}

.qsd-blog-card__title a:hover {
  color: var(--qsd-primary-strong);
}

.qsd-blog-card__excerpt {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 0.92rem;
  line-height: 1.65;
  flex: 1;
}

.qsd-blog-card__link {
  margin-top: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--qsd-primary);
  align-self: flex-start;
  transition: color var(--qsd-tx-xs);
}

.qsd-blog-card__link:hover { color: var(--qsd-cyan-strong); }

/* =============================================================================
 * 15 · Tag cloud
 * ============================================================================= */

.qsd-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.qsd-tag-cloud a {
  display: inline-flex;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  color: var(--qsd-text);
  padding: 7px 14px;
  border-radius: var(--qsd-pill);
  font-size: 0.88rem;
  transition: background var(--qsd-tx-xs), color var(--qsd-tx-xs),
              border-color var(--qsd-tx-xs);
}

.qsd-tag-cloud a:hover {
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-cyan-soft));
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

/* =============================================================================
 * 16 · CTA strip
 * ============================================================================= */

.qsd-cta-strip {
  background: var(--qsd-hero-grad);
  border-radius: var(--qsd-radius-xl);
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--qsd-shadow-lg);
}

.qsd-cta-strip::after {
  content: "";
  position: absolute;
  width: 480px;
  height: 480px;
  right: -120px;
  top: -160px;
  border-radius: 50%;
  background: var(--qsd-tide-cyan);
  pointer-events: none;
}

.qsd-cta-strip > * { position: relative; z-index: 1; }

.qsd-cta-strip h2 {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: -0.01em;
}

.qsd-cta-strip p {
  margin: 0;
  color: rgba(255, 255, 255, 0.84);
}

.qsd-cta-strip__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* =============================================================================
 * 17 · Footer
 * ============================================================================= */

.qsd-footer {
  margin-top: 80px;
  background: linear-gradient(180deg, transparent, rgba(79, 70, 229, 0.04));
  border-top: 1px solid var(--qsd-border);
  padding: 60px 0 28px;
  color: var(--qsd-text-soft);
}

.qsd-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--qsd-border);
}

.qsd-footer__col--brand { min-width: 0; }

.qsd-footer__contact-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 6px;
  font-size: 0.88rem;
  line-height: 1.55;
}

.qsd-footer__contact-list li {
  display: grid;
  grid-template-columns: minmax(110px, 140px) 1fr;
  gap: 8px;
  align-items: baseline;
}

.qsd-footer__contact-label {
  color: var(--qsd-text-faint);
  letter-spacing: 0.02em;
  font-size: 0.78rem;
  text-transform: uppercase;
  font-weight: 600;
}

.qsd-footer__contact-list a {
  color: var(--qsd-primary-strong);
  word-break: break-word;
  border-bottom: 1px dashed transparent;
  transition: color var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-footer__contact-list a:hover {
  color: var(--qsd-cyan-strong);
  border-bottom-color: var(--qsd-cyan);
}

/* —— v10 信任徽章带（顶置 · ISO / SOC 2 / CSA STAR） —— */
.qsd-footer__trust {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 0 0 26px;
  border-bottom: 1px dashed var(--qsd-border);
  margin-bottom: 26px;
}

.qsd-footer__trust-label {
  color: var(--qsd-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 700;
}

.qsd-footer__trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.qsd-footer__trust-item {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: var(--qsd-pill);
  background: var(--qsd-cyan-soft);
  color: var(--qsd-cyan-strong);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  border: 1px solid rgba(20, 184, 166, 0.18);
}

/* —— 社交矩阵条 —— */
.qsd-footer__social {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  font-size: 0.92rem;
  padding: 22px 0 0;
}

.qsd-footer__social-label {
  color: var(--qsd-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 700;
}

.qsd-footer__social a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--qsd-pill);
  background: var(--qsd-primary-soft);
  color: var(--qsd-primary-strong);
  font-weight: 600;
  font-size: 0.84rem;
  border: 1px solid transparent;
  transition: background var(--qsd-tx-xs),
              border-color var(--qsd-tx-xs),
              transform var(--qsd-tx-xs);
}

.qsd-footer__social a:hover {
  background: #fff;
  border-color: var(--qsd-primary);
  transform: translateY(-1px);
}

.qsd-footer h4 {
  margin: 0 0 16px;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--qsd-ink);
}

.qsd-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.qsd-footer ul a {
  color: var(--qsd-text-soft);
  font-size: 0.92rem;
  transition: color var(--qsd-tx-xs);
}

.qsd-footer ul a:hover { color: var(--qsd-primary-strong); }

.qsd-footer__brand-text {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 360px;
}

.qsd-footer__brand-text a { color: var(--qsd-primary-strong); }

.qsd-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--qsd-text-faint);
  padding-top: 24px;
}

.qsd-footer__friends {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.qsd-footer__friends a {
  color: var(--qsd-primary);
  transition: color var(--qsd-tx-xs);
}

.qsd-footer__friends a:hover { color: var(--qsd-cyan-strong); }

/* =============================================================================
 * 18 · Page banner（用于 blog / help / privacy / terms / about / contact）
 * ============================================================================= */

.qsd-page-banner {
  position: relative;
  padding: 96px 0 60px;
  background:
    radial-gradient(ellipse 80% 60% at 80% 10%, rgba(20, 184, 166, 0.20), transparent 55%),
    radial-gradient(ellipse 60% 50% at 12% 90%, rgba(245, 158, 11, 0.15), transparent 55%),
    linear-gradient(180deg, rgba(79, 70, 229, 0.08), transparent 100%);
  border-bottom: 1px solid var(--qsd-border);
  text-align: center;
  overflow: hidden;
}

.qsd-page-banner h1 {
  margin: 8px auto 14px;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  color: var(--qsd-ink);
  max-width: 880px;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.qsd-page-banner p {
  margin: 0 auto;
  max-width: 720px;
  color: var(--qsd-text-soft);
  font-size: 1rem;
}

.qsd-page-body {
  padding: 60px 0 96px;
}

/* =============================================================================
 * 19 · Breadcrumb
 * ============================================================================= */

.qsd-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--qsd-text-soft);
  margin-bottom: 28px;
}

.qsd-breadcrumb a {
  color: var(--qsd-text-soft);
  transition: color var(--qsd-tx-xs);
}

.qsd-breadcrumb a:hover { color: var(--qsd-primary-strong); }

.qsd-breadcrumb__sep { color: var(--qsd-text-faint); }

.qsd-breadcrumb [aria-current="page"] {
  color: var(--qsd-ink);
  font-weight: 600;
}

/* =============================================================================
 * 20 · Single post
 * ============================================================================= */

.qsd-single { padding: 48px 0 96px; }

.qsd-post-header { margin-bottom: 28px; }

.qsd-post-title {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  color: var(--qsd-ink);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.qsd-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--qsd-text-soft);
}

.qsd-post-meta a {
  color: var(--qsd-primary);
  transition: color var(--qsd-tx-xs);
}

.qsd-post-meta a:hover { color: var(--qsd-cyan-strong); }

.qsd-post-meta__sep { color: var(--qsd-text-faint); }

.qsd-read-time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--qsd-primary-soft);
  color: var(--qsd-primary-strong);
  padding: 4px 10px;
  border-radius: var(--qsd-pill);
  font-size: 0.78rem;
  font-weight: 600;
}

.qsd-read-time::before {
  content: "⌛";
  font-size: 0.86rem;
}

/* TL;DR 摘要框 */
.qsd-tldr {
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-cyan-soft));
  border-left: 4px solid var(--qsd-primary);
  border-radius: var(--qsd-radius-sm);
  padding: 16px 20px;
  margin: 0 0 28px;
  color: var(--qsd-ink-soft);
  line-height: 1.7;
  font-size: 0.96rem;
}

.qsd-tldr strong { color: var(--qsd-primary-strong); }

.qsd-post-thumbnail {
  margin: 0 0 28px;
  border-radius: var(--qsd-radius);
  overflow: hidden;
  box-shadow: var(--qsd-shadow-sm);
}

.qsd-post-featured-image {
  width: 100%;
  height: auto;
  display: block;
}

/* TOC 自动目录 */
.qsd-toc {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-left: 4px solid var(--qsd-primary);
  border-radius: var(--qsd-radius-sm);
  padding: 18px 22px;
  margin: 0 0 32px;
  font-size: 0.94rem;
}

.qsd-toc strong {
  display: block;
  margin-bottom: 10px;
  color: var(--qsd-ink);
  font-size: 0.95rem;
}

.qsd-toc ol {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 6px;
}

.qsd-toc a {
  color: var(--qsd-text-soft);
  transition: color var(--qsd-tx-xs);
}

.qsd-toc a:hover { color: var(--qsd-primary-strong); }

/* Prose */
.qsd-prose,
.qsd-post-content {
  color: var(--qsd-text);
  line-height: 1.8;
  font-size: 1rem;
  max-width: 760px;
  margin: 0 auto;
}

.qsd-prose h2,
.qsd-post-content h2 {
  margin: 40px 0 14px;
  color: var(--qsd-ink);
  font-size: 1.4rem;
  letter-spacing: -0.005em;
  scroll-margin-top: 90px;
}

.qsd-prose h3,
.qsd-post-content h3 {
  margin: 28px 0 10px;
  color: var(--qsd-ink);
  font-size: 1.16rem;
  scroll-margin-top: 90px;
}

.qsd-prose p,
.qsd-post-content p {
  margin: 0 0 16px;
}

.qsd-prose ul,
.qsd-prose ol,
.qsd-post-content ul,
.qsd-post-content ol {
  padding-left: 22px;
  margin: 0 0 18px;
}

.qsd-prose li,
.qsd-post-content li { margin: 6px 0; }

.qsd-prose code,
.qsd-post-content code {
  font-family: var(--qsd-font-mono);
  background: var(--qsd-bg-alt);
  border: 1px solid var(--qsd-border);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.9em;
  color: var(--qsd-cyan-strong);
}

.qsd-prose blockquote,
.qsd-post-content blockquote {
  margin: 22px 0;
  padding: 14px 22px;
  border-left: 4px solid var(--qsd-cyan);
  background: linear-gradient(90deg, var(--qsd-cyan-soft), transparent 80%);
  color: var(--qsd-text);
  font-style: italic;
  border-radius: 0 var(--qsd-radius-sm) var(--qsd-radius-sm) 0;
}

.qsd-prose__callout {
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-amber-soft));
  border: 1px solid rgba(79, 70, 229, 0.18);
  border-radius: var(--qsd-radius);
  padding: 18px 22px;
  margin: 0 0 30px;
  color: var(--qsd-ink-soft);
  font-size: 0.97rem;
  line-height: 1.7;
}

.qsd-bullets {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 8px;
}

.qsd-bullets > li {
  position: relative;
  padding-left: 22px;
}

.qsd-bullets > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
}

/* Author bio · E-E-A-T */
.qsd-author-bio {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 22px 24px;
  margin: 40px 0 0;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-author-bio__mark {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.4rem;
  flex-shrink: 0;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.34);
}

.qsd-author-bio__body { flex: 1; }

.qsd-author-bio__name {
  display: block;
  color: var(--qsd-ink);
  font-size: 1rem;
}

.qsd-author-bio__role {
  color: var(--qsd-primary-strong);
  font-size: 0.84rem;
  margin-left: 8px;
}

.qsd-author-bio__desc {
  margin: 8px 0 0;
  color: var(--qsd-text-soft);
  font-size: 0.94rem;
  line-height: 1.7;
}

/* Related posts */
.qsd-related {
  margin: 40px 0 0;
}

.qsd-related h2 {
  margin: 0 0 16px;
  color: var(--qsd-ink);
  font-size: 1.2rem;
}

.qsd-related__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qsd-related__item {
  display: block;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius-sm);
  padding: 16px 18px;
  color: var(--qsd-ink);
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs),
              transform var(--qsd-tx-xs);
  font-weight: 600;
  line-height: 1.5;
  font-size: 0.94rem;
}

.qsd-related__item small {
  display: block;
  color: var(--qsd-text-faint);
  font-size: 0.78rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.qsd-related__item:hover {
  border-color: rgba(79, 70, 229, 0.32);
  box-shadow: var(--qsd-shadow-sm);
  transform: translateY(-2px);
}

/* Post navigation · prev / next */
.qsd-post-nav {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr 1fr;
  margin-top: 48px;
}

.qsd-post-nav__prev,
.qsd-post-nav__next {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 16px 20px;
  color: var(--qsd-ink);
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs);
}

.qsd-post-nav__next { text-align: right; }

.qsd-post-nav__prev:hover,
.qsd-post-nav__next:hover {
  border-color: rgba(79, 70, 229, 0.32);
  box-shadow: var(--qsd-shadow-sm);
}

.qsd-post-nav__label {
  display: block;
  font-size: 0.78rem;
  color: var(--qsd-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.qsd-post-nav__title {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
}

.qsd-post-pages {
  margin: 24px 0 0;
  font-size: 0.92rem;
  color: var(--qsd-text-soft);
}

.qsd-post-pages a {
  display: inline-block;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  padding: 4px 10px;
  border-radius: var(--qsd-radius-sm);
  margin: 0 4px;
  color: var(--qsd-text);
}

/* =============================================================================
 * 21 · Help center grid
 * ============================================================================= */

.qsd-help-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 50px;
}

.qsd-help-card {
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qsd-help-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--qsd-shadow);
  border-color: rgba(79, 70, 229, 0.30);
}

.qsd-help-card__icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-amber-soft));
  font-size: 1.2rem;
}

.qsd-help-card__links {
  list-style: none;
  padding: 0;
  margin: 6px 0 0;
  display: grid;
  gap: 6px;
}

.qsd-help-card__links a {
  color: var(--qsd-text-soft);
  font-size: 0.9rem;
  transition: color var(--qsd-tx-xs);
}

.qsd-help-card__links a:hover { color: var(--qsd-primary-strong); }

.qsd-help-section {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 28px 32px;
  margin: 0 0 24px;
  box-shadow: var(--qsd-shadow-xs);
  scroll-margin-top: 90px;
}

.qsd-help-section h2 {
  margin: 0 0 14px;
  color: var(--qsd-ink);
  font-size: 1.3rem;
  letter-spacing: -0.005em;
}

.qsd-help-section h3 {
  margin: 24px 0 10px;
  color: var(--qsd-ink);
  font-size: 1.05rem;
  scroll-margin-top: 90px;
}

.qsd-help-section p {
  margin: 0 0 14px;
  color: var(--qsd-text);
  line-height: 1.75;
}

.qsd-help-section ul {
  margin: 0 0 16px;
  padding-left: 22px;
  color: var(--qsd-text);
}

.qsd-help-section li { margin: 6px 0; }

.qsd-help-section code {
  font-family: var(--qsd-font-mono);
  background: var(--qsd-bg-alt);
  border: 1px solid var(--qsd-border);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.9em;
  color: var(--qsd-cyan-strong);
}

/* —— Contact 表单 + 联系信息块 —— */
.qsd-contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: start;
}

.qsd-contact-card {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 26px 28px;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-contact-card h3 {
  margin: 0 0 10px;
  color: var(--qsd-ink);
}

.qsd-contact-card p,
.qsd-contact-card a {
  color: var(--qsd-text);
}

.qsd-contact-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.qsd-contact-card ul li::before {
  content: "›";
  color: var(--qsd-primary);
  margin-right: 8px;
  font-weight: 700;
}

/* =============================================================================
 * 22 · Pagination
 * ============================================================================= */

.qsd-pagination {
  display: flex;
  justify-content: center;
  margin: 36px 0;
}

.qsd-pagination ul {
  list-style: none;
  display: flex;
  gap: 8px;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  justify-content: center;
}

.qsd-pagination a,
.qsd-pagination span {
  display: inline-grid;
  place-items: center;
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  border-radius: var(--qsd-radius-sm);
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  font-weight: 600;
  font-size: 0.92rem;
  transition: background var(--qsd-tx-xs), color var(--qsd-tx-xs),
              border-color var(--qsd-tx-xs);
}

.qsd-pagination a:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

.qsd-pagination .current {
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  color: #fff;
  border-color: transparent;
}

/* =============================================================================
 * 23 · Responsive
 * ============================================================================= */

@media (max-width: 1024px) {
  .qsd-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-plans { grid-template-columns: 1fr; }
  .qsd-download-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .qsd-blog-grid,
  .qsd-blog-archive { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-help-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-related__grid { grid-template-columns: 1fr; }
  .qsd-footer__inner {
    grid-template-columns: 1.4fr 1fr 1fr;
    grid-auto-rows: minmax(0, auto);
  }
  .qsd-footer__col--brand { grid-column: 1 / -1; }
  .qsd-hero__grid { grid-template-columns: 1fr; }
  .qsd-hero__panel { padding: 56px 36px; }
  .qsd-stats-strip__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-testimonial-card { flex: 0 0 calc((100% - 22px) / 2); }
  .qsd-contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .qsd-section { padding: 64px 0; }
  .qsd-card-grid { grid-template-columns: 1fr; }
  .qsd-download-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-blog-grid,
  .qsd-blog-archive,
  .qsd-help-grid { grid-template-columns: 1fr; }
  .qsd-footer__inner { grid-template-columns: 1fr; }
  .qsd-footer__col--brand { grid-column: auto; }
  .qsd-footer__contact-list li { grid-template-columns: 1fr; gap: 2px; }
  .qsd-nav { display: none; }
  .qsd-menu-toggle { display: inline-flex; }
  .qsd-hero__panel { padding: 44px 24px; }
  .qsd-hero__title { font-size: clamp(1.7rem, 7vw, 2.2rem); }
  .qsd-cta-strip { padding: 38px 28px; flex-direction: column; align-items: flex-start; }
  .qsd-testimonial-card { flex: 0 0 100%; }
  .qsd-post-nav { grid-template-columns: 1fr; }
  .qsd-help-section { padding: 22px 20px; }
}

@media (max-width: 480px) {
  .qsd-stats-strip__grid { grid-template-columns: 1fr; }
  .qsd-billing-switch { width: 100%; }
  .qsd-billing-switch button { flex: 1; }
}

/* =============================================================================
 * 24 · Reveal-on-scroll
 * ============================================================================= */

[data-qsd-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--qsd-ease-out), transform 0.7s var(--qsd-ease-out);
}

[data-qsd-reveal].is-shown {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  [data-qsd-reveal] { opacity: 1; transform: none; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* =============================================================================
 * 25 · Print stylesheet
 * ============================================================================= */

@media print {
  .qsd-header,
  .qsd-footer,
  .qsd-mobile-overlay,
  .qsd-mobile-panel,
  .qsd-cta-strip,
  .qsd-related,
  .qsd-post-nav,
  .qsd-tag-cloud,
  .qsd-skip,
  [data-qsd-reveal] { display: none !important; opacity: 1 !important; }

  body { background: #fff !important; color: #000 !important; }
  .qsd-prose, .qsd-post-content { max-width: none !important; }
  a { color: inherit !important; text-decoration: underline !important; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.85em; color: #555; }
}

/* =============================================================================
 * 26 · Legacy shims — 兼容旧 qb-* / qp-* 类名（保护既有插件 / 编辑器内容）
 * 仅为视觉兜底；新增内容应一律使用 qsd-* 命名空间。
 * ============================================================================= */

.qb-shell, .qp-shell           { min-height: 100vh; display: flex; flex-direction: column; overflow-x: clip; }
.qb-container, .qp-container   { width: min(92%, var(--qsd-container)); margin-inline: auto; }
.qb-main, .qp-main             { flex: 1; }
.qb-section, .qp-section       { padding: 96px 0; }
.qb-prose,  .qp-prose,
.qb-post-content,
.qp-post-content               { color: var(--qsd-text); line-height: 1.8; }
.qb-footer, .qp-footer         { margin-top: 80px; padding: 60px 0 28px; }

/* =============================================================================
 * 27 · Stellar DriftRoute 协议徽章 / 星轨光痕装饰（v15 重塑 · 星宇航迹专属组件）
 * ---------------------------------------------------------------------------
 * 用法：
 *   <span class="qsd-wing-badge">Stellar DriftRoute</span>
 *   <div class="qsd-trail-deco" aria-hidden="true"></div>
 * 设计意图：在文章 / 卡片中加入"双层椭圆星轨光痕"装饰，呼应 Logo 的北极星 + 椭圆星轨母题。
 * ============================================================================= */

.qsd-wing-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 8px;
  border-radius: var(--qsd-pill);
  background: linear-gradient(95deg,
              var(--qsd-primary-soft) 0%,
              #ffffff 100%);
  color: var(--qsd-primary-strong);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid rgba(79, 70, 229, 0.22);
  line-height: 1;
}

.qsd-wing-badge::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 30% 30%, #fcd34d 0%, transparent 60%),
    radial-gradient(circle at 70% 70%, #fcd34d 0%, transparent 60%),
    var(--qsd-primary);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.20);
}

.qsd-trail-deco {
  position: relative;
  height: 1px;
  width: 100%;
  margin: 24px 0;
  background: linear-gradient(90deg,
              transparent 0%,
              var(--qsd-primary) 18%,
              var(--qsd-cyan) 50%,
              var(--qsd-amber) 82%,
              transparent 100%);
  opacity: 0.45;
}

.qsd-trail-deco::before,
.qsd-trail-deco::after {
  content: "";
  position: absolute;
  top: -3px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
}

.qsd-trail-deco::before {
  left: 18%;
  background: var(--qsd-primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.18);
}

.qsd-trail-deco::after {
  right: 18%;
  background: var(--qsd-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.20);
}

/* =============================================================================
 * 00 · Stellar Drift — design tokens（v15.0 副本 · Stellar）
 * ---------------------------------------------------------------------------
 * 本节为主题代号 / 设计意图段的"双写副本"，仅在 CSS 解析器吞掉首段注释（极少数旧
 * 浏览器、minifier 行为）时充当兜底说明。内容与文件头部一致，详见首段。
 * ============================================================================= */

:root {
  /* —— surfaces · 晨穹薄靛 + 渊际墨靛 —— */
  --qsd-bg:           #eef2ff;   /* 画布底：晨穹薄靛（indigo-50） */
  --qsd-bg-alt:       #e0e7ff;   /* 区块交替：穹宇微靛（indigo-100） */
  --qsd-surface:      #ffffff;   /* 卡片底 */
  --qsd-surface-soft: #f0fdfa;   /* 弱卡片 / 行高亮：星霜薄青（teal-50） */
  --qsd-surface-deep: #312e81;   /* 渊际穹深（indigo-900），反白底用 */

  /* —— ink / typography · 渊际星墨族（v15 继续沿用 slate-900，与新靛蓝主轴更冷协调） —— */
  --qsd-ink:        #0f172a;     /* 主标题墨：渊际星墨（slate-900） */
  --qsd-ink-soft:   #312e81;     /* 副标题：渊际穹深（indigo-900） */
  --qsd-text:       #3730a3;     /* 正文：穹宇墨蓝（indigo-800） */
  --qsd-text-soft:  #475569;     /* 辅助文字：星雾灰（slate-600） */
  --qsd-text-faint: #94a3b8;     /* 标签 / 占位：远星灰（slate-400） */

  /* —— brand · 靛宇钴蓝主轴（保留蓝色基调，色相由 200° 旋转到 243°） —— */
  --qsd-primary:        #4f46e5; /* 靛宇钴蓝（indigo-600，主） */
  --qsd-primary-strong: #4338ca; /* 穹宇靛蓝（indigo-700） */
  --qsd-primary-soft:   #e0e7ff; /* 主轴浅底：穹宇微靛（indigo-100） */
  --qsd-primary-deep:   #1e1b4b; /* 主轴最深：渊际墨靛（indigo-950） */
  --qsd-secondary:      #312e81; /* 渊际穹深辅色（indigo-900） · 用于次级 CTA / 标签 */
  --qsd-azure:          #818cf8; /* 高亮夜穹（indigo-400，hero 反白氛围） */

  /* —— accent · 青霜湖光（冷对位 · v15 关键差异：紫罗暮霭→青霜湖光） —— */
  --qsd-cyan:           #14b8a6; /* 青霜湖光（teal-500，变量名沿用 cyan 仅为兼容旧选择器） */
  --qsd-cyan-strong:    #0f766e; /* 青霜深（teal-700） */
  --qsd-cyan-soft:      #ccfbf1; /* 青霜浅（teal-100） */

  /* —— accent · 金穗琥珀（暖对位 · v15 关键差异：玫珊朝阳→金穗琥珀） —— */
  --qsd-amber:          #f59e0b; /* 金穗琥珀（amber-500） */
  --qsd-amber-strong:   #b45309; /* 金穗深（amber-700） */
  --qsd-amber-soft:     #fef3c7; /* 金穗浅（amber-100） */

  /* —— signal · 语义色（v15 与冷辅 teal / 暖辅 amber 显式区隔，避免视觉撞色） —— */
  --qsd-success: #059669;        /* emerald-600 · 星苗翠绿（避开冷辅 teal 同族） */
  --qsd-warn:    #ea580c;        /* orange-600 · 警示橙 */
  --qsd-danger:  #dc2626;        /* red-600 · 紧急猩红（避开暖辅 amber 同族） */

  /* —— borders & shadows · 穹宇雾靛阴影族（v15 由渊际星墨 → 渊际墨靛） —— */
  --qsd-border:        #c7d2fe;  /* indigo-200 · 穹宇雾靛线 */
  --qsd-border-strong: #818cf8;  /* indigo-400 · 强调线 */
  --qsd-shadow-xs: 0 1px 2px rgba(30, 27, 75, 0.06);
  --qsd-shadow-sm: 0 2px 14px rgba(30, 27, 75, 0.10);
  --qsd-shadow:    0 18px 44px rgba(30, 27, 75, 0.16);
  --qsd-shadow-lg: 0 36px 80px rgba(15, 23, 42, 0.30);
  --qsd-glow:      0 0 0 6px rgba(79, 70, 229, 0.16),
                  0 14px 32px rgba(20, 184, 166, 0.30);
  --qsd-glow-amber: 0 0 0 6px rgba(79, 70, 229, 0.14),
                   0 14px 32px rgba(245, 158, 11, 0.34);

  /* —— hero · 星宇航迹北极星双晕渐变（v15：左下金穗琥珀晕 · 右上青霜湖光晕） —— */
  --qsd-hero-grad:
    radial-gradient(ellipse 70% 78% at 86% 14%, rgba(20, 184, 166, 0.40), transparent 56%),
    radial-gradient(circle  at 12% 86%, rgba(245, 158, 11, 0.30), transparent 58%),
    linear-gradient(158deg, #1e1b4b 0%, #312e81 24%, #3730a3 50%, #4f46e5 80%, #818cf8 100%);
  --qsd-tide-cyan:  radial-gradient(circle, rgba(20, 184, 166, 0.55), transparent 65%);
  --qsd-tide-amber: radial-gradient(circle, rgba(245, 158, 11, 0.55), transparent 65%);

  /* —— radius scale —— */
  --qsd-radius-xs: 8px;
  --qsd-radius-sm: 12px;
  --qsd-radius:    18px;
  --qsd-radius-lg: 26px;
  --qsd-radius-xl: 36px;
  --qsd-pill:      999px;

  /* —— layout —— */
  --qsd-container: 1180px;
  --qsd-gutter:    24px;

  /* —— motion —— */
  --qsd-ease:     cubic-bezier(0.32, 0.72, 0, 1);
  --qsd-ease-out: cubic-bezier(0.2, 0.9, 0.3, 1);
  --qsd-tx-xs:    0.18s var(--qsd-ease);
  --qsd-tx-sm:    0.26s var(--qsd-ease);
  --qsd-tx-md:    0.42s var(--qsd-ease);
  --qsd-tx-lg:    0.72s var(--qsd-ease-out);

  /* —— typography —— */
  --qsd-font:
    -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", Inter,
    Roboto, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    Helvetica, Arial, sans-serif;
  --qsd-font-mono:
    "JetBrains Mono", "Cascadia Code", ui-monospace, "SFMono-Regular",
    "Roboto Mono", monospace;
}

/* =============================================================================
 * 01 · Reset & base
 * ============================================================================= */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--qsd-font);
  font-size: 16px;
  color: var(--qsd-text);
  background: var(--qsd-bg);
  /* 星宇航迹三轴微光：右上青霜湖光、左上靛宇钴蓝、底部金穗琥珀 */
  background-image:
    radial-gradient(circle at 96% -4%,  rgba(20, 184, 166, 0.10), transparent 42%),
    radial-gradient(circle at 4% 6%,    rgba(79, 70, 229, 0.08), transparent 40%),
    radial-gradient(circle at 50% 108%, rgba(245, 158, 11, 0.10), transparent 50%);
  background-attachment: fixed;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.qsd-no-scroll { overflow: hidden; }

a { color: inherit; text-decoration: none; }
a[role="link"] { cursor: pointer; }

img,
svg { max-width: 100%; display: block; }

button { font-family: inherit; }

::selection {
  background: var(--qsd-cyan);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--qsd-amber);
  outline-offset: 2px;
}

/* =============================================================================
 * 02 · Layout primitives
 * ============================================================================= */

.qsd-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
}

.qsd-container {
  width: min(92%, var(--qsd-container));
  margin-inline: auto;
}

.qsd-main { flex: 1; }

.qsd-section { padding: 96px 0; }
.qsd-section--tight { padding-top: 32px; }
.qsd-section--alt {
  position: relative;
  background:
    linear-gradient(180deg, rgba(79, 70, 229, 0.05), transparent 55%),
    linear-gradient(180deg, rgba(20, 184, 166, 0.05), transparent 85%);
}

.qsd-section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 50px;
}

/* eyebrow · 钴蓝软底 + 青霜星轨渐变线 */
.qsd-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--qsd-primary-strong);
  background: linear-gradient(90deg, var(--qsd-primary-soft), #fff 70%);
  border: 1px solid rgba(79, 70, 229, 0.20);
  border-radius: var(--qsd-pill);
  padding: 7px 16px 7px 10px;
  margin: 0 0 16px;
}

.qsd-eyebrow::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--qsd-primary), var(--qsd-cyan));
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.18);
}

.qsd-section-head h2 {
  margin: 0 0 14px;
  font-size: clamp(1.65rem, 3.2vw, 2.4rem);
  letter-spacing: -0.01em;
  color: var(--qsd-ink);
  line-height: 1.22;
}

.qsd-section-head p {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 1.04rem;
}

/* 渐变文字 · 钴蓝 → 青霜湖光 → 金穗琥珀 */
.qsd-gradient-text {
  background: linear-gradient(95deg, var(--qsd-primary) 12%, var(--qsd-cyan) 55%, var(--qsd-amber));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* —— 屏幕阅读器专用文本 —— */
.qsd-sr {
  position: absolute !important;
  clip: rect(1px, 1px, 1px, 1px);
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
}

/* —— 跳过到主内容 · a11y —— */
.qsd-skip {
  position: absolute;
  top: -40px;
  left: 12px;
  background: var(--qsd-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--qsd-radius-sm);
  z-index: 999;
  transition: top 0.2s var(--qsd-ease);
}

.qsd-skip:focus { top: 12px; }

/* =============================================================================
 * 03 · Header & Navigation
 * ============================================================================= */

.qsd-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(244, 245, 251, 0.80);
  backdrop-filter: blur(18px) saturate(170%);
  -webkit-backdrop-filter: blur(18px) saturate(170%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs),
              background var(--qsd-tx-xs);
}

.qsd-header.is-pinned {
  border-bottom-color: rgba(79, 70, 229, 0.16);
  box-shadow: var(--qsd-shadow-sm);
  background: rgba(255, 255, 255, 0.96);
}

.qsd-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  min-height: 74px;
}

.qsd-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
  color: var(--qsd-ink);
}

/* logo 容器 · 深靛墨水 + 右上青霜湖光 + 左下金穗琥珀朝霞 */
.qsd-brand__mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 12px;
  background: linear-gradient(150deg, #1e1b4b 0%, #1e1b4b 50%, #4338ca 100%);
  padding: 7px;
  display: grid;
  place-items: center;
  box-shadow: 0 8px 22px rgba(79, 70, 229, 0.40);
  position: relative;
  overflow: hidden;
}

.qsd-brand__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.55), transparent 55%),
    radial-gradient(circle at 20% 78%, rgba(245, 158, 11, 0.42), transparent 55%);
  pointer-events: none;
}

.qsd-brand__mark img,
.qsd-brand__mark svg {
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 1;
}

.qsd-brand__name {
  background: linear-gradient(95deg, var(--qsd-ink) 30%, var(--qsd-primary) 65%, var(--qsd-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.qsd-nav { display: flex; }

.qsd-nav ul,
.qsd-mobile-nav ul {
  display: flex;
  gap: 4px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.qsd-nav a {
  display: inline-flex;
  align-items: center;
  color: var(--qsd-text-soft);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 9px 14px;
  border-radius: var(--qsd-radius-sm);
  transition: color var(--qsd-tx-xs), background var(--qsd-tx-xs);
  position: relative;
}

.qsd-nav a:hover,
.qsd-nav a:focus-visible,
.qsd-nav a[aria-current] {
  color: var(--qsd-primary-strong);
  background: var(--qsd-primary-soft);
}

/* 当前页指示：底部 2px 青霜湖光 → 金穗琥珀朝霞渐变线 */
.qsd-nav a[aria-current]::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--qsd-cyan), var(--qsd-amber));
}

.qsd-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.qsd-menu-toggle {
  display: none;
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  border-radius: var(--qsd-radius-sm);
  font-weight: 600;
  padding: 9px 14px;
  cursor: pointer;
  transition: background var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-menu-toggle:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
}

/* —— 移动端抽屉 —— */
.qsd-mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(30, 27, 75, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--qsd-tx-md);
  backdrop-filter: blur(4px);
}

.qsd-mobile-overlay.is-shown {
  opacity: 1;
  pointer-events: auto;
}

.qsd-mobile-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(82vw, 380px);
  height: 100vh;
  z-index: 120;
  background: var(--qsd-surface);
  border-left: 1px solid var(--qsd-border);
  box-shadow: -28px 0 70px rgba(30, 27, 75, 0.3);
  transform: translate3d(108%, 0, 0);
  visibility: hidden;
  pointer-events: none;
  will-change: transform;
  transition: transform 0.46s var(--qsd-ease),
              visibility 0s linear 0.46s;
  padding: 22px 0;
  touch-action: pan-y;
}

.qsd-mobile-panel.is-shown {
  transform: translate3d(0, 0, 0);
  visibility: visible;
  pointer-events: auto;
  transition: transform 0.46s var(--qsd-ease),
              visibility 0s linear 0s;
}

.qsd-mobile-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.qsd-mobile-close {
  width: 38px;
  height: 38px;
  border-radius: var(--qsd-radius-sm);
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  font-size: 1.2rem;
  cursor: pointer;
}

.qsd-mobile-nav ul {
  flex-direction: column;
  gap: 8px;
}

.qsd-mobile-nav a {
  display: block;
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius-sm);
  padding: 13px 15px;
  color: var(--qsd-text);
  font-weight: 500;
  transition: background var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-mobile-nav a:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

.qsd-mobile-cta {
  display: flex;
  width: 100%;
  margin-top: 18px;
}

/* =============================================================================
 * 04 · Buttons（钴蓝主轴 + 青霜湖光强调按钮 + 金穗琥珀朝霞光晕）
 * ============================================================================= */

.qsd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--qsd-radius-sm);
  border: 1px solid transparent;
  padding: 13px 24px;
  font-weight: 600;
  font-size: 0.97rem;
  letter-spacing: 0.01em;
  transition: transform var(--qsd-tx-xs), background var(--qsd-tx-xs),
              color var(--qsd-tx-xs), border-color var(--qsd-tx-xs),
              box-shadow var(--qsd-tx-xs);
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.qsd-btn:focus-visible {
  outline: 3px solid var(--qsd-amber);
  outline-offset: 2px;
}

/* 主按钮 · 靛宇钴蓝 → 穹宇深靛；hover 在右下绽放青霜湖光光晕 */
.qsd-btn--primary {
  background: linear-gradient(135deg, var(--qsd-primary) 0%, var(--qsd-primary-strong) 100%);
  color: #fff;
  box-shadow: 0 10px 26px rgba(79, 70, 229, 0.40);
}

.qsd-btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--qsd-primary-strong) 0%, var(--qsd-primary-deep) 100%);
  opacity: 0;
  transition: opacity var(--qsd-tx-xs);
  z-index: -1;
}

.qsd-btn--primary::after {
  content: "";
  position: absolute;
  width: 80%;
  height: 220%;
  right: -25%;
  bottom: -140%;
  background: radial-gradient(ellipse, rgba(20, 184, 166, 0.55), transparent 70%);
  opacity: 0;
  transition: opacity var(--qsd-tx-md), transform var(--qsd-tx-md);
  z-index: -1;
}

.qsd-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(79, 70, 229, 0.46),
              0 8px 22px rgba(20, 184, 166, 0.32);
}

.qsd-btn--primary:hover::before { opacity: 1; }
.qsd-btn--primary:hover::after  { opacity: 1; transform: translate(-18%, -12%); }

/* 青霜湖光强调按钮 · 用于二级强 CTA */
.qsd-btn--cyan {
  background: linear-gradient(135deg, var(--qsd-cyan) 0%, var(--qsd-cyan-strong) 100%);
  color: #fff;
  box-shadow: 0 10px 26px rgba(20, 184, 166, 0.42);
}

.qsd-btn--cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(20, 184, 166, 0.52);
  filter: brightness(1.04);
}

/* 幽灵按钮 · 描边 + hover 钴蓝填充 */
.qsd-btn--ghost {
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  border-color: var(--qsd-border);
}

.qsd-btn--ghost:hover {
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
  background: var(--qsd-primary-soft);
  transform: translateY(-1px);
}

/* 暗底反白按钮 · hero 内使用 */
.qsd-btn--on-dark {
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.32);
  backdrop-filter: blur(6px);
}

.qsd-btn--on-dark:hover {
  background: #fff;
  color: var(--qsd-primary-strong);
}

.qsd-btn--inverted {
  background: #fff;
  color: var(--qsd-primary-strong);
}

.qsd-btn--inverted:hover {
  background: var(--qsd-cyan-soft);
  color: var(--qsd-cyan-strong);
}

.qsd-btn--lg {
  padding: 15px 30px;
  font-size: 1.02rem;
  border-radius: var(--qsd-radius);
}

/* =============================================================================
 * 05 · Hero — 北极星徽面板
 * ============================================================================= */

.qsd-hero { padding: 56px 0 36px; }

.qsd-hero__panel {
  position: relative;
  border-radius: var(--qsd-radius-xl);
  padding: 72px 60px;
  background: var(--qsd-hero-grad);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--qsd-shadow-lg);
  isolation: isolate;
}

/* hero 背景：深湾繁星 + 经线条纹（湾光感） */
.qsd-hero__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.2px 1.2px at 14% 22%,   rgba(255,255,255,0.85), transparent),
    radial-gradient(1px 1px   at 76% 18%,     rgba(255,255,255,0.65), transparent),
    radial-gradient(1.4px 1.4px at 36% 64%,   rgba(255,255,255,0.80), transparent),
    radial-gradient(1px 1px   at 62% 78%,     rgba(255,255,255,0.55), transparent),
    radial-gradient(1.6px 1.6px at 88% 48%,   rgba(255,255,255,0.85), transparent),
    radial-gradient(1px 1px   at 22% 86%,     rgba(255,255,255,0.50), transparent),
    repeating-linear-gradient(
      115deg,
      rgba(255, 255, 255, 0.035) 0,
      rgba(255, 255, 255, 0.035) 1px,
      transparent 1px,
      transparent 44px
    );
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.5));
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.5));
  pointer-events: none;
}

/* hero 右上"青霜湖光"光斑 */
.qsd-hero__panel::after {
  content: "";
  position: absolute;
  width: 620px;
  height: 620px;
  right: -180px;
  top: -260px;
  border-radius: 50%;
  background: var(--qsd-tide-cyan);
  pointer-events: none;
  z-index: 0;
}

/* hero 左下"金穗琥珀朝霞"光斑（与星涟形成对角张力） */
.qsd-hero__panel > .qsd-glow-amber {
  position: absolute;
  width: 380px;
  height: 380px;
  left: -130px;
  bottom: -140px;
  border-radius: 50%;
  background: var(--qsd-tide-amber);
  pointer-events: none;
  z-index: 0;
}

/* hero 右上"北极星针"光痕（替代旧主题的"北极星针"） */
.qsd-hero__panel > .qsd-beacon {
  position: absolute;
  width: 110px;
  height: 110px;
  right: 8%;
  top: 14%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.9;
}

.qsd-hero__panel > .qsd-beacon::before,
.qsd-hero__panel > .qsd-beacon::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.85) 50%, transparent 100%);
  filter: blur(0.4px);
}

.qsd-hero__panel > .qsd-beacon::before {
  height: 1.5px;
  top: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 10px rgba(20, 184, 166, 0.85);
  animation: qmBeaconHorz 2.6s ease-in-out infinite;
}

.qsd-hero__panel > .qsd-beacon::after {
  width: 1.5px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.85) 50%, transparent 100%);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.85);
  animation: qmBeaconVert 2.6s ease-in-out infinite;
}

@keyframes qmBeaconHorz {
  0%, 100% { opacity: 0.6; transform: translateY(-50%) scaleX(1);   }
  50%      { opacity: 1;   transform: translateY(-50%) scaleX(1.4); }
}

@keyframes qmBeaconVert {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scaleY(1);   }
  50%      { opacity: 1;   transform: translateX(-50%) scaleY(1.4); }
}

.qsd-hero__grid {
  position: relative;
  display: grid;
  gap: 44px;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  z-index: 1;
}

.qsd-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #c7d2fe;
  border: 1px solid rgba(255, 255, 255, 0.30);
  border-radius: var(--qsd-pill);
  padding: 7px 16px 7px 12px;
  margin: 0 0 22px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
}

.qsd-hero__eyebrow::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--qsd-cyan), var(--qsd-amber));
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.30);
}

.qsd-hero__title {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 4.8vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  font-weight: 800;
}

/* 高亮词 · 青霜湖光 → 金穗琥珀（冷暖反相） */
.qsd-hero__title em {
  font-style: normal;
  background: linear-gradient(95deg, #fcd34d 0%, #a5b4fc 28%, #fcd34d 76%, #ffffff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.qsd-hero__lead {
  margin: 0 0 32px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.08rem;
  max-width: 560px;
  line-height: 1.7;
}

.qsd-hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.qsd-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.qsd-hero__chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--qsd-pill);
  padding: 8px 14px;
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(4px);
}

.qsd-hero__chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--qsd-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.30);
}

/* hero 右侧实时面板 · 毛玻璃 + 钴蓝→青霜→金穗渐变描边 */
.qsd-hero__widget {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  border-radius: var(--qsd-radius);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.qsd-hero__widget::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg,
    rgba(79, 70, 229, 0.55) 0%,
    rgba(20, 184, 166, 0.60) 50%,
    rgba(245, 158, 11, 0.55) 100%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.qsd-hero__widget h2 {
  margin: 0 0 18px;
  font-size: 1.08rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.qsd-hero__widget h2::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--qsd-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.34);
  animation: qmPulse 1.8s ease-in-out infinite;
}

@keyframes qmPulse {
  0%, 100% { transform: scale(1);    opacity: 1;    }
  50%      { transform: scale(1.35); opacity: 0.55; }
}

.qsd-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.qsd-metric {
  border-radius: var(--qsd-radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 14px 16px;
}

.qsd-metric small {
  display: block;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.qsd-metric strong {
  display: block;
  font-size: 1.32rem;
  color: #fff;
  font-weight: 800;
}

/* =============================================================================
 * 06 · Trust strip / 信任 KPI 条
 * ============================================================================= */

.qsd-stats-strip { padding: 40px 0 16px; }

.qsd-stats-strip__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.qsd-stat-tile {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 22px 22px;
  text-align: center;
  box-shadow: var(--qsd-shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--qsd-tx-sm), box-shadow var(--qsd-tx-sm);
}

/* 悬停下方升起一根 钴蓝→青霜→金穗 三段渐变线 */
.qsd-stat-tile::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  height: 3px;
  width: 0;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(90deg, var(--qsd-primary), var(--qsd-cyan), var(--qsd-amber));
  transition: width var(--qsd-tx-md), left var(--qsd-tx-md);
}

.qsd-stat-tile:hover {
  transform: translateY(-3px);
  box-shadow: var(--qsd-shadow);
}

.qsd-stat-tile:hover::after {
  width: 70%;
  left: 15%;
}

.qsd-stat-tile strong {
  display: block;
  font-size: 1.45rem;
  color: var(--qsd-ink);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.qsd-stat-tile span {
  color: var(--qsd-text-soft);
  font-size: 0.88rem;
}

/* =============================================================================
 * 07 · Card grids（功能 / 场景 / 帮助 / FAQ / 博客）
 * ============================================================================= */

.qsd-card-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.qsd-cap-card,
.qsd-download-card,
.qsd-plan-card,
.qsd-faq-item,
.qsd-blog-card,
.qsd-help-card {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  box-shadow: var(--qsd-shadow-xs);
  transition: transform var(--qsd-tx-md), border-color var(--qsd-tx-xs),
              box-shadow var(--qsd-tx-md);
}

.qsd-cap-card {
  padding: 28px 26px;
  position: relative;
  overflow: hidden;
}

/* 卡片 hover 左侧探出 3px 钴蓝→青霜→金穗渐变线 */
.qsd-cap-card::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--qsd-primary), var(--qsd-cyan), var(--qsd-amber));
  transform: scaleY(0.2);
  transform-origin: top;
  opacity: 0;
  transition: transform var(--qsd-tx-md), opacity var(--qsd-tx-md);
}

.qsd-cap-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 70, 229, 0.30);
  box-shadow: var(--qsd-shadow);
}

.qsd-cap-card:hover::before {
  transform: scaleY(1);
  opacity: 1;
}

.qsd-cap-card__icon {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-cyan-soft));
  font-size: 1.4rem;
  margin-bottom: 18px;
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.18);
}

.qsd-cap-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--qsd-ink);
}

.qsd-cap-card p {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 0.94rem;
  line-height: 1.65;
}

/* =============================================================================
 * 08 · Plan cards / 订阅套餐 / 计费切换
 * ============================================================================= */

.qsd-billing-switch {
  display: inline-flex;
  align-items: center;
  margin: 0 auto 38px;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-pill);
  padding: 4px;
  gap: 4px;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-billing-switch button {
  border: 0;
  background: transparent;
  border-radius: var(--qsd-pill);
  padding: 9px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--qsd-text-soft);
  cursor: pointer;
  transition: background var(--qsd-tx-xs), color var(--qsd-tx-xs);
}

.qsd-billing-switch button.is-active {
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  color: #fff;
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.32);
}

.qsd-plans {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  align-items: stretch;
}

.qsd-plan-card {
  padding: 30px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.qsd-plan-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qsd-shadow);
  border-color: rgba(79, 70, 229, 0.30);
}

.qsd-plan-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.qsd-plan-card h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--qsd-ink);
}

.qsd-plan-card__note {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 0.92rem;
  min-height: 38px;
}

.qsd-plan-card__price {
  margin: 6px 0 14px;
  font-weight: 800;
  font-size: 2.05rem;
  color: var(--qsd-ink);
  letter-spacing: -0.02em;
}

.qsd-plan-card__price span {
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--qsd-text-soft);
  margin-left: 6px;
}

.qsd-plan-card ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  flex: 1;
  display: grid;
  gap: 10px;
}

.qsd-plan-card li {
  position: relative;
  padding-left: 24px;
  font-size: 0.94rem;
  color: var(--qsd-text);
}

.qsd-plan-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-amber-soft));
  border: 1.6px solid var(--qsd-primary);
}

.qsd-plan-card li::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 9px;
  width: 6px;
  height: 3px;
  border-left: 1.6px solid var(--qsd-primary);
  border-bottom: 1.6px solid var(--qsd-primary);
  transform: rotate(-45deg);
}

.qsd-plan-card .qsd-btn {
  width: 100%;
}

.qsd-plan-badge {
  display: inline-flex;
  align-items: center;
  background: var(--qsd-bg-alt);
  color: var(--qsd-text-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--qsd-pill);
  text-transform: uppercase;
}

.qsd-plan-badge--accent {
  background: linear-gradient(135deg, var(--qsd-cyan), var(--qsd-primary));
  color: #fff;
  box-shadow: 0 4px 10px rgba(20, 184, 166, 0.30);
}

/* 推荐套餐 · 渐变描边 + ribbon */
.qsd-plan-card--featured {
  border-color: transparent;
  background:
    linear-gradient(var(--qsd-surface), var(--qsd-surface)) padding-box,
    linear-gradient(140deg, var(--qsd-primary), var(--qsd-cyan) 60%, var(--qsd-amber)) border-box;
  border-width: 2px;
  border-style: solid;
  box-shadow: 0 18px 38px rgba(79, 70, 229, 0.22);
}

.qsd-plan-card--featured::after {
  content: attr(data-ribbon);
  position: absolute;
  top: -14px;
  right: 22px;
  background: linear-gradient(135deg, var(--qsd-cyan), var(--qsd-primary));
  color: #fff;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border-radius: var(--qsd-pill);
  box-shadow: 0 6px 14px rgba(20, 184, 166, 0.34);
}

/* =============================================================================
 * 09 · Comparison table
 * ============================================================================= */

.qsd-compare-wrap {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  overflow: hidden;
  box-shadow: var(--qsd-shadow-sm);
  overflow-x: auto;
}

.qsd-compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.qsd-compare-table thead {
  background: linear-gradient(180deg, var(--qsd-primary-soft), transparent);
}

.qsd-compare-table th,
.qsd-compare-table td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid var(--qsd-border);
  vertical-align: top;
}

.qsd-compare-table thead th {
  font-weight: 700;
  color: var(--qsd-ink);
  font-size: 0.95rem;
}

.qsd-compare-table tbody th {
  font-weight: 600;
  color: var(--qsd-ink);
  background: var(--qsd-surface-soft);
  width: 30%;
}

.qsd-compare-table tbody tr:last-child th,
.qsd-compare-table tbody tr:last-child td {
  border-bottom: 0;
}

/* =============================================================================
 * 10 · Download cards
 * ============================================================================= */

.qsd-download-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.qsd-download-card {
  padding: 22px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--qsd-text);
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.qsd-download-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg,
    rgba(79, 70, 229, 0) 0%,
    rgba(20, 184, 166, 0) 50%,
    rgba(245, 158, 11, 0) 100%);
  z-index: -1;
  transition: background var(--qsd-tx-md);
}

.qsd-download-card:hover {
  transform: translateY(-3px);
  border-color: rgba(79, 70, 229, 0.35);
  box-shadow: var(--qsd-shadow);
}

.qsd-download-card:hover::before {
  background: linear-gradient(135deg,
    rgba(79, 70, 229, 0.07) 0%,
    rgba(20, 184, 166, 0.05) 50%,
    rgba(245, 158, 11, 0.07) 100%);
}

.qsd-download-card__platform {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--qsd-ink);
}

.qsd-download-card__hint {
  color: var(--qsd-text-soft);
  font-size: 0.86rem;
}

/* =============================================================================
 * 11 · Testimonials carousel
 * ============================================================================= */

.qsd-testimonials {
  position: relative;
  overflow: hidden;
  padding: 4px;
}

.qsd-testimonials__track {
  display: flex;
  gap: 22px;
  transition: transform var(--qsd-tx-md);
}

.qsd-testimonial-card {
  flex: 0 0 calc((100% - 44px) / 3);
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 26px 24px;
  box-shadow: var(--qsd-shadow-xs);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qsd-testimonial-card p {
  margin: 0;
  color: var(--qsd-text);
  line-height: 1.7;
  font-size: 0.96rem;
}

.qsd-testimonial-card strong {
  color: var(--qsd-text-soft);
  font-weight: 600;
  font-size: 0.86rem;
}

.qsd-carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 22px;
}

.qsd-carousel-arrow {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-carousel-arrow:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

.qsd-carousel-dots {
  display: flex;
  gap: 8px;
}

.qsd-carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: var(--qsd-border-strong);
  cursor: pointer;
  transition: background var(--qsd-tx-xs), transform var(--qsd-tx-xs);
}

.qsd-carousel-dot.is-active {
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  transform: scale(1.25);
}

/* =============================================================================
 * 12 · Step list（5-step quickstart）
 * ============================================================================= */

.qsd-step-list {
  list-style: none;
  padding: 0;
}

.qsd-step-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 18px 22px;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.34);
}

.qsd-step-list strong {
  color: var(--qsd-ink);
}

/* =============================================================================
 * 13 · FAQ accordion
 * ============================================================================= */

.qsd-faq {
  display: grid;
  gap: 14px;
  max-width: 880px;
  margin: 0 auto;
}

.qsd-faq-item {
  padding: 0;
  overflow: hidden;
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs);
}

.qsd-faq-item.is-open {
  border-color: rgba(79, 70, 229, 0.32);
  box-shadow: var(--qsd-shadow-sm);
}

.qsd-faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  padding: 20px 22px;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--qsd-ink);
  transition: color var(--qsd-tx-xs);
}

.qsd-faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--qsd-primary);
  transition: transform var(--qsd-tx-sm);
}

.qsd-faq-item.is-open .qsd-faq-question {
  color: var(--qsd-primary-strong);
}

.qsd-faq-item.is-open .qsd-faq-question::after {
  transform: rotate(45deg);
}

.qsd-faq-answer {
  padding: 0 22px 22px;
  color: var(--qsd-text-soft);
  line-height: 1.7;
  font-size: 0.96rem;
}

.qsd-faq-answer p { margin: 0; }

/* =============================================================================
 * 14 · Blog cards
 * ============================================================================= */

.qsd-blog-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qsd-blog-archive {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 40px;
}

.qsd-blog-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.qsd-blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qsd-shadow);
  border-color: rgba(79, 70, 229, 0.30);
}

.qsd-blog-card__thumb {
  display: block;
  aspect-ratio: 16 / 9;
  background: var(--qsd-bg-alt);
  overflow: hidden;
}

.qsd-blog-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--qsd-tx-md);
}

.qsd-blog-card:hover .qsd-blog-card__thumb img {
  transform: scale(1.04);
}

.qsd-blog-card__body {
  padding: 22px 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.qsd-blog-card__meta {
  margin: 0;
  font-size: 0.82rem;
  color: var(--qsd-text-faint);
}

.qsd-blog-card__title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.45;
}

.qsd-blog-card__title a {
  color: var(--qsd-ink);
  transition: color var(--qsd-tx-xs);
}

.qsd-blog-card__title a:hover {
  color: var(--qsd-primary-strong);
}

.qsd-blog-card__excerpt {
  margin: 0;
  color: var(--qsd-text-soft);
  font-size: 0.92rem;
  line-height: 1.65;
  flex: 1;
}

.qsd-blog-card__link {
  margin-top: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--qsd-primary);
  align-self: flex-start;
  transition: color var(--qsd-tx-xs);
}

.qsd-blog-card__link:hover { color: var(--qsd-cyan-strong); }

/* =============================================================================
 * 15 · Tag cloud
 * ============================================================================= */

.qsd-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.qsd-tag-cloud a {
  display: inline-flex;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  color: var(--qsd-text);
  padding: 7px 14px;
  border-radius: var(--qsd-pill);
  font-size: 0.88rem;
  transition: background var(--qsd-tx-xs), color var(--qsd-tx-xs),
              border-color var(--qsd-tx-xs);
}

.qsd-tag-cloud a:hover {
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-cyan-soft));
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

/* =============================================================================
 * 16 · CTA strip
 * ============================================================================= */

.qsd-cta-strip {
  background: var(--qsd-hero-grad);
  border-radius: var(--qsd-radius-xl);
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--qsd-shadow-lg);
}

.qsd-cta-strip::after {
  content: "";
  position: absolute;
  width: 480px;
  height: 480px;
  right: -120px;
  top: -160px;
  border-radius: 50%;
  background: var(--qsd-tide-cyan);
  pointer-events: none;
}

.qsd-cta-strip > * { position: relative; z-index: 1; }

.qsd-cta-strip h2 {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: -0.01em;
}

.qsd-cta-strip p {
  margin: 0;
  color: rgba(255, 255, 255, 0.84);
}

.qsd-cta-strip__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* =============================================================================
 * 17 · Footer
 * ============================================================================= */

.qsd-footer {
  margin-top: 80px;
  background: linear-gradient(180deg, transparent, rgba(79, 70, 229, 0.04));
  border-top: 1px solid var(--qsd-border);
  padding: 60px 0 28px;
  color: var(--qsd-text-soft);
}

.qsd-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--qsd-border);
}

.qsd-footer__col--brand { min-width: 0; }

.qsd-footer__contact-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 6px;
  font-size: 0.88rem;
  line-height: 1.55;
}

.qsd-footer__contact-list li {
  display: grid;
  grid-template-columns: minmax(110px, 140px) 1fr;
  gap: 8px;
  align-items: baseline;
}

.qsd-footer__contact-label {
  color: var(--qsd-text-faint);
  letter-spacing: 0.02em;
  font-size: 0.78rem;
  text-transform: uppercase;
  font-weight: 600;
}

.qsd-footer__contact-list a {
  color: var(--qsd-primary-strong);
  word-break: break-word;
  border-bottom: 1px dashed transparent;
  transition: color var(--qsd-tx-xs), border-color var(--qsd-tx-xs);
}

.qsd-footer__contact-list a:hover {
  color: var(--qsd-cyan-strong);
  border-bottom-color: var(--qsd-cyan);
}

/* —— v10 信任徽章带（顶置 · ISO / SOC 2 / CSA STAR） —— */
.qsd-footer__trust {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 0 0 26px;
  border-bottom: 1px dashed var(--qsd-border);
  margin-bottom: 26px;
}

.qsd-footer__trust-label {
  color: var(--qsd-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 700;
}

.qsd-footer__trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.qsd-footer__trust-item {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: var(--qsd-pill);
  background: var(--qsd-cyan-soft);
  color: var(--qsd-cyan-strong);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  border: 1px solid rgba(20, 184, 166, 0.18);
}

/* —— 社交矩阵条 —— */
.qsd-footer__social {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  font-size: 0.92rem;
  padding: 22px 0 0;
}

.qsd-footer__social-label {
  color: var(--qsd-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 700;
}

.qsd-footer__social a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--qsd-pill);
  background: var(--qsd-primary-soft);
  color: var(--qsd-primary-strong);
  font-weight: 600;
  font-size: 0.84rem;
  border: 1px solid transparent;
  transition: background var(--qsd-tx-xs),
              border-color var(--qsd-tx-xs),
              transform var(--qsd-tx-xs);
}

.qsd-footer__social a:hover {
  background: #fff;
  border-color: var(--qsd-primary);
  transform: translateY(-1px);
}

.qsd-footer h4 {
  margin: 0 0 16px;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--qsd-ink);
}

.qsd-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.qsd-footer ul a {
  color: var(--qsd-text-soft);
  font-size: 0.92rem;
  transition: color var(--qsd-tx-xs);
}

.qsd-footer ul a:hover { color: var(--qsd-primary-strong); }

.qsd-footer__brand-text {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 360px;
}

.qsd-footer__brand-text a { color: var(--qsd-primary-strong); }

.qsd-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--qsd-text-faint);
  padding-top: 24px;
}

.qsd-footer__friends {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.qsd-footer__friends a {
  color: var(--qsd-primary);
  transition: color var(--qsd-tx-xs);
}

.qsd-footer__friends a:hover { color: var(--qsd-cyan-strong); }

/* =============================================================================
 * 18 · Page banner（用于 blog / help / privacy / terms / about / contact）
 * ============================================================================= */

.qsd-page-banner {
  position: relative;
  padding: 96px 0 60px;
  background:
    radial-gradient(ellipse 80% 60% at 80% 10%, rgba(20, 184, 166, 0.20), transparent 55%),
    radial-gradient(ellipse 60% 50% at 12% 90%, rgba(245, 158, 11, 0.15), transparent 55%),
    linear-gradient(180deg, rgba(79, 70, 229, 0.08), transparent 100%);
  border-bottom: 1px solid var(--qsd-border);
  text-align: center;
  overflow: hidden;
}

.qsd-page-banner h1 {
  margin: 8px auto 14px;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  color: var(--qsd-ink);
  max-width: 880px;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.qsd-page-banner p {
  margin: 0 auto;
  max-width: 720px;
  color: var(--qsd-text-soft);
  font-size: 1rem;
}

.qsd-page-body {
  padding: 60px 0 96px;
}

/* =============================================================================
 * 19 · Breadcrumb
 * ============================================================================= */

.qsd-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--qsd-text-soft);
  margin-bottom: 28px;
}

.qsd-breadcrumb a {
  color: var(--qsd-text-soft);
  transition: color var(--qsd-tx-xs);
}

.qsd-breadcrumb a:hover { color: var(--qsd-primary-strong); }

.qsd-breadcrumb__sep { color: var(--qsd-text-faint); }

.qsd-breadcrumb [aria-current="page"] {
  color: var(--qsd-ink);
  font-weight: 600;
}

/* =============================================================================
 * 20 · Single post
 * ============================================================================= */

.qsd-single { padding: 48px 0 96px; }

.qsd-post-header { margin-bottom: 28px; }

.qsd-post-title {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  color: var(--qsd-ink);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.qsd-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--qsd-text-soft);
}

.qsd-post-meta a {
  color: var(--qsd-primary);
  transition: color var(--qsd-tx-xs);
}

.qsd-post-meta a:hover { color: var(--qsd-cyan-strong); }

.qsd-post-meta__sep { color: var(--qsd-text-faint); }

.qsd-read-time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--qsd-primary-soft);
  color: var(--qsd-primary-strong);
  padding: 4px 10px;
  border-radius: var(--qsd-pill);
  font-size: 0.78rem;
  font-weight: 600;
}

.qsd-read-time::before {
  content: "⌛";
  font-size: 0.86rem;
}

/* TL;DR 摘要框 */
.qsd-tldr {
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-cyan-soft));
  border-left: 4px solid var(--qsd-primary);
  border-radius: var(--qsd-radius-sm);
  padding: 16px 20px;
  margin: 0 0 28px;
  color: var(--qsd-ink-soft);
  line-height: 1.7;
  font-size: 0.96rem;
}

.qsd-tldr strong { color: var(--qsd-primary-strong); }

.qsd-post-thumbnail {
  margin: 0 0 28px;
  border-radius: var(--qsd-radius);
  overflow: hidden;
  box-shadow: var(--qsd-shadow-sm);
}

.qsd-post-featured-image {
  width: 100%;
  height: auto;
  display: block;
}

/* TOC 自动目录 */
.qsd-toc {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-left: 4px solid var(--qsd-primary);
  border-radius: var(--qsd-radius-sm);
  padding: 18px 22px;
  margin: 0 0 32px;
  font-size: 0.94rem;
}

.qsd-toc strong {
  display: block;
  margin-bottom: 10px;
  color: var(--qsd-ink);
  font-size: 0.95rem;
}

.qsd-toc ol {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 6px;
}

.qsd-toc a {
  color: var(--qsd-text-soft);
  transition: color var(--qsd-tx-xs);
}

.qsd-toc a:hover { color: var(--qsd-primary-strong); }

/* Prose */
.qsd-prose,
.qsd-post-content {
  color: var(--qsd-text);
  line-height: 1.8;
  font-size: 1rem;
  max-width: 760px;
  margin: 0 auto;
}

.qsd-prose h2,
.qsd-post-content h2 {
  margin: 40px 0 14px;
  color: var(--qsd-ink);
  font-size: 1.4rem;
  letter-spacing: -0.005em;
  scroll-margin-top: 90px;
}

.qsd-prose h3,
.qsd-post-content h3 {
  margin: 28px 0 10px;
  color: var(--qsd-ink);
  font-size: 1.16rem;
  scroll-margin-top: 90px;
}

.qsd-prose p,
.qsd-post-content p {
  margin: 0 0 16px;
}

.qsd-prose ul,
.qsd-prose ol,
.qsd-post-content ul,
.qsd-post-content ol {
  padding-left: 22px;
  margin: 0 0 18px;
}

.qsd-prose li,
.qsd-post-content li { margin: 6px 0; }

.qsd-prose code,
.qsd-post-content code {
  font-family: var(--qsd-font-mono);
  background: var(--qsd-bg-alt);
  border: 1px solid var(--qsd-border);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.9em;
  color: var(--qsd-cyan-strong);
}

.qsd-prose blockquote,
.qsd-post-content blockquote {
  margin: 22px 0;
  padding: 14px 22px;
  border-left: 4px solid var(--qsd-cyan);
  background: linear-gradient(90deg, var(--qsd-cyan-soft), transparent 80%);
  color: var(--qsd-text);
  font-style: italic;
  border-radius: 0 var(--qsd-radius-sm) var(--qsd-radius-sm) 0;
}

.qsd-prose__callout {
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-amber-soft));
  border: 1px solid rgba(79, 70, 229, 0.18);
  border-radius: var(--qsd-radius);
  padding: 18px 22px;
  margin: 0 0 30px;
  color: var(--qsd-ink-soft);
  font-size: 0.97rem;
  line-height: 1.7;
}

.qsd-bullets {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 8px;
}

.qsd-bullets > li {
  position: relative;
  padding-left: 22px;
}

.qsd-bullets > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
}

/* Author bio · E-E-A-T */
.qsd-author-bio {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 22px 24px;
  margin: 40px 0 0;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-author-bio__mark {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.4rem;
  flex-shrink: 0;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.34);
}

.qsd-author-bio__body { flex: 1; }

.qsd-author-bio__name {
  display: block;
  color: var(--qsd-ink);
  font-size: 1rem;
}

.qsd-author-bio__role {
  color: var(--qsd-primary-strong);
  font-size: 0.84rem;
  margin-left: 8px;
}

.qsd-author-bio__desc {
  margin: 8px 0 0;
  color: var(--qsd-text-soft);
  font-size: 0.94rem;
  line-height: 1.7;
}

/* Related posts */
.qsd-related {
  margin: 40px 0 0;
}

.qsd-related h2 {
  margin: 0 0 16px;
  color: var(--qsd-ink);
  font-size: 1.2rem;
}

.qsd-related__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qsd-related__item {
  display: block;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius-sm);
  padding: 16px 18px;
  color: var(--qsd-ink);
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs),
              transform var(--qsd-tx-xs);
  font-weight: 600;
  line-height: 1.5;
  font-size: 0.94rem;
}

.qsd-related__item small {
  display: block;
  color: var(--qsd-text-faint);
  font-size: 0.78rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.qsd-related__item:hover {
  border-color: rgba(79, 70, 229, 0.32);
  box-shadow: var(--qsd-shadow-sm);
  transform: translateY(-2px);
}

/* Post navigation · prev / next */
.qsd-post-nav {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr 1fr;
  margin-top: 48px;
}

.qsd-post-nav__prev,
.qsd-post-nav__next {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 16px 20px;
  color: var(--qsd-ink);
  transition: border-color var(--qsd-tx-xs), box-shadow var(--qsd-tx-xs);
}

.qsd-post-nav__next { text-align: right; }

.qsd-post-nav__prev:hover,
.qsd-post-nav__next:hover {
  border-color: rgba(79, 70, 229, 0.32);
  box-shadow: var(--qsd-shadow-sm);
}

.qsd-post-nav__label {
  display: block;
  font-size: 0.78rem;
  color: var(--qsd-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.qsd-post-nav__title {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
}

.qsd-post-pages {
  margin: 24px 0 0;
  font-size: 0.92rem;
  color: var(--qsd-text-soft);
}

.qsd-post-pages a {
  display: inline-block;
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  padding: 4px 10px;
  border-radius: var(--qsd-radius-sm);
  margin: 0 4px;
  color: var(--qsd-text);
}

/* =============================================================================
 * 21 · Help center grid
 * ============================================================================= */

.qsd-help-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 50px;
}

.qsd-help-card {
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qsd-help-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--qsd-shadow);
  border-color: rgba(79, 70, 229, 0.30);
}

.qsd-help-card__icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--qsd-primary-soft), var(--qsd-amber-soft));
  font-size: 1.2rem;
}

.qsd-help-card__links {
  list-style: none;
  padding: 0;
  margin: 6px 0 0;
  display: grid;
  gap: 6px;
}

.qsd-help-card__links a {
  color: var(--qsd-text-soft);
  font-size: 0.9rem;
  transition: color var(--qsd-tx-xs);
}

.qsd-help-card__links a:hover { color: var(--qsd-primary-strong); }

.qsd-help-section {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 28px 32px;
  margin: 0 0 24px;
  box-shadow: var(--qsd-shadow-xs);
  scroll-margin-top: 90px;
}

.qsd-help-section h2 {
  margin: 0 0 14px;
  color: var(--qsd-ink);
  font-size: 1.3rem;
  letter-spacing: -0.005em;
}

.qsd-help-section h3 {
  margin: 24px 0 10px;
  color: var(--qsd-ink);
  font-size: 1.05rem;
  scroll-margin-top: 90px;
}

.qsd-help-section p {
  margin: 0 0 14px;
  color: var(--qsd-text);
  line-height: 1.75;
}

.qsd-help-section ul {
  margin: 0 0 16px;
  padding-left: 22px;
  color: var(--qsd-text);
}

.qsd-help-section li { margin: 6px 0; }

.qsd-help-section code {
  font-family: var(--qsd-font-mono);
  background: var(--qsd-bg-alt);
  border: 1px solid var(--qsd-border);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.9em;
  color: var(--qsd-cyan-strong);
}

/* —— Contact 表单 + 联系信息块 —— */
.qsd-contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: start;
}

.qsd-contact-card {
  background: var(--qsd-surface);
  border: 1px solid var(--qsd-border);
  border-radius: var(--qsd-radius);
  padding: 26px 28px;
  box-shadow: var(--qsd-shadow-xs);
}

.qsd-contact-card h3 {
  margin: 0 0 10px;
  color: var(--qsd-ink);
}

.qsd-contact-card p,
.qsd-contact-card a {
  color: var(--qsd-text);
}

.qsd-contact-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.qsd-contact-card ul li::before {
  content: "›";
  color: var(--qsd-primary);
  margin-right: 8px;
  font-weight: 700;
}

/* =============================================================================
 * 22 · Pagination
 * ============================================================================= */

.qsd-pagination {
  display: flex;
  justify-content: center;
  margin: 36px 0;
}

.qsd-pagination ul {
  list-style: none;
  display: flex;
  gap: 8px;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  justify-content: center;
}

.qsd-pagination a,
.qsd-pagination span {
  display: inline-grid;
  place-items: center;
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  border-radius: var(--qsd-radius-sm);
  border: 1px solid var(--qsd-border);
  background: var(--qsd-surface);
  color: var(--qsd-ink);
  font-weight: 600;
  font-size: 0.92rem;
  transition: background var(--qsd-tx-xs), color var(--qsd-tx-xs),
              border-color var(--qsd-tx-xs);
}

.qsd-pagination a:hover {
  background: var(--qsd-primary-soft);
  border-color: var(--qsd-primary);
  color: var(--qsd-primary-strong);
}

.qsd-pagination .current {
  background: linear-gradient(135deg, var(--qsd-primary), var(--qsd-cyan));
  color: #fff;
  border-color: transparent;
}

/* =============================================================================
 * 23 · Responsive
 * ============================================================================= */

@media (max-width: 1024px) {
  .qsd-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-plans { grid-template-columns: 1fr; }
  .qsd-download-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .qsd-blog-grid,
  .qsd-blog-archive { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-help-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-related__grid { grid-template-columns: 1fr; }
  .qsd-footer__inner {
    grid-template-columns: 1.4fr 1fr 1fr;
    grid-auto-rows: minmax(0, auto);
  }
  .qsd-footer__col--brand { grid-column: 1 / -1; }
  .qsd-hero__grid { grid-template-columns: 1fr; }
  .qsd-hero__panel { padding: 56px 36px; }
  .qsd-stats-strip__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-testimonial-card { flex: 0 0 calc((100% - 22px) / 2); }
  .qsd-contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .qsd-section { padding: 64px 0; }
  .qsd-card-grid { grid-template-columns: 1fr; }
  .qsd-download-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qsd-blog-grid,
  .qsd-blog-archive,
  .qsd-help-grid { grid-template-columns: 1fr; }
  .qsd-footer__inner { grid-template-columns: 1fr; }
  .qsd-footer__col--brand { grid-column: auto; }
  .qsd-footer__contact-list li { grid-template-columns: 1fr; gap: 2px; }
  .qsd-nav { display: none; }
  .qsd-menu-toggle { display: inline-flex; }
  .qsd-hero__panel { padding: 44px 24px; }
  .qsd-hero__title { font-size: clamp(1.7rem, 7vw, 2.2rem); }
  .qsd-cta-strip { padding: 38px 28px; flex-direction: column; align-items: flex-start; }
  .qsd-testimonial-card { flex: 0 0 100%; }
  .qsd-post-nav { grid-template-columns: 1fr; }
  .qsd-help-section { padding: 22px 20px; }
}

@media (max-width: 480px) {
  .qsd-stats-strip__grid { grid-template-columns: 1fr; }
  .qsd-billing-switch { width: 100%; }
  .qsd-billing-switch button { flex: 1; }
}

/* =============================================================================
 * 24 · Reveal-on-scroll
 * ============================================================================= */

[data-qsd-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--qsd-ease-out), transform 0.7s var(--qsd-ease-out);
}

[data-qsd-reveal].is-shown {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  [data-qsd-reveal] { opacity: 1; transform: none; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* =============================================================================
 * 25 · Print stylesheet
 * ============================================================================= */

@media print {
  .qsd-header,
  .qsd-footer,
  .qsd-mobile-overlay,
  .qsd-mobile-panel,
  .qsd-cta-strip,
  .qsd-related,
  .qsd-post-nav,
  .qsd-tag-cloud,
  .qsd-skip,
  [data-qsd-reveal] { display: none !important; opacity: 1 !important; }

  body { background: #fff !important; color: #000 !important; }
  .qsd-prose, .qsd-post-content { max-width: none !important; }
  a { color: inherit !important; text-decoration: underline !important; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.85em; color: #555; }
}

/* =============================================================================
 * 26 · Legacy shims — 兼容旧 qb-* / qp-* 类名（保护既有插件 / 编辑器内容）
 * 仅为视觉兜底；新增内容应一律使用 qsd-* 命名空间。
 * ============================================================================= */

.qb-shell, .qp-shell           { min-height: 100vh; display: flex; flex-direction: column; overflow-x: clip; }
.qb-container, .qp-container   { width: min(92%, var(--qsd-container)); margin-inline: auto; }
.qb-main, .qp-main             { flex: 1; }
.qb-section, .qp-section       { padding: 96px 0; }
.qb-prose,  .qp-prose,
.qb-post-content,
.qp-post-content               { color: var(--qsd-text); line-height: 1.8; }
.qb-footer, .qp-footer         { margin-top: 80px; padding: 60px 0 28px; }

/* =============================================================================
 * 27 · Stellar DriftRoute 协议徽章 / 星轨光痕装饰（v15 重塑 · 星宇航迹专属组件）
 * ---------------------------------------------------------------------------
 * 用法：
 *   <span class="qsd-wing-badge">Stellar DriftRoute</span>
 *   <div class="qsd-trail-deco" aria-hidden="true"></div>
 * 设计意图：在文章 / 卡片中加入"双层椭圆星轨光痕"装饰，呼应 Logo 的北极星 + 椭圆星轨母题。
 * ============================================================================= */

.qsd-wing-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 8px;
  border-radius: var(--qsd-pill);
  background: linear-gradient(95deg,
              var(--qsd-primary-soft) 0%,
              #ffffff 100%);
  color: var(--qsd-primary-strong);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid rgba(79, 70, 229, 0.22);
  line-height: 1;
}

.qsd-wing-badge::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 30% 30%, #fcd34d 0%, transparent 60%),
    radial-gradient(circle at 70% 70%, #fcd34d 0%, transparent 60%),
    var(--qsd-primary);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.20);
}

.qsd-trail-deco {
  position: relative;
  height: 1px;
  width: 100%;
  margin: 24px 0;
  background: linear-gradient(90deg,
              transparent 0%,
              var(--qsd-primary) 18%,
              var(--qsd-cyan) 50%,
              var(--qsd-amber) 82%,
              transparent 100%);
  opacity: 0.45;
}

.qsd-trail-deco::before,
.qsd-trail-deco::after {
  content: "";
  position: absolute;
  top: -3px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
}

.qsd-trail-deco::before {
  left: 18%;
  background: var(--qsd-primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.18);
}

.qsd-trail-deco::after {
  right: 18%;
  background: var(--qsd-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.20);
}