/* ============================================================
   91网页浏览器免费版 — 共享样式表
   主色：青蓝 #00b4d8 | 深色：深海军蓝 #023e8a | 白色背景
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --c-primary: #00b4d8;
  --c-primary-dark: #0096c7;
  --c-primary-light: #48cae4;
  --c-primary-soft: #caf0f8;
  --c-deep: #023e8a;
  --c-deep-2: #03045e;
  --c-ink: #0a2540;
  --c-text: #334155;
  --c-muted: #64748b;
  --c-line: #e2e8f0;
  --c-bg: #ffffff;
  --c-bg-soft: #f5fbfd;
  --c-bg-blue: #eef9fd;
  --c-card: #ffffff;
  --c-success: #10b981;
  --c-warn: #f59e0b;
  --c-danger: #ef4444;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 2px 8px rgba(2, 62, 138, 0.06);
  --shadow: 0 10px 30px rgba(2, 62, 138, 0.10);
  --shadow-lg: 0 24px 60px rgba(2, 62, 138, 0.16);
  --shadow-primary: 0 14px 34px rgba(0, 180, 216, 0.32);

  --grad-hero: radial-gradient(circle at 70% 30%, #caf0f8 0%, #90e0ef 35%, #00b4d8 100%);
  --grad-deep: linear-gradient(135deg, #023e8a 0%, #0077b6 60%, #00b4d8 100%);
  --grad-cyan: linear-gradient(135deg, #00b4d8 0%, #48cae4 100%);
  --grad-soft: linear-gradient(180deg, #ffffff 0%, #eef9fd 100%);

  --container: 1200px;
  --nav-h: 70px;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--c-primary-dark); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--c-deep); }
img, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4, h5 { color: var(--c-ink); line-height: 1.3; font-weight: 700; }

/* ---------- 容器 ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1320px; margin: 0 auto; padding: 0 24px; }

/* ============================================================
   导航栏
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-line);
  box-shadow: 0 2px 18px rgba(2, 62, 138, 0.06);
}
.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--c-ink);
  letter-spacing: .2px;
}
.brand-logo {
  width: 38px; height: 38px;
  border-radius: 11px;
  background: var(--grad-cyan);
  display: grid; place-items: center;
  box-shadow: 0 6px 14px rgba(0, 180, 216, 0.4);
  flex-shrink: 0;
}
.brand-logo svg { width: 22px; height: 22px; }
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--c-muted); letter-spacing: 1px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  position: relative;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--c-text);
  font-weight: 500;
  transition: all .2s ease;
}
.nav-links a:hover { background: var(--c-bg-blue); color: var(--c-deep); }
.nav-links a.active {
  color: var(--c-primary-dark);
  background: var(--c-primary-soft);
  font-weight: 600;
}
.nav-cta {
  background: var(--grad-cyan);
  color: #fff !important;
  padding: 9px 20px !important;
  border-radius: 999px;
  font-weight: 600 !important;
  box-shadow: 0 6px 16px rgba(0, 180, 216, 0.35);
  transition: transform .2s ease, box-shadow .2s ease;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(0, 180, 216, 0.5); background: var(--grad-cyan) !important; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 10px;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--c-ink);
  position: relative;
  border-radius: 2px;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0;
  width: 22px; height: 2px; background: var(--c-ink); border-radius: 2px;
  transition: .25s;
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

/* ============================================================
   通用按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: all .22s ease;
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  background: var(--grad-cyan);
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(0, 180, 216, 0.5); color: #fff; }
.btn-deep {
  background: var(--grad-deep);
  color: #fff;
  box-shadow: 0 14px 34px rgba(2, 62, 138, 0.3);
}
.btn-deep:hover { transform: translateY(-2px); color: #fff; }
.btn-outline {
  background: #fff;
  color: var(--c-deep);
  border-color: var(--c-primary);
}
.btn-outline:hover { background: var(--c-primary-soft); transform: translateY(-2px); }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.24); color: #fff; }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ============================================================
   通用区块
   ============================================================ */
section { position: relative; }
.section { padding: 90px 0; }
.section-sm { padding: 60px 0; }
.section-tight { padding: 50px 0; }
.bg-soft { background: var(--c-bg-soft); }
.bg-blue { background: var(--c-bg-blue); }
.bg-deep { background: var(--grad-deep); color: #dfeeff; }
.bg-deep h1, .bg-deep h2, .bg-deep h3, .bg-deep h4 { color: #fff; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head.left { text-align: left; margin-left: 0; }
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-primary-dark);
  background: var(--c-primary-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.section-head h2 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 16px; letter-spacing: -.5px; }
.section-head p { font-size: 17px; color: var(--c-muted); }

/* ---------- 装饰几何 ---------- */
.deco-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: .5;
  z-index: 0;
  pointer-events: none;
}

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  position: relative;
  padding: 80px 0 90px;
  background: var(--grad-hero);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 12% 20%, rgba(255,255,255,.5) 0, transparent 30%),
    radial-gradient(circle at 88% 78%, rgba(2,62,138,.18) 0, transparent 40%);
  pointer-events: none;
}
.hero-deco {
  position: absolute;
  pointer-events: none;
  z-index: 1;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(34px, 4.6vw, 52px);
  line-height: 1.15;
  letter-spacing: -1px;
  color: var(--c-deep-2);
  margin-bottom: 20px;
}
.hero-copy h1 .grad {
  background: linear-gradient(120deg, #0077b6, #00b4d8);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-copy .lead {
  font-size: 18px;
  color: #234e7a;
  margin-bottom: 30px;
  max-width: 540px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 28px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; font-size: 14px; color: #1d4e89; }
.hero-meta-item { display: flex; align-items: center; gap: 7px; }
.hero-meta-item svg { width: 18px; height: 18px; color: var(--c-primary-dark); }
.hero-version {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.7);
  border: 1px solid rgba(255,255,255,.9);
  padding: 6px 14px; border-radius: 999px;
  font-size: 13px; color: var(--c-deep); font-weight: 600;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}
.hero-version .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c-success); box-shadow: 0 0 0 4px rgba(16,185,129,.2); }

/* ---------- 浏览器窗口模拟 ---------- */
.browser-mock {
  position: relative;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 40px 80px rgba(2, 62, 138, 0.28), 0 0 0 1px rgba(255,255,255,.6);
  overflow: hidden;
  transform: perspective(1200px) rotateY(-5deg) rotateX(2deg);
  transition: transform .5s ease;
}
.browser-mock:hover { transform: perspective(1200px) rotateY(-2deg) rotateX(1deg); }
.browser-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  background: linear-gradient(180deg, #f1f6fa, #e6eef5);
  border-bottom: 1px solid #dbe5ee;
}
.browser-dots { display: flex; gap: 7px; }
.browser-dots i {
  width: 12px; height: 12px; border-radius: 50%;
  display: block;
}
.browser-dots i:nth-child(1) { background: #ff5f57; }
.browser-dots i:nth-child(2) { background: #febc2e; }
.browser-dots i:nth-child(3) { background: #28c840; }
.browser-url {
  flex: 1;
  background: #fff;
  border: 1px solid #d8e2ec;
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 12px;
  color: var(--c-muted);
  display: flex; align-items: center; gap: 8px;
}
.browser-url svg { width: 13px; height: 13px; color: var(--c-primary-dark); }
.browser-actions { display: flex; gap: 6px; }
.browser-actions i {
  width: 18px; height: 18px; border-radius: 4px;
  background: #cfdce8;
}
.browser-body { padding: 0; }
.browser-screen {
  background: linear-gradient(180deg, #ffffff, #f5fbfd);
  padding: 28px 24px;
  min-height: 320px;
  position: relative;
}
.browser-screen .bs-logo {
  width: 64px; height: 64px;
  border-radius: 18px;
  background: var(--grad-cyan);
  display: grid; place-items: center;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-primary);
}
.browser-screen .bs-logo svg { width: 36px; height: 36px; color: #fff; }
.browser-screen .bs-title {
  text-align: center; font-weight: 800; font-size: 20px; color: var(--c-deep-2);
  margin-bottom: 6px;
}
.browser-screen .bs-sub { text-align: center; font-size: 12px; color: var(--c-muted); margin-bottom: 18px; }
.browser-search {
  margin: 0 auto;
  max-width: 320px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  padding: 10px 18px;
  display: flex; align-items: center; gap: 10px;
  box-shadow: var(--shadow-sm);
}
.browser-search svg { width: 16px; height: 16px; color: var(--c-muted); }
.browser-search span { color: #b6c2cf; font-size: 13px; flex: 1; }
.bs-shortcuts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 22px;
}
.bs-shortcut {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.bs-shortcut .ic {
  width: 38px; height: 38px;
  border-radius: 12px;
  background: var(--c-primary-soft);
  display: grid; place-items: center;
}
.bs-shortcut .ic svg { width: 20px; height: 20px; color: var(--c-primary-dark); }
.bs-shortcut span { font-size: 11px; color: var(--c-text); }
.bs-tab {
  position: absolute; top: 0; left: 60px;
  background: #fff; padding: 8px 16px 8px 12px;
  border-radius: 0 0 10px 10px;
  font-size: 11px; color: var(--c-deep);
  display: flex; align-items: center; gap: 6px;
  border: 1px solid #dbe5ee; border-top: none;
  font-weight: 600;
}
.bs-tab .ic { width: 14px; height: 14px; border-radius: 4px; background: var(--grad-cyan); }

/* ---------- Hero 波浪 ---------- */
.hero-wave {
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  z-index: 1;
  line-height: 0;
}
.hero-wave svg { width: 100%; height: 70px; display: block; }

/* ============================================================
   特性交替图文
   ============================================================ */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 90px;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row.flip .feature-visual { order: 2; }
.feature-copy .eyebrow { margin-bottom: 14px; }
.feature-copy h3 { font-size: clamp(26px, 3vw, 34px); margin-bottom: 16px; color: var(--c-ink); }
.feature-copy p { font-size: 16px; color: var(--c-muted); margin-bottom: 22px; }
.feature-list { display: flex; flex-direction: column; gap: 14px; }
.feature-list li {
  display: flex; gap: 12px; align-items: flex-start;
  font-size: 15px; color: var(--c-text);
}
.feature-list li .check {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  display: grid; place-items: center;
  margin-top: 1px;
}
.feature-list li .check svg { width: 14px; height: 14px; }

.feature-visual {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 40px;
  min-height: 320px;
  display: grid; place-items: center;
  overflow: hidden;
}
.feature-visual.v-cyan { background: linear-gradient(135deg, #caf0f8, #00b4d8); }
.feature-visual.v-deep { background: linear-gradient(135deg, #023e8a, #00b4d8); }
.feature-visual.v-light { background: linear-gradient(135deg, #ffffff, #eef9fd); border: 1px solid var(--c-line); }
.feature-visual.v-mint { background: linear-gradient(135deg, #d1fae5, #48cae4); }
.feature-visual .big-icon {
  width: 140px; height: 140px;
  border-radius: 36px;
  background: rgba(255,255,255,.92);
  display: grid; place-items: center;
  box-shadow: var(--shadow-lg);
}
.feature-visual .big-icon svg { width: 76px; height: 76px; color: var(--c-primary-dark); }
.feature-visual.v-deep .big-icon svg { color: var(--c-deep); }
.feature-visual .deco-ring {
  position: absolute;
  border-radius: 50%;
  border: 2px dashed rgba(255,255,255,.5);
}
.feature-visual .deco-ring.r1 { width: 220px; height: 220px; top: -50px; right: -60px; }
.feature-visual .deco-ring.r2 { width: 160px; height: 160px; bottom: -40px; left: -40px; border-color: rgba(2,62,138,.2); }
.feature-visual .floating-stat {
  position: absolute;
  background: #fff;
  padding: 12px 16px;
  border-radius: 14px;
  box-shadow: var(--shadow);
  font-size: 13px;
  color: var(--c-ink);
  font-weight: 600;
  display: flex; align-items: center; gap: 8px;
}
.feature-visual .floating-stat .num { color: var(--c-primary-dark); font-size: 22px; font-weight: 800; }
.feature-visual .floating-stat.fs1 { top: 30px; right: 20px; }
.feature-visual .floating-stat.fs2 { bottom: 30px; left: 20px; }

/* ============================================================
   特性卡片网格
   ============================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.feature-card {
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all .25s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-card .ic {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--c-primary-soft);
  display: grid; place-items: center;
  margin-bottom: 20px;
}
.feature-card .ic svg { width: 30px; height: 30px; color: var(--c-primary-dark); }
.feature-card h3 { font-size: 20px; margin-bottom: 10px; }
.feature-card p { font-size: 14.5px; color: var(--c-muted); }

.feature-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.feature-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

/* ============================================================
   统计数据
   ============================================================ */
.stats-band {
  background: var(--grad-deep);
  color: #dcefff;
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}
.stats-band::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 15% 50%, rgba(0,180,216,.25), transparent 35%),
    radial-gradient(circle at 85% 50%, rgba(72,202,228,.18), transparent 35%);
}
.stats-grid {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}
.stat-item .num {
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
  line-height: 1.1;
}
.stat-item .num .unit { font-size: .55em; color: var(--c-primary-light); margin-left: 2px; }
.stat-item .label { font-size: 14px; color: #b6dcf2; margin-top: 8px; letter-spacing: 1px; }

/* ============================================================
   插件生态
   ============================================================ */
.plugin-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
.plugin-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.plugin-chip {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 14px;
  padding: 18px 12px;
  text-align: center;
  transition: all .25s ease;
  box-shadow: var(--shadow-sm);
}
.plugin-chip:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--c-primary-light); }
.plugin-chip .ic {
  width: 44px; height: 44px;
  border-radius: 12px;
  margin: 0 auto 10px;
  display: grid; place-items: center;
}
.plugin-chip .ic svg { width: 24px; height: 24px; color: #fff; }
.plugin-chip h4 { font-size: 13px; color: var(--c-ink); margin-bottom: 3px; }
.plugin-chip span { font-size: 11px; color: var(--c-muted); }

/* ============================================================
   下载 CTA
   ============================================================ */
.cta-band {
  background: var(--grad-deep);
  border-radius: var(--radius-lg);
  padding: 60px 56px;
  color: #fff;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-band::before {
  content: "";
  position: absolute;
  top: -80px; right: -80px;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,180,216,.5), transparent 70%);
}
.cta-band::after {
  content: "";
  position: absolute;
  bottom: -120px; left: -60px;
  width: 280px; height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(72,202,228,.35), transparent 70%);
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { color: #fff; font-size: clamp(26px, 3vw, 34px); margin-bottom: 10px; }
.cta-band p { color: #cfe8f7; font-size: 16px; max-width: 540px; }

/* ============================================================
   下载页 — 平台卡片
   ============================================================ */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.platform-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: all .25s ease;
  position: relative;
  overflow: hidden;
}
.platform-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--c-primary-light); }
.platform-card .ic {
  width: 88px; height: 88px;
  border-radius: 24px;
  background: var(--grad-cyan);
  display: grid; place-items: center;
  margin: 0 auto 22px;
  box-shadow: var(--shadow-primary);
}
.platform-card .ic svg { width: 46px; height: 46px; color: #fff; }
.platform-card h3 { font-size: 24px; margin-bottom: 6px; }
.platform-card .ver { font-size: 13px; color: var(--c-muted); margin-bottom: 18px; }
.platform-card .meta { font-size: 13px; color: var(--c-text); margin-bottom: 24px; display: flex; flex-direction: column; gap: 6px; }
.platform-card .meta-row { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px dashed var(--c-line); }
.platform-card .meta-row:last-child { border: none; }
.platform-card .meta-row span:first-child { color: var(--c-muted); }
.platform-card .meta-row span:last-child { color: var(--c-ink); font-weight: 600; }
.platform-card.featured { border-color: var(--c-primary); box-shadow: var(--shadow); }
.platform-card.featured::after {
  content: "推荐";
  position: absolute;
  top: 18px; right: -34px;
  background: var(--c-primary-dark);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 40px;
  transform: rotate(45deg);
}

/* ---------- 系统要求表 ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-line);
}
.spec-table th, .spec-table td {
  padding: 16px 22px;
  text-align: left;
  border-bottom: 1px solid var(--c-line);
}
.spec-table th {
  background: var(--c-bg-blue);
  color: var(--c-deep);
  font-weight: 700;
  font-size: 14px;
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table td { font-size: 14.5px; color: var(--c-text); }
.spec-table td:first-child { font-weight: 600; color: var(--c-ink); }
.spec-table .check-ic { color: var(--c-success); }
.spec-table .x-ic { color: var(--c-danger); }

/* ---------- 安装步骤 ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  position: relative;
}
.step-card {
  text-align: center;
  position: relative;
}
.step-card .num {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--grad-cyan);
  color: #fff;
  font-size: 24px; font-weight: 800;
  display: grid; place-items: center;
  margin: 0 auto 20px;
  box-shadow: var(--shadow-primary);
  position: relative;
  z-index: 1;
}
.step-card .visual {
  width: 100%;
  height: 180px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, #fff, var(--c-bg-blue));
  border: 1px solid var(--c-line);
  display: grid; place-items: center;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}
.step-card .visual svg { width: 70px; height: 70px; color: var(--c-primary-dark); }
.step-card h4 { font-size: 20px; margin-bottom: 10px; }
.step-card p { font-size: 14px; color: var(--c-muted); max-width: 280px; margin: 0 auto; }
.steps-grid::before {
  content: "";
  position: absolute;
  top: 28px;
  left: 16%; right: 16%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--c-primary-light) 0 8px, transparent 8px 16px);
  z-index: 0;
}

/* ---------- 更新日志 ---------- */
.changelog {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 8px 32px;
  box-shadow: var(--shadow-sm);
}
.changelog-item {
  padding: 26px 0;
  border-bottom: 1px solid var(--c-line);
  display: grid;
  grid-template-columns: 160px 1fr auto;
  gap: 30px;
  align-items: flex-start;
}
.changelog-item:last-child { border-bottom: none; }
.changelog-item .ver-block .ver {
  font-size: 22px; font-weight: 800; color: var(--c-deep);
}
.changelog-item .ver-block .date { font-size: 13px; color: var(--c-muted); }
.changelog-item ul { display: flex; flex-direction: column; gap: 8px; }
.changelog-item ul li {
  font-size: 14.5px; color: var(--c-text);
  position: relative; padding-left: 22px;
}
.changelog-item ul li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--c-primary);
}
.changelog-item ul li .tag {
  display: inline-block;
  font-size: 11px; font-weight: 700;
  padding: 2px 8px; border-radius: 4px;
  margin-right: 8px;
  vertical-align: middle;
}
.changelog-item ul li .tag.new { background: #d1fae5; color: #047857; }
.changelog-item ul li .tag.fix { background: #fef3c7; color: #b45309; }
.changelog-item ul li .tag.opt { background: var(--c-primary-soft); color: var(--c-primary-dark); }
.changelog-item .badge {
  font-size: 12px; padding: 4px 12px; border-radius: 999px;
  background: var(--c-primary-soft); color: var(--c-primary-dark);
  font-weight: 600; white-space: nowrap;
}

/* ============================================================
   插件中心
   ============================================================ */
.plugin-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 50px;
}
.cat-pill {
  padding: 10px 22px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--c-line);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text);
  cursor: pointer;
  transition: all .2s ease;
  display: flex; align-items: center; gap: 8px;
}
.cat-pill svg { width: 16px; height: 16px; }
.cat-pill:hover { border-color: var(--c-primary); color: var(--c-primary-dark); transform: translateY(-2px); }
.cat-pill.active {
  background: var(--grad-cyan);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-primary);
}
.cat-pill.active svg { color: #fff; }
.cat-pill .count { font-size: 11px; opacity: .7; }

.plugin-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.plugin-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  transition: all .25s ease;
  display: flex;
  flex-direction: column;
}
.plugin-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.plugin-card .head { display: flex; gap: 14px; align-items: center; margin-bottom: 14px; }
.plugin-card .ic {
  width: 54px; height: 54px;
  border-radius: 14px;
  display: grid; place-items: center;
  flex-shrink: 0;
}
.plugin-card .ic svg { width: 28px; height: 28px; color: #fff; }
.plugin-card .head h4 { font-size: 16px; margin-bottom: 2px; }
.plugin-card .head .author { font-size: 12px; color: var(--c-muted); }
.plugin-card .desc { font-size: 13.5px; color: var(--c-muted); margin-bottom: 16px; flex: 1; line-height: 1.6; }
.plugin-card .foot {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 14px; border-top: 1px solid var(--c-line);
}
.plugin-card .rating { display: flex; align-items: center; gap: 4px; font-size: 13px; color: var(--c-ink); font-weight: 600; }
.plugin-card .rating svg { width: 14px; height: 14px; color: #f59e0b; }
.plugin-card .installs { font-size: 12px; color: var(--c-muted); }
.plugin-card .btn-install {
  width: 100%;
  padding: 9px;
  margin-top: 14px;
  border-radius: 10px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  font-size: 13px; font-weight: 600;
  transition: all .2s ease;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.plugin-card .btn-install:hover { background: var(--grad-cyan); color: #fff; }
.plugin-card .btn-install svg { width: 14px; height: 14px; }

.plugin-tag {
  position: absolute;
  top: 12px; right: 12px;
  font-size: 10px; font-weight: 700;
  padding: 3px 8px; border-radius: 4px;
}
.plugin-card { position: relative; }
.plugin-tag.hot { background: #fee2e2; color: #dc2626; }
.plugin-tag.new { background: #d1fae5; color: #047857; }
.plugin-tag.pro { background: var(--c-primary-soft); color: var(--c-primary-dark); }

/* 热门推荐横幅 */
.hot-banner {
  background: linear-gradient(135deg, #023e8a, #00b4d8);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  color: #fff;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 30px;
  align-items: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 50px;
}
.hot-banner::before {
  content: ""; position: absolute;
  top: -60px; right: -60px;
  width: 240px; height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.18), transparent 70%);
}
.hot-banner h3 { color: #fff; font-size: 26px; margin-bottom: 10px; }
.hot-banner p { color: #cfe8f7; font-size: 15px; margin-bottom: 18px; }
.hot-banner .banner-stats { display: flex; gap: 24px; }
.hot-banner .banner-stats .num { font-size: 24px; font-weight: 800; color: #fff; }
.hot-banner .banner-stats .label { font-size: 12px; color: #b6dcf2; }
.hot-banner .banner-visual {
  display: grid; place-items: center;
}
.hot-banner .banner-visual .ic {
  width: 130px; height: 130px;
  border-radius: 30px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.3);
  display: grid; place-items: center;
  backdrop-filter: blur(10px);
}
.hot-banner .banner-visual .ic svg { width: 70px; height: 70px; color: #fff; }

/* ============================================================
   安全防护页
   ============================================================ */
.security-hero {
  background: var(--grad-deep);
  color: #dcefff;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}
.security-hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(0,180,216,.3), transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(72,202,228,.2), transparent 40%);
}
.security-hero .container { position: relative; z-index: 1; }
.security-hero h1 { color: #fff; font-size: clamp(32px, 4.4vw, 48px); margin-bottom: 18px; }
.security-hero p { color: #cfe8f7; font-size: 18px; max-width: 620px; }

.security-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 80px;
}
.security-feature:last-child { margin-bottom: 0; }
.security-visual {
  position: relative;
  min-height: 360px;
  border-radius: var(--radius-lg);
  display: grid; place-items: center;
  padding: 40px;
  overflow: hidden;
}
.security-visual.v-shield { background: linear-gradient(135deg, #023e8a, #00b4d8); }
.security-visual.v-sandbox { background: linear-gradient(135deg, #0077b6, #48cae4); }
.security-visual.v-track { background: linear-gradient(135deg, #03045e, #0077b6); }
.security-visual.v-malware { background: linear-gradient(135deg, #00b4d8, #90e0ef); }
.security-visual.v-sync { background: linear-gradient(135deg, #023e8a, #48cae4); }
.security-visual .center-ic {
  width: 130px; height: 130px;
  border-radius: 32px;
  background: rgba(255,255,255,.95);
  display: grid; place-items: center;
  box-shadow: var(--shadow-lg);
  position: relative; z-index: 1;
}
.security-visual .center-ic svg { width: 68px; height: 68px; color: var(--c-deep); }
.security-visual .ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.25);
}
.security-visual .ring.r1 { width: 240px; height: 240px; }
.security-visual .ring.r2 { width: 320px; height: 320px; border-style: dashed; }
.security-visual .orbit {
  position: absolute;
  width: 240px; height: 240px;
  border-radius: 50%;
  animation: spin 18s linear infinite;
}
.security-visual .orbit .dot {
  position: absolute;
  top: -10px; left: 50%;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 16px rgba(255,255,255,.6);
  transform: translateX(-50%);
}
@keyframes spin { to { transform: rotate(360deg); } }

.security-copy .eyebrow { margin-bottom: 14px; }
.security-copy h3 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 16px; }
.security-copy > p { font-size: 16px; color: var(--c-muted); margin-bottom: 22px; }
.security-points { display: flex; flex-direction: column; gap: 16px; }
.security-points .point {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 16px 18px;
  background: var(--c-bg-soft);
  border-radius: 12px;
  border-left: 3px solid var(--c-primary);
}
.security-points .point .ic {
  flex-shrink: 0;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  display: grid; place-items: center;
}
.security-points .point .ic svg { width: 20px; height: 20px; }
.security-points .point h4 { font-size: 15px; margin-bottom: 4px; }
.security-points .point p { font-size: 13.5px; color: var(--c-muted); margin: 0; }

/* 认证徽章 */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.cert-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
  transition: all .25s ease;
}
.cert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.cert-card .seal {
  width: 72px; height: 72px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  border: 3px solid var(--c-primary);
  background: var(--c-primary-soft);
  position: relative;
}
.cert-card .seal svg { width: 34px; height: 34px; color: var(--c-primary-dark); }
.cert-card .seal::after {
  content: ""; position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px dashed var(--c-primary-light);
}
.cert-card h4 { font-size: 15px; margin-bottom: 4px; }
.cert-card p { font-size: 12px; color: var(--c-muted); }

/* 白皮书下载卡 */
.whitepaper-card {
  background: linear-gradient(135deg, #023e8a, #0077b6);
  border-radius: var(--radius-lg);
  padding: 48px;
  color: #fff;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.whitepaper-card::before {
  content: ""; position: absolute;
  bottom: -80px; right: 200px;
  width: 260px; height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,180,216,.4), transparent 70%);
}
.whitepaper-card .info { position: relative; z-index: 1; }
.whitepaper-card h3 { color: #fff; font-size: 28px; margin-bottom: 12px; }
.whitepaper-card p { color: #cfe8f7; margin-bottom: 20px; max-width: 540px; }
.whitepaper-card .meta { display: flex; gap: 24px; font-size: 13px; color: #b6dcf2; margin-bottom: 24px; }
.whitepaper-card .meta span { display: flex; align-items: center; gap: 6px; }
.whitepaper-card .doc {
  width: 160px;
  position: relative; z-index: 1;
}
.whitepaper-card .doc-paper {
  background: #fff;
  border-radius: 6px;
  padding: 24px 16px;
  box-shadow: var(--shadow-lg);
  transform: rotate(4deg);
  position: relative;
}
.whitepaper-card .doc-paper::before {
  content: "PDF";
  position: absolute;
  top: 8px; right: 8px;
  background: #dc2626;
  color: #fff;
  font-size: 10px; font-weight: 700;
  padding: 2px 6px; border-radius: 3px;
}
.whitepaper-card .doc-paper .lines {
  display: flex; flex-direction: column; gap: 6px;
}
.whitepaper-card .doc-paper .lines i {
  height: 6px; background: var(--c-line); border-radius: 2px;
}
.whitepaper-card .doc-paper .lines i:nth-child(1) { width: 80%; background: var(--c-deep); }
.whitepaper-card .doc-paper .lines i:nth-child(2) { width: 60%; }
.whitepaper-card .doc-paper .lines i:nth-child(3) { width: 90%; }
.whitepaper-card .doc-paper .lines i:nth-child(4) { width: 70%; }
.whitepaper-card .doc-paper .lines i:nth-child(5) { width: 50%; }

/* ============================================================
   教程页
   ============================================================ */
.tut-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 50px;
}
.tut-tab {
  padding: 10px 22px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--c-line);
  font-size: 14px; font-weight: 500;
  color: var(--c-text);
  cursor: pointer;
  transition: all .2s ease;
}
.tut-tab.active {
  background: var(--grad-cyan); color: #fff; border-color: transparent;
  box-shadow: var(--shadow-primary);
}
.tut-tab:hover:not(.active) { border-color: var(--c-primary); color: var(--c-primary-dark); }

.tut-step-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.tut-step {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 20px;
  transition: all .25s ease;
}
.tut-step:hover { box-shadow: var(--shadow); transform: translateY(-3px); border-color: transparent; }
.tut-step .num {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--grad-cyan);
  color: #fff;
  font-size: 18px; font-weight: 800;
  display: grid; place-items: center;
  box-shadow: var(--shadow-primary);
}
.tut-step h4 { font-size: 17px; margin-bottom: 8px; }
.tut-step p { font-size: 14px; color: var(--c-muted); }
.tut-step .visual {
  margin-top: 16px;
  height: 100px;
  border-radius: 10px;
  background: linear-gradient(180deg, #fff, var(--c-bg-blue));
  border: 1px dashed var(--c-primary-light);
  display: grid; place-items: center;
}
.tut-step .visual svg { width: 40px; height: 40px; color: var(--c-primary); opacity: .6; }

/* 快捷键表 */
.shortcut-section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.shortcut-group {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px 30px;
  box-shadow: var(--shadow-sm);
}
.shortcut-group h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--c-bg-blue);
}
.shortcut-group h3 svg { width: 22px; height: 22px; color: var(--c-primary-dark); }
.shortcut-list { display: flex; flex-direction: column; gap: 10px; }
.shortcut-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 9px 0;
  border-bottom: 1px dashed var(--c-line);
  font-size: 14px;
}
.shortcut-list li:last-child { border: none; }
.shortcut-list li .desc { color: var(--c-text); }
.shortcut-list li .keys { display: flex; gap: 5px; }
.kbd {
  background: var(--c-bg-blue);
  border: 1px solid var(--c-line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 3px 9px;
  font-size: 12px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  color: var(--c-deep);
  font-weight: 600;
  min-width: 28px;
  text-align: center;
}

/* 视频教程卡片 */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.video-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all .25s ease;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  display: grid; place-items: center;
  overflow: hidden;
}
.video-thumb.v1 { background: linear-gradient(135deg, #023e8a, #00b4d8); }
.video-thumb.v2 { background: linear-gradient(135deg, #0077b6, #48cae4); }
.video-thumb.v3 { background: linear-gradient(135deg, #03045e, #0077b6); }
.video-thumb.v4 { background: linear-gradient(135deg, #00b4d8, #90e0ef); }
.video-thumb.v5 { background: linear-gradient(135deg, #023e8a, #48cae4); }
.video-thumb.v6 { background: linear-gradient(135deg, #0077b6, #00b4d8); }
.video-thumb::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,.2), transparent 50%);
}
.video-thumb .play {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: rgba(255,255,255,.95);
  display: grid; place-items: center;
  box-shadow: var(--shadow);
  position: relative; z-index: 1;
  transition: transform .25s ease;
}
.video-card:hover .video-thumb .play { transform: scale(1.1); }
.video-thumb .play svg { width: 28px; height: 28px; color: var(--c-primary-dark); margin-left: 3px; }
.video-thumb .duration {
  position: absolute;
  bottom: 10px; right: 10px;
  background: rgba(0,0,0,.6);
  color: #fff;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  z-index: 1;
}
.video-thumb .deco-icon {
  position: absolute;
  opacity: .15;
  z-index: 0;
}
.video-thumb .deco-icon svg { width: 120px; height: 120px; color: #fff; }
.video-body { padding: 18px 20px 22px; }
.video-body .tag {
  font-size: 11px; font-weight: 700;
  color: var(--c-primary-dark);
  background: var(--c-primary-soft);
  padding: 3px 9px; border-radius: 4px;
  display: inline-block;
  margin-bottom: 8px;
}
.video-body h4 { font-size: 16px; margin-bottom: 6px; line-height: 1.4; }
.video-body .meta { font-size: 12px; color: var(--c-muted); display: flex; gap: 14px; }

/* 进阶技巧 */
.tip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.tip-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 26px;
  border-top: 3px solid var(--c-primary);
  transition: all .25s ease;
}
.tip-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.tip-card .ic {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  display: grid; place-items: center;
  margin-bottom: 16px;
}
.tip-card .ic svg { width: 26px; height: 26px; }
.tip-card h4 { font-size: 17px; margin-bottom: 8px; }
.tip-card p { font-size: 13.5px; color: var(--c-muted); margin-bottom: 12px; }
.tip-card .code {
  background: var(--c-deep-2);
  color: #7dd3fc;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  padding: 8px 12px;
  border-radius: 6px;
  display: inline-block;
}

/* ============================================================
   FAQ 页
   ============================================================ */
.faq-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: flex-start;
}
.faq-cats {
  position: sticky;
  top: 90px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow-sm);
}
.faq-cats a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--c-text);
  font-weight: 500;
  transition: all .2s ease;
}
.faq-cats a svg { width: 18px; height: 18px; color: var(--c-muted); }
.faq-cats a:hover { background: var(--c-bg-blue); color: var(--c-deep); }
.faq-cats a.active { background: var(--c-primary-soft); color: var(--c-primary-dark); font-weight: 600; }
.faq-cats a.active svg { color: var(--c-primary-dark); }

.faq-cat-block { margin-bottom: 50px; }
.faq-cat-block:last-child { margin-bottom: 0; }
.faq-cat-block > h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 22px;
  padding-bottom: 14px;
  margin-bottom: 22px;
  border-bottom: 2px solid var(--c-bg-blue);
}
.faq-cat-block > h3 svg { width: 26px; height: 26px; color: var(--c-primary-dark); }

.faq-item {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: all .2s ease;
}
.faq-item:hover { border-color: var(--c-primary-light); }
.faq-item[open] { border-color: var(--c-primary); box-shadow: var(--shadow-sm); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--c-ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .q-ic {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  display: grid; place-items: center;
  font-size: 14px; font-weight: 800;
  margin-right: 4px;
}
.faq-item summary .chev {
  flex-shrink: 0;
  width: 24px; height: 24px;
  color: var(--c-muted);
  transition: transform .25s ease;
}
.faq-item[open] summary .chev { transform: rotate(180deg); }
.faq-item summary .q-text { flex: 1; }
.faq-item .answer {
  padding: 0 22px 22px 54px;
  font-size: 14.5px;
  color: var(--c-text);
  line-height: 1.8;
}
.faq-item .answer p { margin-bottom: 10px; }
.faq-item .answer p:last-child { margin-bottom: 0; }
.faq-item .answer .note {
  background: var(--c-bg-blue);
  border-left: 3px solid var(--c-primary);
  padding: 12px 16px;
  border-radius: 6px;
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--c-deep);
}

/* FAQ 联系卡 */
.faq-contact {
  background: linear-gradient(135deg, var(--c-primary-soft), #fff);
  border: 1px solid var(--c-primary-light);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  margin-top: 50px;
}
.faq-contact h3 { font-size: 22px; margin-bottom: 6px; }
.faq-contact p { color: var(--c-muted); font-size: 14.5px; }

/* ============================================================
   关于页
   ============================================================ */
.about-hero {
  background: var(--grad-deep);
  color: #dcefff;
  padding: 80px 0 90px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.about-hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(0,180,216,.4), transparent 50%);
}
.about-hero .container { position: relative; z-index: 1; }
.about-hero h1 { color: #fff; font-size: clamp(34px, 4.6vw, 50px); margin-bottom: 18px; }
.about-hero p { color: #cfe8f7; font-size: 18px; max-width: 680px; margin: 0 auto; }
.about-hero .values {
  display: flex; justify-content: center; gap: 14px; flex-wrap: wrap;
  margin-top: 30px;
}
.about-hero .value-pill {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.25);
  padding: 8px 20px; border-radius: 999px;
  font-size: 14px; color: #fff;
  backdrop-filter: blur(8px);
}

.timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: ""; position: absolute;
  left: 12px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-primary-light));
}
.timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute;
  left: -34px; top: 4px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--c-primary);
  box-shadow: 0 0 0 4px var(--c-primary-soft);
}
.timeline-item .year {
  display: inline-block;
  font-size: 13px; font-weight: 700;
  color: var(--c-primary-dark);
  background: var(--c-primary-soft);
  padding: 3px 12px; border-radius: 999px;
  margin-bottom: 8px;
}
.timeline-item h4 { font-size: 18px; margin-bottom: 8px; }
.timeline-item p { font-size: 14.5px; color: var(--c-muted); }

/* 团队 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.team-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 30px 22px;
  text-align: center;
  transition: all .25s ease;
}
.team-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.team-card .avatar {
  width: 90px; height: 90px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  font-size: 32px; font-weight: 800;
  color: #fff;
}
.team-card h4 { font-size: 17px; margin-bottom: 3px; }
.team-card .role { font-size: 13px; color: var(--c-primary-dark); font-weight: 600; margin-bottom: 10px; }
.team-card .bio { font-size: 13px; color: var(--c-muted); }

/* 开源贡献 */
.opensource-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.opensource-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.opensource-stats .stat {
  background: var(--c-bg-soft);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
}
.opensource-stats .stat .num {
  font-size: 28px; font-weight: 800;
  color: var(--c-primary-dark);
}
.opensource-stats .stat .label { font-size: 13px; color: var(--c-muted); }

/* 联系方式 */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.contact-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  transition: all .25s ease;
}
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.contact-card .ic {
  width: 60px; height: 60px;
  border-radius: 16px;
  background: var(--grad-cyan);
  display: grid; place-items: center;
  margin: 0 auto 18px;
  box-shadow: var(--shadow-primary);
}
.contact-card .ic svg { width: 30px; height: 30px; color: #fff; }
.contact-card h4 { font-size: 18px; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--c-muted); margin-bottom: 4px; }
.contact-card .value { font-size: 16px; color: var(--c-deep); font-weight: 600; }

/* ============================================================
   页脚
   ============================================================ */
.footer {
  background: var(--c-deep-2);
  color: #97b6d8;
  padding: 70px 0 30px;
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: ""; position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad-cyan);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 50px;
  margin-bottom: 50px;
}
.footer-brand .brand { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-bottom: 20px; max-width: 320px; }
.footer-brand .socials { display: flex; gap: 10px; }
.footer-brand .socials a {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,.08);
  display: grid; place-items: center;
  color: #cfe8f7;
  transition: all .2s ease;
}
.footer-brand .socials a:hover { background: var(--c-primary); color: #fff; transform: translateY(-2px); }
.footer-brand .socials a svg { width: 18px; height: 18px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 18px; letter-spacing: .5px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a { color: #97b6d8; font-size: 14px; }
.footer-col ul a:hover { color: var(--c-primary-light); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 26px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 14px;
  font-size: 13px;
}
.footer-bottom .links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-bottom .links a { color: #97b6d8; }
.footer-bottom .links a:hover { color: var(--c-primary-light); }
.footer-bottom .icp { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.footer-bottom .icp span { display: flex; align-items: center; gap: 5px; }
.footer-bottom .icp svg { width: 14px; height: 14px; }

/* ============================================================
   页面通用 Hero（内页顶部）
   ============================================================ */
.page-hero {
  background: var(--grad-deep);
  color: #dcefff;
  padding: 70px 0 80px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(0,180,216,.35), transparent 40%),
    radial-gradient(circle at 10% 90%, rgba(72,202,228,.2), transparent 40%);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero .breadcrumb { font-size: 13px; color: #b6dcf2; margin-bottom: 16px; }
.page-hero .breadcrumb a { color: var(--c-primary-light); }
.page-hero h1 { color: #fff; font-size: clamp(30px, 4vw, 44px); margin-bottom: 14px; letter-spacing: -.5px; }
.page-hero p { color: #cfe8f7; font-size: 17px; max-width: 680px; }
.page-hero .hero-deco-svg {
  position: absolute;
  right: 5%; top: 50%;
  transform: translateY(-50%);
  opacity: .15;
  z-index: 0;
}
.page-hero .hero-deco-svg svg { width: 280px; height: 280px; color: #fff; }

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; }
.wrap { flex-wrap: wrap; }
.hide-mobile { display: initial; }
.show-mobile { display: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .feature-row, .feature-row.flip .feature-visual { grid-template-columns: 1fr; gap: 30px; }
  .feature-row.flip .feature-visual { order: 0; }
  .feature-grid, .feature-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .plugin-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 36px; }
  .platform-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
  .steps-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
  .steps-grid::before { display: none; }
  .security-feature, .plugin-showcase { grid-template-columns: 1fr; gap: 30px; }
  .cert-grid, .tip-grid, .video-grid, .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .whitepaper-card, .opensource-card, .cta-band, .hot-banner { grid-template-columns: 1fr; padding: 36px; }
  .changelog-item { grid-template-columns: 1fr; gap: 12px; }
  .changelog-item .badge { justify-self: start; }
  .shortcut-section, .tut-step-list { grid-template-columns: 1fr; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-cats { position: static; display: flex; flex-wrap: wrap; gap: 6px; }
  .faq-cats a { flex: 1; min-width: 120px; justify-content: center; }
  .page-hero .hero-deco-svg { display: none; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h); left: 0; right: 0;
    background: #fff;
    padding: 16px;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--c-line);
    gap: 4px;
  }
  .nav-links.open a { width: 100%; }
  .section { padding: 60px 0; }
  .hero { padding: 50px 0 60px; }
  .hero-cta .btn { flex: 1; }
  .feature-grid, .plugin-grid, .cert-grid, .tip-grid, .video-grid, .contact-grid,
  .team-grid, .stats-grid, .bs-shortcuts { grid-template-columns: 1fr 1fr; }
  .bs-shortcuts { grid-template-columns: repeat(4, 1fr); }
  .container, .container-wide { padding: 0 18px; }
  .browser-mock { transform: none; }
  .browser-mock:hover { transform: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .opensource-stats { grid-template-columns: 1fr; }
  .hide-mobile { display: none; }
  .show-mobile { display: initial; }
  .cta-band { flex-direction: column; text-align: center; }
  .changelog { padding: 8px 18px; }
}

@media (max-width: 480px) {
  .feature-grid, .plugin-grid, .cert-grid, .tip-grid, .video-grid,
  .contact-grid, .team-grid, .stats-grid, .plugin-board { grid-template-columns: 1fr; }
  .bs-shortcuts { grid-template-columns: repeat(2, 1fr); }
  .hero-copy h1 { font-size: 32px; }
  .section-head h2 { font-size: 26px; }
  .platform-card, .step-card { padding: 24px; }
}