/* ============================================================
   91网页浏览器免费版官网入口 - 共享样式表
   主色：科技蓝 #1e6fff / 深蓝渐变 #0a2a6b
   风格：现代科技感，毛玻璃导航，渐变 Hero + 网格光效
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --brand: #1e6fff;
  --brand-deep: #0a2a6b;
  --brand-dark: #061a4a;
  --brand-light: #4d8dff;
  --accent: #00d4ff;
  --accent-2: #7b5cff;
  --bg: #f5f8ff;
  --bg-alt: #eef3ff;
  --surface: #ffffff;
  --text: #1a2238;
  --text-soft: #4a5568;
  --text-mute: #8a96b3;
  --line: #e3e9f5;
  --shadow-sm: 0 2px 8px rgba(10, 42, 107, 0.06);
  --shadow-md: 0 10px 30px rgba(10, 42, 107, 0.10);
  --shadow-lg: 0 20px 60px rgba(10, 42, 107, 0.18);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --grad-hero: linear-gradient(135deg, #0a2a6b 0%, #1e6fff 55%, #2d7bff 100%);
  --grad-cta: linear-gradient(135deg, #1e6fff 0%, #00d4ff 100%);
  --grad-card: linear-gradient(135deg, rgba(30,111,255,0.10) 0%, rgba(0,212,255,0.06) 100%);
  --maxw: 1200px;
}

/* ---------- 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, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 84px 0; }
.section--alt { background: var(--bg-alt); }
.section--dark {
  background: linear-gradient(180deg, var(--brand-dark) 0%, var(--brand-deep) 100%);
  color: #dce6ff;
}
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--brand);
  background: rgba(30,111,255,0.10);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.section--dark .section-head .eyebrow {
  color: var(--accent);
  background: rgba(0,212,255,0.14);
}
.section-head h2 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: var(--text);
}
.section--dark .section-head h2 { color: #fff; }
.section-head p { color: var(--text-soft); font-size: 16px; }
.section--dark .section-head p { color: #b9c8e8; }

/* ---------- 顶部毛玻璃导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(227, 233, 245, 0.7);
  transition: box-shadow .3s ease;
}
.nav.scrolled { box-shadow: var(--shadow-sm); }
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 17px;
  color: var(--text);
  white-space: nowrap;
}
.brand__logo {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--grad-cta);
  display: grid; place-items: center;
  color: #fff;
  box-shadow: 0 6px 14px rgba(30,111,255,0.35);
}
.brand__logo svg { width: 20px; height: 20px; }
.brand__name b { color: var(--brand); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav__links a {
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: 8px;
  transition: all .2s ease;
  white-space: nowrap;
}
.nav__links a:hover { color: var(--brand); background: rgba(30,111,255,0.08); }
.nav__links a.active { color: var(--brand); background: rgba(30,111,255,0.10); }
.nav__cta {
  background: var(--grad-cta);
  color: #fff !important;
  padding: 9px 20px !important;
  border-radius: 999px !important;
  font-weight: 600 !important;
  box-shadow: 0 6px 16px rgba(30,111,255,0.30);
}
.nav__cta:hover { transform: translateY(-1px); background: var(--grad-cta); }

/* 汉堡按钮 */
.nav__toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  position: relative;
  background: rgba(30,111,255,0.08);
}
.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 18px; height: 2px;
  background: var(--brand);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: all .3s ease;
}
.nav__toggle span::before { transform: translate(-50%, -6px); }
.nav__toggle span::after  { transform: translate(-50%, 6px); }
#nav-toggle:checked ~ .nav__inner .nav__toggle span { background: transparent; }
#nav-toggle:checked ~ .nav__inner .nav__toggle span::before { transform: translate(-50%, 0) rotate(45deg); }
#nav-toggle:checked ~ .nav__inner .nav__toggle span::after  { transform: translate(-50%, 0) rotate(-45deg); }
#nav-toggle { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn--primary {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 10px 24px rgba(30,111,255,0.35);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(30,111,255,0.45); }
.btn--ghost {
  background: rgba(255,255,255,0.10);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { background: rgba(255,255,255,0.18); }
.btn--soft {
  background: rgba(30,111,255,0.10);
  color: var(--brand);
}
.btn--soft:hover { background: rgba(30,111,255,0.18); }
.btn--lg { padding: 16px 34px; font-size: 16px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 140px 0 96px;
  background: var(--grad-hero);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 300px at 18% 20%, rgba(0,212,255,0.35), transparent 60%),
    radial-gradient(ellipse 500px 280px at 85% 30%, rgba(123,92,255,0.30), transparent 60%);
  z-index: -1;
}
.hero__inner {
  position: relative;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  backdrop-filter: blur(8px);
  margin-bottom: 26px;
}
.hero__badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #00ffa3;
  box-shadow: 0 0 10px #00ffa3;
}
.hero h1 {
  font-size: clamp(32px, 5.5vw, 56px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 18px;
  text-shadow: 0 6px 30px rgba(0,0,0,0.25);
}
.hero h1 .grad {
  background: linear-gradient(90deg, #00d4ff, #7bdfff 50%, #fff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__sub {
  font-size: clamp(16px, 2vw, 19px);
  color: #cfe0ff;
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.hero__meta {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  font-size: 13px;
  color: #b9c8e8;
  flex-wrap: wrap;
  justify-content: center;
}
.hero__meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero__meta svg { width: 15px; height: 15px; color: var(--accent); }

/* Hero 下方浏览器预览 */
.hero__preview {
  max-width: 980px;
  margin: 60px auto 0;
  padding: 0 24px;
}
.browser-mock {
  background: #fff;
  border-radius: 14px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.4);
  overflow: hidden;
  color: var(--text);
  transform: perspective(1400px) rotateX(6deg);
}
.browser-mock__bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: #f1f4fb;
  border-bottom: 1px solid var(--line);
}
.browser-mock__dots { display: flex; gap: 7px; }
.browser-mock__dots i { width: 12px; height: 12px; border-radius: 50%; display: block; }
.browser-mock__dots i:nth-child(1) { background: #ff5f57; }
.browser-mock__dots i:nth-child(2) { background: #febc2e; }
.browser-mock__dots i:nth-child(3) { background: #28c840; }
.browser-mock__url {
  flex: 1;
  background: #fff;
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--text-mute);
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
}
.browser-mock__url svg { width: 13px; height: 13px; color: #28c840; }
.browser-mock__body {
  height: 220px;
  background:
    radial-gradient(circle at 30% 30%, rgba(30,111,255,0.12), transparent 50%),
    radial-gradient(circle at 75% 60%, rgba(0,212,255,0.14), transparent 50%),
    linear-gradient(135deg, #f5f8ff, #eef3ff);
  position: relative;
}
.browser-mock__body::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(30,111,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,111,255,0.05) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* ---------- 功能卡片（三栏） ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad-cta);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card__icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--grad-card);
  display: grid; place-items: center;
  color: var(--brand);
  margin-bottom: 20px;
}
.feature-card__icon svg { width: 28px; height: 28px; }
.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card p {
  color: var(--text-soft);
  font-size: 15px;
  margin-bottom: 16px;
}
.feature-card__link {
  color: var(--brand);
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.feature-card__link svg { width: 14px; height: 14px; }

/* ---------- 数据统计条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat {
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.10);
}
.stat__num {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  background: linear-gradient(90deg, #00d4ff, #fff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
}
.stat__label {
  font-size: 14px;
  color: #b9c8e8;
  margin-top: 6px;
}

/* ---------- 平台支持 ---------- */
.platforms {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.platform {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 16px;
  text-align: center;
  transition: all .25s ease;
}
.platform:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.platform__icon {
  width: 52px; height: 52px;
  margin: 0 auto 14px;
  border-radius: 14px;
  background: var(--grad-card);
  display: grid; place-items: center;
  color: var(--brand);
}
.platform__icon svg { width: 26px; height: 26px; }
.platform h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.platform p { font-size: 12px; color: var(--text-mute); }

/* ---------- 用户评价 ---------- */
.reviews {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
}
.review__quote {
  position: absolute;
  top: 18px; right: 22px;
  font-size: 60px;
  font-family: Georgia, serif;
  color: rgba(30,111,255,0.10);
  line-height: 1;
}
.review__stars { color: #ffb020; font-size: 15px; margin-bottom: 12px; letter-spacing: 2px; }
.review__text { color: var(--text-soft); font-size: 15px; margin-bottom: 18px; }
.review__user { display: flex; align-items: center; gap: 12px; }
.review__avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--grad-cta);
  color: #fff;
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 16px;
}
.review__user b { font-size: 14px; display: block; }
.review__user span { font-size: 12px; color: var(--text-mute); }

/* ---------- CTA 下载区 ---------- */
.cta-box {
  position: relative;
  background: var(--grad-hero);
  border-radius: var(--radius-lg);
  padding: 60px 48px;
  text-align: center;
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.cta-box::before {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse 70% 80% at 50% 50%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 50% 50%, #000, transparent 75%);
}
.cta-box::after {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(ellipse 400px 200px at 20% 20%, rgba(0,212,255,0.35), transparent 60%);
}
.cta-box h2 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; margin-bottom: 14px; }
.cta-box p { color: #cfe0ff; margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-box .hero__actions { margin-bottom: 0; }

/* ---------- 页脚 ---------- */
.footer {
  background: #06122e;
  color: #9fb2d6;
  padding: 64px 0 28px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}
.footer__brand .brand { color: #fff; margin-bottom: 16px; }
.footer__brand .brand__name b { color: var(--accent); }
.footer__brand p { font-size: 14px; line-height: 1.8; max-width: 320px; }
.footer__social { display: flex; gap: 10px; margin-top: 18px; }
.footer__social a {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  display: grid; place-items: center;
  color: #9fb2d6;
  transition: all .25s ease;
}
.footer__social a:hover { background: var(--brand); color: #fff; transform: translateY(-2px); }
.footer__social svg { width: 18px; height: 18px; }
.footer__col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer__col li { margin-bottom: 10px; }
.footer__col a { font-size: 14px; transition: color .2s ease; }
.footer__col a:hover { color: var(--accent); }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}
.footer__bottom .links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer__bottom .links a:hover { color: var(--accent); }

/* ---------- 页面通用 hero（子页面） ---------- */
.page-hero {
  position: relative;
  background: var(--grad-hero);
  color: #fff;
  padding: 130px 0 70px;
  overflow: hidden;
  isolation: isolate;
}
.page-hero::before {
  content: "";
  position: absolute; inset: 0; z-index: -2;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 35%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 35%, transparent 80%);
}
.page-hero::after {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 500px 260px at 15% 20%, rgba(0,212,255,0.30), transparent 60%),
    radial-gradient(ellipse 420px 240px at 88% 30%, rgba(123,92,255,0.28), transparent 60%);
}
.page-hero__inner { max-width: 880px; margin: 0 auto; padding: 0 24px; text-align: center; }
.breadcrumb {
  font-size: 13px;
  color: #b9c8e8;
  margin-bottom: 18px;
  display: inline-flex;
  gap: 8px;
  align-items: center;
}
.breadcrumb a:hover { color: #fff; }
.page-hero h1 {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 14px;
}
.page-hero p { color: #cfe0ff; font-size: 17px; max-width: 620px; margin: 0 auto; }

/* ---------- 下载中心 ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.dl-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.dl-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.dl-card--featured {
  background: var(--grad-hero);
  color: #fff;
  border: none;
}
.dl-card--featured h3, .dl-card--featured .dl-card__size { color: #fff; }
.dl-card--featured .dl-card__icon { background: rgba(255,255,255,0.18); color: #fff; }
.dl-card--featured .dl-card__meta li { border-color: rgba(255,255,255,0.15); }
.dl-card--featured p { color: #cfe0ff; }
.dl-card__head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.dl-card__icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--grad-card);
  color: var(--brand);
  display: grid; place-items: center;
}
.dl-card__icon svg { width: 26px; height: 26px; }
.dl-card h3 { font-size: 20px; font-weight: 700; }
.dl-card__size { font-size: 13px; color: var(--text-mute); }
.dl-card p { color: var(--text-soft); font-size: 14px; margin-bottom: 18px; }
.dl-card__meta { margin-bottom: 22px; }
.dl-card__meta li {
  display: flex; justify-content: space-between;
  font-size: 13px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}
.dl-card__meta li:last-child { border-bottom: none; }
.dl-card__meta li span:first-child { color: var(--text-mute); }
.dl-card--featured .dl-card__meta li span:first-child { color: #cfe0ff; }
.dl-card .btn { width: 100%; justify-content: center; }
.dl-card--featured .btn--primary {
  background: #fff; color: var(--brand);
  box-shadow: 0 10px 24px rgba(0,0,0,0.20);
}

.release {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.release__head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.release__head h3 { font-size: 22px; font-weight: 800; }
.release__tag {
  background: rgba(0,200,120,0.10);
  color: #16a34a;
  font-size: 12px;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 999px;
}
.release__list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.release__list li:last-child { border-bottom: none; }
.release__list .icon {
  width: 22px; height: 22px;
  border-radius: 6px;
  background: rgba(30,111,255,0.10);
  color: var(--brand);
  display: grid; place-items: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.release__list .icon svg { width: 13px; height: 13px; }
.release__list b { font-size: 14px; }
.release__list p { font-size: 13px; color: var(--text-soft); }

.history-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.history-table th, .history-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.history-table th {
  background: var(--bg-alt);
  font-weight: 700;
  color: var(--text);
  font-size: 13px;
}
.history-table tr:last-child td { border-bottom: none; }
.history-table tr:hover td { background: rgba(30,111,255,0.03); }
.history-table .v { font-weight: 700; color: var(--brand); }
.history-table .badge {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 600;
}
.badge--stable { background: rgba(22,163,74,0.10); color: #16a34a; }
.badge--beta { background: rgba(251,188,44,0.15); color: #d97706; }
.badge--old { background: rgba(138,150,179,0.15); color: var(--text-mute); }

/* 安装步骤 */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  position: relative;
}
.step__num {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--grad-cta);
  color: #fff;
  display: grid; place-items: center;
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 18px;
  box-shadow: 0 8px 18px rgba(30,111,255,0.30);
}
.step h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--text-soft); }

/* ---------- 功能特色页 ---------- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 84px;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row--reverse .feature-row__media { order: 2; }
.feature-row__media {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  background: var(--grad-card);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.feature-row__media::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(30,111,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,111,255,0.06) 1px, transparent 1px);
  background-size: 26px 26px;
}
.feature-row__media svg.big { width: 100px; height: 100px; color: var(--brand); position: relative; z-index: 1; }
.feature-row__content .icon-sm {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--grad-cta);
  color: #fff;
  display: grid; place-items: center;
  margin-bottom: 18px;
}
.feature-row__content .icon-sm svg { width: 24px; height: 24px; }
.feature-row__content h3 { font-size: 26px; font-weight: 800; margin-bottom: 14px; }
.feature-row__content p { color: var(--text-soft); margin-bottom: 18px; }
.feature-row__content ul.checks li {
  display: flex; align-items: flex-start; gap: 10px;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--text);
}
.feature-row__content ul.checks svg { width: 18px; height: 18px; color: #16a34a; flex-shrink: 0; margin-top: 3px; }

/* ---------- 帮助中心：手风琴 ---------- */
.accordion { max-width: 860px; margin: 0 auto; }
.acc-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow .25s ease;
}
.acc-item:hover { box-shadow: var(--shadow-sm); }
.acc-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-weight: 600;
  font-size: 16px;
}
.acc-item summary::-webkit-details-marker { display: none; }
.acc-item summary .q-tag {
  font-size: 12px;
  color: var(--brand);
  background: rgba(30,111,255,0.10);
  padding: 3px 10px;
  border-radius: 999px;
  margin-right: 12px;
  font-weight: 600;
}
.acc-item summary .chev {
  width: 24px; height: 24px;
  color: var(--text-mute);
  transition: transform .25s ease;
  flex-shrink: 0;
}
.acc-item[open] summary .chev { transform: rotate(180deg); color: var(--brand); }
.acc-item .acc-body {
  padding: 0 24px 22px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.8;
}
.acc-item .acc-body code {
  background: var(--bg-alt);
  padding: 2px 7px;
  border-radius: 5px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--brand);
}

/* 帮助分类卡片 */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.guide-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  transition: all .25s ease;
}
.guide-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.guide-card__icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--grad-card);
  color: var(--brand);
  display: grid; place-items: center;
  margin-bottom: 16px;
}
.guide-card__icon svg { width: 24px; height: 24px; }
.guide-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.guide-card p { font-size: 13px; color: var(--text-soft); margin-bottom: 14px; }
.guide-card ul li { font-size: 13px; color: var(--text-soft); padding: 4px 0; display: flex; align-items: center; gap: 6px; }
.guide-card ul li::before { content: "›"; color: var(--brand); font-weight: 700; }

/* 快捷键表 */
.shortcut-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.shortcut-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.shortcut-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.shortcut-card h4 svg { width: 18px; height: 18px; color: var(--brand); }
.shortcut-card table { width: 100%; border-collapse: collapse; }
.shortcut-card td {
  padding: 9px 0;
  font-size: 14px;
  border-bottom: 1px dashed var(--line);
}
.shortcut-card tr:last-child td { border-bottom: none; }
.shortcut-card td:last-child { text-align: right; }
.kbd {
  display: inline-block;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 2px 9px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  color: var(--text);
  font-weight: 600;
  min-width: 22px;
  text-align: center;
}

/* 故障排查 */
.troubleshoot {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.ts-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius);
  padding: 24px;
}
.ts-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.ts-card .ts-step { font-size: 13px; color: var(--text-soft); margin-bottom: 10px; padding-left: 18px; position: relative; }
.ts-card .ts-step::before {
  content: counter(ts, decimal);
  counter-increment: ts;
  position: absolute;
  left: 0; top: 0;
  color: var(--brand);
  font-weight: 700;
}
.ts-card { counter-reset: ts; }

/* ---------- 关于我们 ---------- */
.story {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}
.story h2 { font-size: 32px; font-weight: 800; margin-bottom: 18px; }
.story p { color: var(--text-soft); margin-bottom: 16px; }
.story__media {
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.story__media::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 30px 30px;
}
.story__media .logo-big { width: 120px; height: 120px; color: rgba(255,255,255,0.95); position: relative; z-index: 1; }

/* 时间线 */
.timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding-left: 36px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 9px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
}
.tl-item { position: relative; padding-bottom: 38px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -36px; top: 4px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--brand);
  box-shadow: 0 0 0 4px rgba(30,111,255,0.15);
}
.tl-item .year {
  display: inline-block;
  font-weight: 800;
  color: var(--brand);
  font-size: 18px;
  margin-bottom: 4px;
}
.tl-item h4 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.tl-item p { color: var(--text-soft); font-size: 14px; }

/* 团队 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.team-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  text-align: center;
  transition: all .25s ease;
}
.team-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.team-card__avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--grad-cta);
  color: #fff;
  display: grid; place-items: center;
  font-weight: 800;
  font-size: 26px;
}
.team-card h4 { font-size: 17px; font-weight: 700; }
.team-card .role { font-size: 13px; color: var(--brand); font-weight: 600; margin-bottom: 10px; }
.team-card p { font-size: 13px; color: var(--text-soft); }

/* 使命愿景 */
.mv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.mv-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
}
.mv-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; width: 100%; height: 4px;
  background: var(--grad-cta);
}
.mv-card .icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--grad-card);
  color: var(--brand);
  display: grid; place-items: center;
  margin-bottom: 20px;
}
.mv-card .icon svg { width: 28px; height: 28px; }
.mv-card h3 { font-size: 22px; font-weight: 800; margin-bottom: 12px; }
.mv-card p { color: var(--text-soft); }

/* ---------- 资讯动态 ---------- */
.news-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
}
.news-list { display: flex; flex-direction: column; gap: 22px; }
.news-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all .25s ease;
}
.news-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: transparent; }
.news-item__thumb {
  aspect-ratio: 1;
  border-radius: var(--radius);
  background: var(--grad-card);
  display: grid; place-items: center;
  color: var(--brand);
  position: relative;
  overflow: hidden;
}
.news-item__thumb::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(30,111,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,111,255,0.06) 1px, transparent 1px);
  background-size: 14px 14px;
}
.news-item__thumb svg { width: 38px; height: 38px; position: relative; z-index: 1; }
.news-item__meta { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
}
.tag--product { background: rgba(30,111,255,0.10); color: var(--brand); }
.tag--update { background: rgba(0,200,120,0.10); color: #16a34a; }
.tag--event { background: rgba(251,188,44,0.15); color: #d97706; }
.tag--tech { background: rgba(123,92,255,0.12); color: #7b5cff; }
.news-item__date { font-size: 13px; color: var(--text-mute); }
.news-item h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.news-item h3 a:hover { color: var(--brand); }
.news-item p { font-size: 14px; color: var(--text-soft); margin-bottom: 12px; }
.news-item__more { color: var(--brand); font-size: 13px; font-weight: 600; display: inline-flex; align-items: center; gap: 4px; }

.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}
.sidebar-card h4 {
  font-size: 17px; font-weight: 700;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 8px;
}
.sidebar-card h4 svg { width: 18px; height: 18px; color: var(--brand); }
.hot-list li {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.hot-list li:last-child { border-bottom: none; }
.hot-list .rank {
  width: 24px; height: 24px;
  border-radius: 6px;
  background: var(--bg-alt);
  color: var(--text-mute);
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}
.hot-list li:nth-child(1) .rank { background: #ff4d4f; color: #fff; }
.hot-list li:nth-child(2) .rank { background: #ff7a45; color: #fff; }
.hot-list li:nth-child(3) .rank { background: #ffa940; color: #fff; }
.hot-list a { font-size: 14px; line-height: 1.5; }
.hot-list a:hover { color: var(--brand); }
.hot-list .views { font-size: 12px; color: var(--text-mute); margin-top: 4px; display: block; }

.cat-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  display: flex; justify-content: space-between;
  font-size: 14px;
}
.cat-list li:last-child { border-bottom: none; }
.cat-list li a:hover { color: var(--brand); }
.cat-list .count { color: var(--text-mute); font-size: 13px; }

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 36px;
}
.pagination a {
  min-width: 40px; height: 40px;
  padding: 0 14px;
  border-radius: 10px;
  display: grid; place-items: center;
  font-size: 14px;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text-soft);
  transition: all .2s ease;
}
.pagination a:hover { border-color: var(--brand); color: var(--brand); }
.pagination a.active { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ---------- 联系我们 ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
}
.contact-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.contact-form h3 { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.contact-form .sub { color: var(--text-soft); font-size: 14px; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}
.form-group label .req { color: #ff4d4f; }
.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  transition: all .2s ease;
}
.form-control:focus {
  outline: none;
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(30,111,255,0.12);
}
textarea.form-control { resize: vertical; min-height: 130px; }
select.form-control { appearance: none; cursor: pointer; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231e6fff' stroke-width='3'><polyline points='6 9 12 15 18 9'/></svg>"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }

.contact-info { display: flex; flex-direction: column; gap: 18px; }
.info-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.info-card .icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--grad-card);
  color: var(--brand);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.info-card .icon svg { width: 22px; height: 22px; }
.info-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.info-card p { font-size: 14px; color: var(--text-soft); }
.info-card a { color: var(--brand); font-weight: 600; }

.map-placeholder {
  aspect-ratio: 21/9;
  border-radius: var(--radius-lg);
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
  display: grid; place-items: center;
  color: #fff;
  border: 1px solid var(--line);
}
.map-placeholder::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}
.map-placeholder .pin { width: 64px; height: 64px; color: #fff; filter: drop-shadow(0 6px 14px rgba(0,0,0,0.3)); position: relative; z-index: 1; animation: bounce 2s infinite; }
.map-placeholder .label { position: relative; z-index: 1; margin-top: 10px; font-weight: 600; }
@keyframes bounce {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.social-row { display: flex; gap: 12px; flex-wrap: wrap; }
.social-row a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-soft);
  transition: all .2s ease;
}
.social-row a:hover { background: var(--brand); color: #fff; border-color: var(--brand); transform: translateY(-2px); }
.social-row a svg { width: 16px; height: 16px; }

/* ---------- 通用辅助 ---------- */
.page-body { padding: 70px 0 84px; }
.text-center { text-align: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.mt-0 { margin-top: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
  .news-layout { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 32px; }
  .feature-row--reverse .feature-row__media { order: 0; }
  .story { grid-template-columns: 1fr; }
  .cards-grid, .reviews, .dl-grid, .troubleshoot, .mv-grid, .grid-2 { grid-template-columns: 1fr 1fr; }
  .platforms { grid-template-columns: repeat(3, 1fr); }
  .stats { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .guide-grid { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .shortcut-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(18px);
    padding: 16px;
    gap: 4px;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height .3s ease, opacity .3s ease, padding .3s ease;
  }
  #nav-toggle:checked ~ .nav__inner .nav__links {
    max-height: 80vh;
    opacity: 1;
    pointer-events: auto;
    padding: 16px;
  }
  .nav__links a { padding: 12px 14px; }
  .nav__cta { text-align: center; }
  .section { padding: 60px 0; }
  .hero { padding: 120px 0 70px; }
  .page-hero { padding: 110px 0 56px; }
  .cta-box { padding: 44px 24px; }
  .cards-grid, .reviews, .dl-grid, .troubleshoot, .mv-grid, .grid-2, .stats, .steps, .guide-grid, .team-grid, .platforms, .form-row { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; }
  .news-item__thumb { aspect-ratio: 16/9; }
  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .hero__actions, .cta-box .hero__actions { flex-direction: column; }
  .hero__actions .btn, .cta-box .btn { width: 100%; justify-content: center; }
  .release, .contact-form { padding: 24px; }
  .feature-row__media { aspect-ratio: 16/10; }
}

@media (max-width: 420px) {
  .container, .nav__inner, .hero__inner { padding-left: 16px; padding-right: 16px; }
  .hero h1 { font-size: 30px; }
  .browser-mock__body { height: 160px; }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: #b9c8e8; border-radius: 10px; border: 2px solid var(--bg-alt); }
::-webkit-scrollbar-thumb:hover { background: var(--brand); }

/* ---------- 选中文本 ---------- */
::selection { background: rgba(30,111,255,0.25); color: var(--brand-deep); }