/* ============================================================
   星澜科技 · 软件下载站 全局样式
   设计系统：清爽蓝白科技风 / Noto Sans SC
   ============================================================ */

:root {
  --blue: #2563EB;
  --blue-dark: #1D4ED8;
  --blue-soft: #EAF1FE;
  --cyan: #06B6D4;
  --cyan-soft: #E7F9FC;
  --ink: #14233D;
  --ink-2: #4A5874;
  --ink-3: #8A97AF;
  --bg: #F5F8FD;
  --surface: #FFFFFF;
  --line: #E3E9F4;
  --navy: #0B1B33;
  --navy-2: #10264A;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(20, 35, 61, 0.05), 0 2px 10px rgba(20, 35, 61, 0.04);
  --shadow-md: 0 8px 28px rgba(20, 35, 61, 0.09);
  --shadow-lg: 0 18px 48px rgba(20, 35, 61, 0.14);
  --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --container: 1160px;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }
p { margin: 0 0 1em; }
h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.3; font-weight: 700; color: var(--ink); }
h1 { font-size: 46px; letter-spacing: -0.5px; }
h2 { font-size: 32px; letter-spacing: -0.3px; }
h3 { font-size: 21px; }
h4 { font-size: 17px; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }
button { font-family: inherit; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 4px; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section-tight { padding: 64px 0; }

/* ---------- 通用组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--blue);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
}
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head p { color: var(--ink-2); margin-bottom: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, var(--blue) 0%, var(--blue-dark) 100%);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
}
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 10px 26px rgba(37, 99, 235, 0.36); }
.btn-ghost {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover { color: var(--blue); border-color: var(--blue); transform: translateY(-1px); }
.btn-dark {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.28);
}
.btn-dark:hover { color: #fff; background: rgba(255, 255, 255, 0.2); transform: translateY(-1px); }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-lg { padding: 16px 30px; font-size: 16px; border-radius: 12px; }
.btn .download-ico { animation: none; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
}
.badge-cyan { background: var(--cyan-soft); color: #0E7490; }
.badge-green { background: #E6F8EF; color: #047857; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .2s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand img { width: 36px; height: 36px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 17px; font-weight: 700; letter-spacing: 1px; }
.brand-text small { font-size: 10px; color: var(--ink-3); letter-spacing: 2.4px; font-weight: 500; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--ink-2);
  font-size: 15px;
  font-weight: 500;
  transition: color .15s ease, background .15s ease;
}
.main-nav a.nav-link:hover { color: var(--blue); background: var(--blue-soft); }
.main-nav a.nav-link.active { color: var(--blue); font-weight: 600; }
.main-nav .nav-cta { margin-left: 8px; }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; stroke: var(--ink); }

/* 移动端抽屉 */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 27, 51, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
  z-index: 70;
}
.drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  height: 100%;
  background: var(--surface);
  z-index: 80;
  transform: translateX(102%);
  transition: transform .28s cubic-bezier(.4, 0, .2, 1);
  display: flex;
  flex-direction: column;
  padding: 20px;
  box-shadow: var(--shadow-lg);
}
.drawer.open { transform: translateX(0); }
.drawer-overlay.open { opacity: 1; pointer-events: auto; }
.drawer .drawer-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.drawer .drawer-close {
  width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 9px;
  background: var(--surface); cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.drawer .drawer-close svg { width: 18px; height: 18px; stroke: var(--ink); }
.drawer a.drawer-link {
  display: block;
  padding: 13px 10px;
  border-radius: 10px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.drawer a.drawer-link:hover { color: var(--blue); background: var(--blue-soft); }
.drawer .drawer-cta { margin-top: 20px; width: 100%; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy); color: #B9C6DC; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 64px 0 48px;
}
.footer-brand .brand { color: #fff; margin-bottom: 16px; }
.footer-brand .brand:hover { color: #fff; }
.footer-brand .brand-text strong { color: #fff; }
.footer-brand .brand-text small { color: #6E7F9C; }
.footer-brand p { font-size: 14px; color: #8FA0BC; max-width: 300px; }
.footer-contact { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; }
.footer-contact li { display: flex; align-items: center; gap: 8px; font-size: 14px; color: #8FA0BC; }
.footer-contact svg { width: 15px; height: 15px; stroke: var(--cyan); flex: none; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-col a { color: #8FA0BC; font-size: 14px; transition: color .15s ease; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  color: #6E7F9C;
}
.footer-bottom a { color: #8FA0BC; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(680px 420px at 88% -10%, rgba(6, 182, 212, 0.16), transparent 65%),
    radial-gradient(760px 480px at -8% 12%, rgba(37, 99, 235, 0.14), transparent 60%),
    linear-gradient(180deg, #FBFDFF 0%, #F2F7FF 100%);
  border-bottom: 1px solid var(--line);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(720px 420px at 70% 30%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(720px 420px at 70% 30%, #000 30%, transparent 78%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
  padding: 88px 0 96px;
}
.hero-copy .hero-title { font-size: 50px; line-height: 1.22; margin-bottom: 20px; }
.hero-copy .hero-sub { font-size: 17px; color: var(--ink-2); max-width: 520px; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-meta { font-size: 13px; color: var(--ink-3); }
.hero-meta code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; color: var(--ink-2); background: rgba(37, 99, 235, 0.06); padding: 2px 6px; border-radius: 5px; }
.hero-visual { position: relative; }
.hero-shot {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(20, 35, 61, 0.08);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  background: #fff;
}
.hero-shot img { width: 100%; height: auto; }
.hero-float {
  position: absolute;
  left: -18px;
  bottom: -16px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 16px;
  box-shadow: var(--shadow-md);
}
.hero-float .dot { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--blue), var(--cyan)); display: flex; align-items: center; justify-content: center; flex: none; }
.hero-float .dot svg { width: 18px; height: 18px; stroke: #fff; }
.hero-float b { display: block; font-size: 14px; line-height: 1.3; }
.hero-float span { font-size: 12px; color: var(--ink-3); }

/* 统计条 */
.stats-band { border-bottom: 1px solid var(--line); background: var(--surface); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: 30px 24px;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: none; }
.stat b { display: block; font-size: 30px; font-weight: 700; color: var(--ink); line-height: 1.2; }
.stat b em { font-style: normal; color: var(--blue); }
.stat span { font-size: 13.5px; color: var(--ink-3); }

/* ---------- 产品卡片 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  display: flex;
  flex-direction: column;
  padding: 30px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(37, 99, 235, 0.35); }
.product-card .p-ico {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.p-ico svg { width: 26px; height: 26px; stroke: #fff; }
.p-ico.blue { background: linear-gradient(135deg, var(--blue), #4F7DF5); }
.p-ico.cyan { background: linear-gradient(135deg, #0891B2, #22D3EE); }
.p-ico.indigo { background: linear-gradient(135deg, #4F46E5, #818CF8); }
.product-card h3 { font-size: 19px; margin-bottom: 8px; }
.product-card p { font-size: 14.5px; color: var(--ink-2); margin-bottom: 18px; flex: 1; }
.product-card .p-feats { list-style: none; padding: 0; margin: 0 0 22px; display: grid; gap: 9px; }
.product-card .p-feats li { display: flex; align-items: flex-start; gap: 9px; font-size: 14px; color: var(--ink-2); }
.product-card .p-feats svg { width: 16px; height: 16px; stroke: var(--cyan); flex: none; margin-top: 4px; }
.card-link { font-size: 14.5px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.card-link svg { width: 15px; height: 15px; transition: transform .15s ease; }
.card-link:hover svg { transform: translateX(3px); }

/* ---------- 特性区 ---------- */
.features { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.feature-list { display: grid; gap: 26px; margin-top: 8px; }
.feature-item { display: flex; gap: 16px; }
.feature-item .f-ico {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  background: var(--blue-soft); color: var(--blue);
  display: flex; align-items: center; justify-content: center;
}
.feature-item .f-ico svg { width: 22px; height: 22px; stroke: currentColor; }
.feature-item h4 { margin-bottom: 4px; font-size: 16.5px; }
.feature-item p { font-size: 14.5px; color: var(--ink-2); margin: 0; }
.feature-shot {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}
.feature-shot img { width: 100%; height: auto; }

/* ---------- 深色 CTA ---------- */
.cta-band {
  position: relative;
  background:
    radial-gradient(560px 320px at 85% 10%, rgba(6, 182, 212, 0.22), transparent 65%),
    radial-gradient(640px 400px at 5% 90%, rgba(37, 99, 235, 0.30), transparent 60%),
    var(--navy);
  color: #fff;
  text-align: center;
}
.cta-inner { padding: 88px 24px; }
.cta-inner h2 { color: #fff; font-size: 36px; margin-bottom: 14px; }
.cta-inner p { color: #8FA0BC; max-width: 560px; margin: 0 auto 32px; font-size: 16px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-note { margin-top: 20px; font-size: 13px; color: #6E7F9C; }

/* ---------- 子页 Hero ---------- */
.page-hero {
  background:
    radial-gradient(600px 340px at 90% -20%, rgba(6, 182, 212, 0.14), transparent 62%),
    radial-gradient(640px 400px at -5% 0%, rgba(37, 99, 235, 0.13), transparent 58%),
    linear-gradient(180deg, #FBFDFF 0%, #F2F7FF 100%);
  border-bottom: 1px solid var(--line);
}
.page-hero-inner { padding: 64px 0 60px; }
.page-hero-inner .breadcrumb { font-size: 13.5px; color: var(--ink-3); margin-bottom: 14px; }
.page-hero-inner .breadcrumb a { color: var(--ink-3); }
.page-hero-inner .breadcrumb a:hover { color: var(--blue); }
.page-hero-inner h1 { font-size: 40px; margin-bottom: 12px; }
.page-hero-inner p { color: var(--ink-2); max-width: 620px; margin: 0; }

/* ---------- 产品详情页 ---------- */
.prod-block { padding: 84px 0; }
.prod-block + .prod-block { border-top: 1px solid var(--line); }
.prod-block:nth-of-type(even) .prod-split { direction: rtl; }
.prod-split > * { direction: ltr; }
.prod-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.prod-media { position: relative; }
.prod-media .shot {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}
.prod-media .shot img { width: 100%; height: auto; }
.prod-media .shot-tag {
  position: absolute;
  top: 14px;
  left: 14px;
}
.prod-copy .prod-title { display: flex; align-items: center; gap: 12px; font-size: 30px; margin-bottom: 14px; }
.prod-copy .prod-title .p-ico { margin: 0; width: 44px; height: 44px; border-radius: 12px; }
.prod-copy .prod-title .p-ico svg { width: 22px; height: 22px; }
.prod-copy > p { color: var(--ink-2); font-size: 15.5px; }
.prod-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 22px 0 28px; }
.prod-feat {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}
.prod-feat svg { width: 19px; height: 19px; stroke: var(--blue); flex: none; margin-top: 3px; }
.prod-feat b { display: block; font-size: 14.5px; margin-bottom: 2px; }
.prod-feat span { font-size: 13px; color: var(--ink-3); line-height: 1.5; }

/* ---------- 下载页 ---------- */
.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.platform-card { padding: 26px; display: flex; flex-direction: column; }
.platform-card .p-head { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.platform-card .p-head .os-ico {
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  background: var(--bg); border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; color: var(--ink);
}
.platform-card .p-head .os-ico svg { width: 24px; height: 24px; }
.platform-card .p-head h3 { margin: 0; font-size: 17px; }
.platform-card .p-head span { font-size: 12.5px; color: var(--ink-3); }
.platform-card .p-meta { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 8px; }
.platform-card .p-meta li { display: flex; justify-content: space-between; gap: 12px; font-size: 13.5px; color: var(--ink-2); }
.platform-card .p-meta li b { color: var(--ink); font-weight: 600; text-align: right; }
.platform-card .p-meta li code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11.5px; color: var(--ink-2); word-break: break-all; text-align: right; }
.platform-card .btn { margin-top: auto; width: 100%; }
.note-line { font-size: 13px; color: var(--ink-3); }
.note-line a { font-weight: 500; }

.verify-list { display: grid; gap: 12px; }
.verify-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
.verify-item .v-head { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.verify-item .v-head b { font-size: 14px; font-weight: 600; }
.verify-item .v-head span { font-size: 12.5px; color: var(--ink-3); }
.verify-item code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: var(--ink-2);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  overflow-wrap: anywhere;
  user-select: all;
}

/* ---------- 系统要求表格 ---------- */
.spec-table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); }
.spec-table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 14.5px; }
.spec-table colgroup col:nth-child(1) { width: 18%; }
.spec-table colgroup col:nth-child(2) { width: 52%; }
.spec-table colgroup col:nth-child(3) { width: 30%; }
.spec-table th {
  text-align: left;
  padding: 14px 18px;
  background: #F0F5FC;
  color: var(--ink);
  font-weight: 600;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.spec-table td { padding: 13px 18px; border-bottom: 1px solid var(--line); color: var(--ink-2); vertical-align: top; }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table td b { color: var(--ink); font-weight: 600; }

/* ---------- 时间轴（版本历史 / 里程碑） ---------- */
.timeline { display: grid; gap: 0; }
.tl-row {
  display: grid;
  grid-template-columns: 180px 56px 1fr;
  grid-template-rows: 1fr;
}
.tl-time { padding: 26px 0; text-align: right; }
.tl-time b { display: block; font-size: 17px; font-weight: 700; color: var(--ink); }
.tl-time span { font-size: 12.5px; color: var(--ink-3); }
.tl-axis { position: relative; display: flex; justify-content: center; }
.tl-axis::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(50% - 1px);
  width: 2px;
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.35), rgba(6, 182, 212, 0.35));
}
.tl-dot {
  position: relative;
  z-index: 1;
  align-self: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--surface);
  border: 4px solid var(--blue);
  box-shadow: 0 0 0 5px rgba(37, 99, 235, 0.12);
}
.tl-content { padding: 24px 0 30px; }
.tl-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  max-width: 640px;
}
.tl-card h4 { font-size: 16px; margin-bottom: 8px; }
.tl-card h4 span { font-size: 13px; font-weight: 500; color: var(--ink-3); margin-left: 10px; }
.tl-card ul { margin: 0; padding-left: 1.25em; }
.tl-card li { font-size: 14px; color: var(--ink-2); margin-bottom: 4px; }
.tl-card li:last-child { margin-bottom: 0; }
.tl-badge { display: inline-block; font-size: 12px; font-weight: 500; color: var(--blue); background: var(--blue-soft); border-radius: 999px; padding: 2px 10px; margin-bottom: 8px; }
.tl-card .chips { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- 手风琴（FAQ） ---------- */
.faq-group { margin-bottom: 44px; }
.faq-group h3 { font-size: 19px; margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.faq-group h3 svg { width: 20px; height: 20px; stroke: var(--blue); }
.faq-list { display: grid; gap: 12px; }
.faq-item { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; transition: border-color .2s ease; }
.faq-item.open { border-color: rgba(37, 99, 235, 0.4); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 20px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
}
.faq-q:hover { color: var(--blue); }
.faq-q .faq-ico { flex: none; width: 26px; height: 26px; border-radius: 8px; background: var(--blue-soft); display: flex; align-items: center; justify-content: center; transition: transform .25s ease, background .25s ease; }
.faq-q .faq-ico svg { width: 15px; height: 15px; stroke: var(--blue); }
.faq-item.open .faq-ico { transform: rotate(45deg); background: var(--blue); }
.faq-item.open .faq-ico svg { stroke: #fff; }
.faq-a-wrap { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .28s ease; }
.faq-item.open .faq-a-wrap { grid-template-rows: 1fr; }
.faq-a { overflow: hidden; }
.faq-a-inner { padding: 0 20px 18px; font-size: 14.5px; color: var(--ink-2); }
.faq-a-inner p { margin: 0; }
.faq-a-inner code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; background: var(--bg); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; }
.faq-a-inner a { font-weight: 500; }

/* ---------- 关于页 ---------- */
.about-intro { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.about-intro p { color: var(--ink-2); font-size: 15.5px; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.value-card { padding: 26px; }
.value-card .v-ico { width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.value-card .v-ico svg { width: 22px; height: 22px; stroke: #fff; }
.value-card h4 { font-size: 17px; margin-bottom: 8px; }
.value-card p { font-size: 14px; color: var(--ink-2); margin: 0; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact-card { padding: 24px; }
.contact-card .c-ico { width: 42px; height: 42px; border-radius: 11px; background: var(--blue-soft); color: var(--blue); display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.contact-card .c-ico svg { width: 21px; height: 21px; stroke: currentColor; }
.contact-card h4 { font-size: 15.5px; margin-bottom: 4px; }
.contact-card p { font-size: 14px; color: var(--ink-2); margin: 0; }
.contact-card p a { font-weight: 500; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 20px);
  background: var(--navy);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 13px 22px;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: min(92vw, 480px);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast svg { width: 18px; height: 18px; stroke: var(--cyan); flex: none; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease;
  z-index: 90;
}
.back-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-top svg { width: 20px; height: 20px; stroke: var(--ink); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .product-grid, .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { gap: 40px; padding: 72px 0 84px; }
  .hero-copy .hero-title { font-size: 42px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .tl-row { grid-template-columns: 150px 44px 1fr; }
}
@media (max-width: 860px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .hero-inner { grid-template-columns: 1fr; padding: 56px 0 72px; }
  .hero-copy .hero-title { font-size: 36px; }
  .hero-visual { order: 2; }
  .feature-split, .prod-split, .about-intro { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .stat { padding: 22px 18px; }
  .stat b { font-size: 26px; }
  .tl-row { grid-template-columns: 108px 36px 1fr; }
  .tl-time b { font-size: 15px; }
  .tl-content { padding-left: 6px; }
  .prod-feats { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .section { padding: 60px 0; }
  .container { padding: 0 18px; }
  h1 { font-size: 32px; }
  h2 { font-size: 26px; }
  .hero-copy .hero-title { font-size: 31px; }
  .product-grid, .platform-grid, .value-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .tl-row { grid-template-columns: 84px 30px 1fr; }
  .tl-time { padding-right: 0; }
  .tl-card { padding: 16px; }
  .hero-float { left: 10px; bottom: -14px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .page-hero-inner h1 { font-size: 32px; }
  .cta-inner h2 { font-size: 28px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}