/* ==========================================================================
   会记帐 · 产品官网样式表
   设计基调：浅色 / 品牌蓝 #01458E / 红色点缀 #F4292C
   纯静态，无任何外部依赖，可直接放入 nginx 根目录
   ========================================================================== */

/* ---------- 1. 重置与基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI", "Microsoft YaHei",
               "Hiragino Sans GB", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-700);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--brand-700); text-decoration: none; }
a:hover { color: var(--brand-600); }
button { font: inherit; cursor: pointer; }

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink-900);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

::selection { background: var(--brand-800); color: #fff; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --brand-900: #01306A;
  --brand-800: #01458E;
  --brand-700: #0B5CB4;
  --brand-600: #1F7AE0;
  --brand-500: #3D93F0;
  --brand-100: #DCE9FA;
  --brand-50:  #EEF5FE;

  --accent: #F4292C;
  --accent-soft: #FFF0F0;
  --ok: #16A34A;
  --ok-soft: #ECFAF1;

  --ink-900: #0E1B2E;
  --ink-700: #33425B;
  --ink-500: #64748B;
  --ink-400: #8296AD;
  --line: #E4EBF4;
  --line-strong: #D3DEEE;

  --bg: #F6F9FD;
  --card: #FFFFFF;

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;
  --radius-xl: 30px;

  --shadow-xs: 0 1px 2px rgba(16, 38, 74, .05);
  --shadow-sm: 0 4px 14px rgba(16, 38, 74, .06);
  --shadow-md: 0 12px 32px rgba(16, 38, 74, .09);
  --shadow-lg: 0 26px 60px rgba(16, 38, 74, .14);
  --shadow-brand: 0 14px 30px rgba(1, 69, 142, .26);

  --header-h: 68px;

  --grad-brand: linear-gradient(135deg, #1F7AE0 0%, #0B5CB4 52%, #01458E 100%);
  --grad-soft: linear-gradient(160deg, #F2F8FF 0%, #F6F9FD 60%, #FFFFFF 100%);
}

/* ---------- 3. 布局 ---------- */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 88px 0; }
.section--tight { padding: 62px 0; }
.section--plain { background: #fff; }
.section--soft { background: var(--grad-soft); }
.section--dark {
  background: var(--grad-brand);
  color: rgba(255, 255, 255, .88);
}
.section--dark h2, .section--dark h3 { color: #fff; }

.section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.section-head--left { margin-left: 0; text-align: left; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 13px;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--brand-700);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  border-radius: 999px;
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.section--dark .eyebrow {
  color: #EAF3FF;
  background: rgba(255, 255, 255, .14);
  border-color: rgba(255, 255, 255, .26);
}

h1 { font-size: clamp(30px, 4.4vw, 52px); }
.section-title { font-size: clamp(24px, 3vw, 36px); }
.section-lead {
  margin-top: 16px;
  font-size: 17px;
  color: var(--ink-500);
}
.section--dark .section-lead { color: rgba(255, 255, 255, .82); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15.5px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn svg { width: 18px; height: 18px; flex: none; }

.btn--primary {
  color: #fff;
  background: var(--grad-brand);
  box-shadow: var(--shadow-brand);
}
.btn--primary:hover { color: #fff; box-shadow: 0 18px 38px rgba(1, 69, 142, .34); }

.btn--ghost {
  color: var(--brand-800);
  background: #fff;
  border-color: var(--line-strong);
  box-shadow: var(--shadow-xs);
}
.btn--ghost:hover { color: var(--brand-700); border-color: var(--brand-500); }

.btn--light {
  color: var(--brand-800);
  background: #fff;
  box-shadow: 0 10px 24px rgba(4, 24, 56, .18);
}
.btn--light:hover { color: var(--brand-900); }

.btn--onDark {
  color: #fff;
  border-color: rgba(255, 255, 255, .42);
}
.btn--onDark:hover { color: #fff; background: rgba(255, 255, 255, .14); }

.btn--sm { padding: 10px 18px; font-size: 14.5px; }
.btn--block { width: 100%; }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }
.btn-row--center { justify-content: center; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 15px;
}
.text-link::after {
  content: "";
  width: 16px; height: 8px;
  background: currentColor;
  clip-path: polygon(0 38%, 62% 38%, 62% 0, 100% 50%, 62% 100%, 62% 62%, 0 62%);
  transition: transform .18s ease;
}
.text-link:hover::after { transform: translateX(3px); }

/* ---------- 5. 页头导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--header-h);
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 100%;
}

.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand img, .brand svg { width: 36px; height: 36px; border-radius: 10px; }
.brand-name {
  font-size: 19px;
  font-weight: 800;
  color: var(--ink-900);
  letter-spacing: .01em;
}
.brand-name small {
  display: block;
  margin-top: -3px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--ink-400);
  text-transform: uppercase;
}

.nav { margin-left: auto; }
.nav ul { display: flex; align-items: center; gap: 4px; }
.nav a {
  display: block;
  padding: 9px 15px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-700);
}
.nav a:hover { color: var(--brand-800); background: var(--brand-50); }
.nav a.is-active { color: var(--brand-800); background: var(--brand-50); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  padding: 0;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px; height: 2px;
  margin: 0 auto;
  background: var(--ink-900);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle span { position: relative; }
.nav-toggle span::before,
.nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

/* ---------- 6. 首屏 Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 78px 0 92px;
  background:
    radial-gradient(900px 460px at 88% -8%, rgba(31, 122, 224, .16), transparent 62%),
    radial-gradient(760px 420px at 4% 8%, rgba(61, 147, 240, .12), transparent 60%),
    var(--grad-soft);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(1, 69, 142, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(1, 69, 142, .045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 70% 30%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 70% 30%, #000 0%, transparent 72%);
  pointer-events: none;
}
.hero > .container { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 470px);
  gap: 60px;
  align-items: center;
}
/* 栅格子元素默认 min-width:auto，长文本会把列撑破，必须显式归零 */
.hero-copy { min-width: 0; }

.hero h1 .hl {
  background: linear-gradient(180deg, transparent 62%, rgba(244, 41, 44, .22) 62%);
  padding: 0 2px;
}
.hero-sub {
  margin-top: 22px;
  font-size: 18px;
  color: var(--ink-500);
  max-width: 33em;
}
.hero .btn-row { margin-top: 32px; }

.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 26px;
  font-size: 14px;
  color: var(--ink-500);
}
.hero-note li { display: flex; align-items: center; gap: 7px; }
.hero-note svg { width: 15px; height: 15px; color: var(--ok); flex: none; }

/* 数据条 */
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 56px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.hero-metrics li {
  padding: 20px 22px;
  background: rgba(255, 255, 255, .78);
}
.hero-metrics b {
  display: block;
  font-size: 22px;
  font-weight: 800;
  color: var(--brand-800);
}
.hero-metrics span { font-size: 13.5px; color: var(--ink-500); }

/* ---------- 7. 手机模型 ---------- */
.device {
  position: relative;
  width: 300px;
  margin: 0 auto;
  padding: 12px;
  background: linear-gradient(160deg, #22303F, #101A26 60%, #1B2733);
  border-radius: 42px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, .12) inset;
}
.device::before {
  content: "";
  position: absolute;
  top: 12px; left: 50%;
  width: 96px; height: 22px;
  transform: translateX(-50%);
  background: #101A26;
  border-radius: 0 0 14px 14px;
  z-index: 3;
}
.device-screen {
  position: relative;
  overflow: hidden;
  padding: 34px 16px 18px;
  background: #F4F7FC;
  border-radius: 32px;
  aspect-ratio: 300 / 610;
}

.ds-status {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-900);
  opacity: .75;
}
.ds-balance {
  margin-top: 12px;
  padding: 18px;
  color: #fff;
  background: var(--grad-brand);
  border-radius: 18px;
  box-shadow: 0 12px 24px rgba(1, 69, 142, .28);
}
.ds-balance .label { font-size: 12px; opacity: .82; }
.ds-balance .value {
  margin-top: 4px;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -.02em;
}
.ds-balance .value i { font-style: normal; font-size: 17px; font-weight: 600; margin-right: 3px; opacity: .9; }
.ds-balance .split {
  display: flex;
  gap: 22px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, .26);
  font-size: 12.5px;
}
.ds-balance .split b { display: block; font-size: 15px; font-weight: 700; }
.ds-balance .split .inc { color: #B4F0C8; }
.ds-balance .split .exp { color: #FFC9C9; }

.ds-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 18px 2px 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-900);
}
.ds-title span { font-size: 11.5px; font-weight: 500; color: var(--ink-400); }

.ds-list { display: grid; gap: 7px; }
.ds-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  background: #fff;
  border-radius: 13px;
  box-shadow: var(--shadow-xs);
}
.ds-icon {
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  flex: none;
  font-size: 14px;
  background: var(--brand-50);
  border-radius: 9px;
}
.ds-item .name { font-size: 12.5px; font-weight: 600; color: var(--ink-900); }
.ds-item .time { font-size: 10.5px; color: var(--ink-400); }
.ds-item .amt { margin-left: auto; font-size: 13px; font-weight: 700; }
.ds-item .amt.exp { color: var(--ink-900); }
.ds-item .amt.inc { color: var(--ok); }

.ds-fab {
  position: absolute;
  right: 16px; bottom: 60px;
  display: grid;
  place-items: center;
  width: 50px; height: 50px;
  color: #fff;
  font-size: 26px;
  font-weight: 300;
  line-height: 1;
  background: var(--grad-brand);
  border-radius: 50%;
  box-shadow: var(--shadow-brand);
}
.ds-tabbar {
  position: absolute;
  left: 16px; right: 16px; bottom: 16px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 8px 0;
  background: rgba(255, 255, 255, .94);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.ds-tabbar div { font-size: 10px; color: var(--ink-400); }
.ds-tabbar div::before {
  content: "";
  display: block;
  width: 16px; height: 16px;
  margin: 0 auto 2px;
  background: currentColor;
  opacity: .55;
  border-radius: 4px;
}
.ds-tabbar .on { color: var(--brand-800); font-weight: 700; }
.ds-tabbar .on::before { opacity: 1; }

.device-float {
  position: absolute;
  padding: 10px 14px;
  background: #fff;
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-900);
  white-space: nowrap;
}
.device-float b { color: var(--brand-800); }
.device-float--a { top: 92px; left: -58px; }
.device-float--b { bottom: 132px; right: -66px; }
.device-float small { display: block; font-size: 11px; font-weight: 500; color: var(--ink-400); }

/* ---------- 8. 卡片栅格 ---------- */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  padding: 28px 26px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-100);
  box-shadow: var(--shadow-md);
}
.card h3 { font-size: 18px; }
.card p { margin-top: 9px; font-size: 15px; color: var(--ink-500); }
.card .icon {
  display: grid;
  place-items: center;
  width: 48px; height: 48px;
  margin-bottom: 18px;
  color: var(--brand-800);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  border-radius: 14px;
}
.card .icon svg { width: 24px; height: 24px; }
.card--accent .icon { color: var(--accent); background: var(--accent-soft); border-color: #FFD9D9; }

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}
.tag {
  padding: 3px 10px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--brand-700);
  background: var(--brand-50);
  border-radius: 999px;
}
.tag--ok { color: var(--ok); background: var(--ok-soft); }
.tag--exp { color: var(--accent); background: var(--accent-soft); }

/* ---------- 9. 双端协同 ---------- */
.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}
.panel {
  position: relative;
  overflow: hidden;
  padding: 34px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}
.panel-head { display: flex; align-items: center; gap: 14px; }
.panel-head .badge {
  display: grid;
  place-items: center;
  width: 46px; height: 46px;
  flex: none;
  color: #fff;
  background: var(--grad-brand);
  border-radius: 14px;
}
.panel-head .badge svg { width: 23px; height: 23px; }
.panel-head h3 { font-size: 19px; }
.panel-head span { font-size: 13.5px; color: var(--ink-400); }
.panel > p { margin-top: 16px; }
.panel-list { display: grid; gap: 11px; margin-top: 22px; }
.panel-list li {
  display: flex;
  gap: 10px;
  font-size: 15px;
  color: var(--ink-700);
}
.panel-list li::before {
  content: "";
  width: 18px; height: 18px;
  flex: none;
  margin-top: 4px;
  background: var(--brand-800);
  clip-path: polygon(42% 74%, 88% 22%, 96% 30%, 42% 90%, 6% 54%, 14% 46%);
}
.panel--web { background: linear-gradient(170deg, #F7FAFF, #fff 55%); }

/* 浏览器窗口示意 */
.browser {
  margin-top: 26px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
}
.browser-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  background: #F2F6FC;
  border-bottom: 1px solid var(--line);
}
.browser-bar i {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #D6DFEC;
}
.browser-bar i:nth-child(1) { background: #FCA5A5; }
.browser-bar i:nth-child(2) { background: #FCD34D; }
.browser-bar i:nth-child(3) { background: #86EFAC; }
.browser-url {
  margin-left: 8px;
  padding: 3px 12px;
  font-size: 11.5px;
  color: var(--ink-500);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.browser-body { display: grid; grid-template-columns: 108px 1fr; min-height: 246px; }
.browser-side {
  padding: 14px 10px;
  background: #F8FAFD;
  border-right: 1px solid var(--line);
}
.browser-side div {
  padding: 7px 10px;
  margin-bottom: 3px;
  font-size: 12px;
  color: var(--ink-500);
  border-radius: 8px;
}
.browser-side .on {
  color: var(--brand-800);
  font-weight: 700;
  background: var(--brand-50);
}
.browser-main { padding: 16px; }
.browser-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.browser-kpi {
  padding: 11px 12px;
  background: #F7FAFF;
  border: 1px solid var(--line);
  border-radius: 11px;
}
.browser-kpi span { font-size: 11px; color: var(--ink-400); }
.browser-kpi b {
  display: block;
  margin-top: 3px;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink-900);
}
.browser-kpi b.inc { color: var(--ok); }
.browser-kpi b.exp { color: var(--accent); }

.chart { margin-top: 14px; }
.chart svg { width: 100%; height: auto; }
.chart-legend {
  display: flex;
  gap: 18px;
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--ink-500);
}
.chart-legend i {
  display: inline-block;
  width: 9px; height: 9px;
  margin-right: 5px;
  border-radius: 3px;
  vertical-align: middle;
}
.chart-legend .l-inc i { background: var(--ok); }
.chart-legend .l-exp i { background: var(--accent); }

/* ---------- 10. 统计能力 ---------- */
.stat-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 44px;
  align-items: center;
  padding: 42px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}
.metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 26px; }
.metric {
  padding: 16px 18px;
  background: var(--brand-50);
  border-radius: 14px;
}
.metric span { font-size: 13px; color: var(--ink-500); }
.metric b {
  display: block;
  margin-top: 4px;
  font-size: 21px;
  font-weight: 800;
  color: var(--brand-800);
}
.metric b small { font-size: 13px; font-weight: 600; margin-left: 2px; }

.donut-wrap { display: grid; grid-template-columns: auto 1fr; gap: 26px; align-items: center; }
.donut { width: 172px; height: 172px; flex: none; }
.donut-legend { display: grid; gap: 9px; }
.donut-legend li {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
}
.donut-legend i { width: 10px; height: 10px; border-radius: 3px; }
.donut-legend b { font-weight: 700; color: var(--ink-900); }
.donut-legend em { font-style: normal; font-size: 12.5px; color: var(--ink-400); }

.bars { display: grid; gap: 12px; margin-top: 20px; }
.bar-row { display: grid; grid-template-columns: 62px 1fr 52px; align-items: center; gap: 12px; font-size: 13px; }
.bar-track { height: 9px; background: #EDF2F9; border-radius: 999px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 999px; background: var(--grad-brand); }
.bar-fill--warm { background: linear-gradient(90deg, #F8676A, #F4292C); }
.bar-row b { text-align: right; font-weight: 700; color: var(--ink-900); font-size: 12.5px; }

/* ---------- 11. 使用流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: step; }
.step {
  position: relative;
  padding: 30px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 14px;
  font-size: 26px;
  font-weight: 800;
  color: var(--brand-500);
  opacity: .5;
}
.step h3 { font-size: 17px; }
.step p { margin-top: 8px; font-size: 14.5px; color: var(--ink-500); }

/* ---------- 12. 下载横幅 ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  padding: 56px;
  color: #fff;
  background: var(--grad-brand);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}
.cta-band::after {
  content: "";
  position: absolute;
  right: -120px; top: -120px;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(255, 255, 255, .2), transparent 68%);
}
.cta-band > * { position: relative; z-index: 1; }
.cta-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 40px; align-items: center; }
.cta-band h2 { color: #fff; }
.cta-band p { margin-top: 14px; color: rgba(255, 255, 255, .86); max-width: 42em; }
.cta-band .btn-row { margin-top: 30px; }
.qr-box {
  padding: 16px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 16px 36px rgba(3, 20, 46, .24);
  text-align: center;
}
.qr-box img { width: 168px; height: 168px; margin: 0 auto; }
.qr-box p { margin-top: 10px; font-size: 13px; color: var(--ink-500); }

/* ---------- 13. 下载页 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.dl-card {
  display: flex;
  flex-direction: column;
  padding: 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}
.dl-card--app { border-top: 4px solid var(--brand-800); }
.dl-card--web { border-top: 4px solid var(--accent); }
.dl-top { display: flex; align-items: center; gap: 16px; }
.dl-top img, .dl-top .glyph {
  width: 62px; height: 62px;
  flex: none;
  border-radius: 17px;
  box-shadow: var(--shadow-sm);
}
.dl-top .glyph {
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--grad-brand);
}
.dl-top .glyph svg { width: 30px; height: 30px; }
.dl-top h3 { font-size: 20px; }
.dl-top span { font-size: 13.5px; color: var(--ink-400); }
.dl-card > p { margin-top: 18px; font-size: 15px; }
.dl-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--ink-500);
}
.dl-meta b { color: var(--ink-900); font-weight: 700; }
.dl-card .btn { margin-top: auto; }
.dl-card .btn-row { margin-top: 22px; }
.dl-qr {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px dashed var(--line-strong);
}
.dl-qr img { width: 116px; height: 116px; flex: none; border-radius: 8px; }
.dl-qr p { font-size: 13.5px; color: var(--ink-500); }
.dl-qr strong { display: block; margin-bottom: 5px; color: var(--ink-900); font-size: 14.5px; }

.spec-table { width: 100%; margin-top: 22px; border-collapse: collapse; font-size: 14.5px; }
.spec-table th, .spec-table td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); }
.spec-table th { width: 178px; font-weight: 600; color: var(--ink-500); background: #FAFCFF; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table td { color: var(--ink-900); font-weight: 600; }
.spec-table .mono { font-family: ui-monospace, "Cascadia Mono", Consolas, "Courier New", monospace; font-size: 13.5px; }

/* ---------- 14. 问答 ---------- */
.faq { display: grid; gap: 12px; max-width: 880px; margin: 0 auto; }
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}
.faq summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 22px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink-900);
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  width: 10px; height: 10px;
  margin-left: auto;
  flex: none;
  border-right: 2px solid var(--ink-400);
  border-bottom: 2px solid var(--ink-400);
  transform: rotate(45deg) translateY(-2px);
  transition: transform .2s ease;
}
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.faq details[open] summary { color: var(--brand-800); }
.faq .faq-body {
  padding: 0 22px 20px;
  font-size: 14.8px;
  color: var(--ink-500);
}
.faq .faq-body p + p { margin-top: 10px; }

/* ---------- 15. 关于页 ---------- */
.prose { max-width: 880px; }
.prose h2 { margin-top: 44px; font-size: 23px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 26px; font-size: 17.5px; }
.prose p, .prose li { margin-top: 12px; font-size: 15.5px; color: var(--ink-700); }
.prose ul { padding-left: 2px; }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 11px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--brand-500);
}
.prose .note {
  margin-top: 20px;
  padding: 18px 22px;
  font-size: 14.5px;
  color: var(--ink-700);
  background: var(--brand-50);
  border-left: 3px solid var(--brand-600);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.contact-card {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding: 26px 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.contact-card .label { font-size: 13px; color: var(--ink-400); }
.contact-card .value {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 19px;
  font-weight: 700;
  color: var(--brand-800);
}

/* 页脚 */
.site-footer {
  padding: 60px 0 30px;
  color: rgba(255, 255, 255, .74);
  background: #0B1A2E;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: 40px;
}
.site-footer .brand-name { color: #fff; }
.site-footer .brand-name small { color: rgba(255, 255, 255, .5); }
.site-footer .about { margin-top: 18px; max-width: 30em; font-size: 14px; line-height: 1.75; }
.footer-col h4 {
  margin-bottom: 16px;
  color: #fff;
  font-size: 14.5px;
  letter-spacing: .03em;
}
.footer-col li { margin-bottom: 10px; font-size: 14px; }
.footer-col a { color: rgba(255, 255, 255, .74); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  margin-top: 46px;
  padding-top: 22px;
  font-size: 13px;
  color: rgba(255, 255, 255, .5);
  border-top: 1px solid rgba(255, 255, 255, .12);
}

/* ---------- 16. 页内导航（二级页） ---------- */
.page-hero {
  padding: 62px 0 54px;
  background:
    radial-gradient(720px 340px at 82% -20%, rgba(31, 122, 224, .15), transparent 62%),
    var(--grad-soft);
  border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(27px, 3.4vw, 40px); }
.page-hero p { margin-top: 16px; max-width: 46em; font-size: 17px; color: var(--ink-500); }
.crumb { margin-bottom: 16px; font-size: 13.5px; color: var(--ink-400); }
.crumb a { color: var(--ink-500); }
.crumb a:hover { color: var(--brand-700); }
.crumb span { margin: 0 7px; }

/* ---------- 17. 动效与工具类 ---------- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity .6s ease, transform .6s cubic-bezier(.22, .68, .31, 1);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
  .btn:hover, .card:hover { transform: none; }
}
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-lg { margin-top: 44px; }
.mb-lg { margin-bottom: 44px; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: 16px; top: -60px;
  z-index: 100;
  padding: 10px 18px;
  color: #fff;
  background: var(--brand-800);
  border-radius: 0 0 10px 10px;
  transition: top .2s ease;
}
.skip-link:focus { top: 0; color: #fff; }

/* 提示条 */
.toast {
  position: fixed;
  left: 50%; bottom: 34px;
  z-index: 200;
  padding: 12px 22px;
  font-size: 14.5px;
  font-weight: 600;
  color: #fff;
  background: rgba(14, 27, 46, .94);
  border-radius: 999px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translate(-50%, 14px);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 54px; }
  .device { margin-top: 8px; }
  .device-float--a { left: -14px; }
  .device-float--b { right: -14px; }
  .stat-panel { grid-template-columns: 1fr; gap: 34px; padding: 34px; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 34px; }
}

@media (max-width: 900px) {
  .section { padding: 66px 0; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .cta-grid { grid-template-columns: 1fr; justify-items: start; }
  .dl-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 40px 30px; }
}

@media (max-width: 780px) {
  .nav {
    position: fixed;
    left: 0; right: 0; top: var(--header-h);
    margin: 0;
    padding: 14px 20px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav.is-open { display: block; }
  .nav ul { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav a { padding: 12px 14px; border-radius: 12px; font-size: 16px; }
  .nav-toggle { display: grid; place-items: center; margin-left: auto; }
  .header-actions .btn { display: none; }
  .hero { padding: 52px 0 66px; }
  .hero-metrics { grid-template-columns: 1fr; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: 1fr; }
  .donut-wrap { grid-template-columns: 1fr; justify-items: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .browser-body { grid-template-columns: 1fr; }
  .browser-side { display: flex; gap: 4px; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .browser-side div { white-space: nowrap; }
}

@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .card, .panel { padding: 24px 20px; }
  .device { width: 262px; }
  .device-float { display: none; }
  .btn { width: 100%; }
  .btn-row { gap: 10px; }
  .hero-note { gap: 8px 16px; }
  .spec-table th { width: 118px; padding: 12px 12px; }
  .spec-table td { padding: 12px 12px; font-size: 13.5px; }
}