/* ===== Design Tokens ===== */
:root {
  --pri: #4d9fe0;
  --pri-d: #3f8fd6;
  --pri-l: #8ec7f0;
  --pri-9: #e8f2fb;
  --accent: #f5a524;
  --ink: #1f2b3a;
  --sub: #7b8a9d;
  --line: #e3e9f2;
  --bg: #f7fafd;
  --surface: #ffffff;
  --wx: #07c160;

  --font-display: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Consolas', 'Roboto Mono', monospace;

  --r-sm: 10px; --r-md: 16px; --r-lg: 24px;
  --sh-sm: 0 1px 2px rgba(31,43,58,.05), 0 2px 8px rgba(31,43,58,.04);
  --sh-md: 0 2px 6px rgba(31,43,58,.05), 0 12px 32px rgba(63,143,214,.10);
  --sh-lg: 0 8px 16px rgba(31,43,58,.06), 0 24px 64px rgba(63,143,214,.16);
  --max: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(900px 600px at 12% -8%, rgba(109,177,232,.22), transparent 60%),
    radial-gradient(800px 560px at 92% 6%, rgba(245,165,36,.1), transparent 60%),
    radial-gradient(1000px 700px at 50% 108%, rgba(109,177,232,.16), transparent 62%),
    var(--bg);
  background-attachment: fixed;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
svg { display: block; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 14px; font-weight: 600; border-radius: 999px;
  padding: 10px 22px; border: 1px solid transparent; position: relative;
  transition: transform .18s ease, box-shadow .18s ease, background-position .55s ease, border-color .18s ease;
}
.btn svg { width: 16px; height: 16px; }

/* 液态玻璃：顶部镜面高光 + 折射描边 + 悬停流光 */
.btn-primary {
  color: #fff; border-color: rgba(255,255,255,.5);
  background:
    linear-gradient(105deg, transparent 32%, rgba(255,255,255,.45) 50%, transparent 68%) no-repeat -230% 0 / 260% 100%,
    linear-gradient(180deg, rgba(255,255,255,.42), rgba(255,255,255,.08) 55%, rgba(255,255,255,0)),
    linear-gradient(180deg, rgba(118,182,238,.78), rgba(69,146,216,.78));
  backdrop-filter: blur(14px) saturate(1.8);
  -webkit-backdrop-filter: blur(14px) saturate(1.8);
  box-shadow: inset 0 1px 1px rgba(255,255,255,.55), inset 0 -6px 12px rgba(43,111,176,.18), 0 8px 24px rgba(77,159,224,.25);
}
.btn-primary:hover {
  background-position: 230% 0, 0 0, 0 0;
  transform: translateY(-2px);
  box-shadow: inset 0 1px 1px rgba(255,255,255,.65), inset 0 -6px 12px rgba(43,111,176,.18), 0 14px 34px rgba(77,159,224,.32);
}
.btn-primary:active { transform: translateY(0) scale(.96); }
.btn-ghost {
  color: var(--pri-d); border-color: rgba(255,255,255,.7);
  background:
    linear-gradient(105deg, transparent 32%, rgba(255,255,255,.6) 50%, transparent 68%) no-repeat -230% 0 / 260% 100%,
    linear-gradient(180deg, rgba(255,255,255,.55), rgba(255,255,255,.22));
  backdrop-filter: blur(14px) saturate(1.6);
  -webkit-backdrop-filter: blur(14px) saturate(1.6);
  box-shadow: inset 0 1px 1px rgba(255,255,255,.65), 0 8px 20px rgba(77,159,224,.12);
}
.btn-ghost:hover {
  background-position: 230% 0, 0 0;
  transform: translateY(-2px); color: var(--pri);
  box-shadow: inset 0 1px 1px rgba(255,255,255,.8), 0 12px 28px rgba(77,159,224,.18);
}
.btn-ghost:active { transform: translateY(0) scale(.96); }
.btn-lg { padding: 14px 30px; font-size: 15px; }
.btn-block { width: 100%; margin-top: auto; }
.btn-nav { padding: 8px 18px; }

/* ===== 导航 ===== */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background .25s ease, box-shadow .25s ease, backdrop-filter .25s ease;
}
.nav.scrolled {
  background: rgba(255,255,255,.52);
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  box-shadow: inset 0 -1px 0 rgba(255,255,255,.6), 0 10px 30px rgba(77,159,224,.07);
}
.nav-in {
  max-width: var(--max); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 32px;
}
.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.brand-mark { width: 34px; height: 34px; color: #4f46e5; }
.brand-mark svg { width: 100%; height: 100%; display: block; }
.brand-mark.small { width: 30px; height: 30px; }

/* 真实产品 Logo：与 Web / App / 鸿蒙端同源的几何与动效 */
.logo .lg-big { transform-origin: 32px 32px; animation: sl-spin 24s linear infinite; }
.logo .lg-small { transform-origin: 32px 32px; animation: sl-spin-rev 12s linear infinite; }
.logo .lg-body { fill: none; stroke: currentColor; stroke-width: 1.4; }
.logo .lg-pitch { fill: none; stroke: currentColor; stroke-width: .6; stroke-dasharray: 2 2; opacity: .5; }
.logo .lg-tooth { fill: currentColor; opacity: .9; }
.logo .lg-hole { fill: currentColor; opacity: .18; stroke: currentColor; stroke-width: 1; }
.logo .lg-cross line { stroke: currentColor; stroke-width: .6; opacity: .25; }
@keyframes sl-spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes sl-spin-rev { from { transform: rotate(0deg); } to { transform: rotate(-360deg); } }
.brand-txt { font-weight: 800; font-size: 17px; letter-spacing: 1px; line-height: 1.15; }
.brand-txt small { display: block; font-size: 9px; font-weight: 600; letter-spacing: 2px; color: var(--sub); }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 14px; color: var(--sub); font-weight: 500; position: relative; padding: 4px 0; transition: color .18s; }
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--pri-d); font-weight: 600; }
.nav-links a.active::after {
  content: ''; position: absolute; left: 50%; bottom: -4px; transform: translateX(-50%);
  width: 16px; height: 3px; border-radius: 2px; background: var(--pri);
}
.nav-cta { display: flex; gap: 10px; align-items: center; }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  padding: 148px 24px 0;
  background:
    linear-gradient(rgba(63,143,214,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(63,143,214,.045) 1px, transparent 1px),
    radial-gradient(900px 480px at 78% -10%, #dceefb 0%, rgba(220,238,251,0) 60%),
    radial-gradient(700px 420px at 8% 8%, #eef6fd 0%, rgba(238,246,253,0) 55%),
    var(--bg);
  background-size: 44px 44px, 44px 44px, auto, auto, auto;
}
.gear { position: absolute; color: rgba(63,143,214,.14); pointer-events: none; }
.gear.g1 { width: 300px; height: 300px; right: -70px; top: 90px; animation: spin 40s linear infinite; }
.gear.g2 { width: 160px; height: 160px; right: 210px; top: 320px; color: rgba(245,165,36,.16); animation: spin 26s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }

.hero-in {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center;
}
.eyebrow {
  display: inline-block; font-family: var(--font-mono); font-size: 12px; letter-spacing: 2px;
  color: var(--pri-d); background: var(--pri-9); border: 1px solid #cfe5f8;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.6vw, 52px); font-weight: 800; line-height: 1.22; letter-spacing: 1px;
}
.hero .sub { margin-top: 18px; font-size: 16px; color: var(--sub); line-height: 1.9; }
.hero-actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }

/* 设备组合视觉 */
.hero-visual { position: relative; height: 420px; }
.device-browser {
  position: absolute; right: 0; top: 18px; width: 92%;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  box-shadow: var(--sh-lg); overflow: hidden;
}
.db-bar {
  display: flex; align-items: center; gap: 6px; padding: 10px 14px;
  background: #fbfdff; border-bottom: 1px solid var(--line);
}
.db-bar i { width: 9px; height: 9px; border-radius: 50%; background: #dfe8f2; }
.db-bar i:first-child { background: #ff5f57; } .db-bar i:nth-child(2) { background: #febc2e; } .db-bar i:nth-child(3) { background: #28c840; }
.db-url {
  margin-left: 10px; flex: 1; font-family: var(--font-mono); font-size: 11px; color: var(--sub);
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 3px 10px;
}
.db-body { display: flex; height: 280px; }
.db-side {
  width: 64px; background: #f4f9fe; border-right: 1px solid var(--line);
  padding: 14px 12px; display: flex; flex-direction: column; gap: 10px;
}
.db-side span { height: 22px; border-radius: 6px; background: #e2edf8; }
.db-side span.on { background: var(--pri); box-shadow: 0 3px 8px rgba(63,143,214,.35); }
.db-main { flex: 1; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.db-cards { display: flex; gap: 10px; }
.db-cards b { flex: 1; height: 46px; border-radius: 9px; background: linear-gradient(150deg, var(--pri-9), #f4f9fe); border: 1px solid #dcebf9; }
.db-chart {
  flex: 1; display: flex; align-items: flex-end; gap: 8px; padding: 12px;
  background: #fbfdff; border: 1px solid var(--line); border-radius: 9px;
}
.db-chart i { flex: 1; border-radius: 4px 4px 2px 2px; background: linear-gradient(180deg, var(--pri-l), var(--pri)); opacity: .85; }
.db-row { height: 16px; border-radius: 5px; background: #edf3fa; }
.db-row.short { width: 62%; }
.device-phone {
  position: absolute; left: 0; bottom: 0; width: 132px; height: 262px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 22px;
  box-shadow: var(--sh-lg); padding: 12px 10px;
}
.dp-notch { width: 44px; height: 5px; border-radius: 3px; background: var(--line); margin: 0 auto 10px; }
.dp-head { height: 54px; border-radius: 10px; background: linear-gradient(140deg, var(--pri-l), var(--pri)); margin-bottom: 10px; }
.dp-list { display: flex; flex-direction: column; gap: 8px; }
.dp-list i { height: 34px; border-radius: 8px; background: var(--pri-9); border: 1px solid #dcebf9; }
.dp-tab { position: absolute; left: 10px; right: 10px; bottom: 10px; height: 26px; border-radius: 8px; background: #f0f5fb; border: 1px solid var(--line); }

/* 平台条 */
.platforms {
  max-width: var(--max); margin: 56px auto 0; padding: 22px 0 34px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: center; gap: clamp(20px, 5vw, 56px); flex-wrap: wrap;
}
.platforms a { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--sub); transition: color .18s, transform .18s; }
.platforms a:hover { color: var(--pri-d); transform: translateY(-2px); }
.platforms svg { width: 19px; height: 19px; }

/* ===== 通用 Section ===== */
.section { max-width: var(--max); margin: 0 auto; padding: 88px 24px 0; }
.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head h2 { font-family: var(--font-display); font-size: clamp(26px, 3vw, 34px); font-weight: 800; letter-spacing: 1px; }
.sec-head p { margin-top: 10px; color: var(--sub); font-size: 15px; }

/* ===== 下载区 ===== */
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.dl-card {
  display: flex; flex-direction: column; align-items: flex-start;
  background: linear-gradient(180deg, rgba(255,255,255,.5), rgba(255,255,255,.32));
  backdrop-filter: blur(18px) saturate(1.6);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  border: 1px solid rgba(255,255,255,.65); border-radius: var(--r-md);
  padding: 26px 22px; box-shadow: inset 0 1px 1px rgba(255,255,255,.6), 0 6px 20px rgba(77,159,224,.07);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.dl-card:hover {
  transform: translateY(-6px); border-color: rgba(255,255,255,.85);
  box-shadow: inset 0 1px 1px rgba(255,255,255,.7), 0 22px 48px rgba(77,159,224,.16);
}
.dl-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  margin-bottom: 16px; color: #fff;
}
.dl-icon svg { width: 26px; height: 26px; }
.dl-icon.win { background: linear-gradient(140deg, #4db3f5, #0078d4); }
.dl-icon.android { background: linear-gradient(140deg, #3ddc84, #1fa566); }
.dl-icon.harmony { background: linear-gradient(140deg, #4a7bf0, #7c4dff); }
.dl-icon.wechat { background: linear-gradient(140deg, #4ade80, #07c160); }
.dl-card h3 { font-size: 17px; font-weight: 700; }
.dl-desc { margin-top: 8px; font-size: 13px; color: var(--sub); line-height: 1.7; min-height: 66px; }
.dl-meta { font-family: var(--font-mono); font-size: 11px; color: var(--pri-d); background: var(--pri-9); border-radius: 6px; padding: 4px 10px; margin: 12px 0 16px; }

/* ===== 功能特性 ===== */
.ft-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ft-card {
  background: linear-gradient(180deg, rgba(255,255,255,.48), rgba(255,255,255,.3));
  backdrop-filter: blur(18px) saturate(1.6);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  border: 1px solid rgba(255,255,255,.65); border-radius: var(--r-md);
  padding: 26px 24px; box-shadow: inset 0 1px 1px rgba(255,255,255,.6), 0 6px 20px rgba(77,159,224,.07);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.ft-card:hover {
  transform: translateY(-4px); border-color: rgba(255,255,255,.85);
  box-shadow: inset 0 1px 1px rgba(255,255,255,.7), 0 20px 44px rgba(77,159,224,.15);
}
.ft-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--pri-9); color: var(--pri-d); margin-bottom: 16px;
}
.ft-icon svg { width: 23px; height: 23px; }
.ft-card h3 { font-size: 16px; font-weight: 700; }
.ft-card p { margin-top: 8px; font-size: 13px; color: var(--sub); line-height: 1.7; }
.ft-tags { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.ft-tags span { font-size: 11px; color: var(--pri-d); background: var(--pri-9); border-radius: 999px; padding: 3px 10px; }
.ft-ai { background: linear-gradient(150deg, rgba(226,242,255,.55), rgba(255,255,255,.32)); }
.ft-ai .ft-icon { background: linear-gradient(140deg, var(--pri-l), var(--pri)); color: #fff; }

/* ===== 数据带 ===== */
.stats {
  max-width: var(--max); margin: 88px auto 0; padding: 44px 24px;
  border-top: 1px solid var(--line);
  display: grid; grid-template-columns: repeat(4, 1fr); text-align: center;
}
.stat b {
  display: block; font-family: var(--font-display); font-size: 40px; font-weight: 800;
  color: var(--pri); line-height: 1.1;
}
.stat span { font-size: 13px; color: var(--sub); }

/* ===== 页脚 ===== */
.footer { margin-top: 88px; border-top: 1px solid var(--line); background: var(--surface); }
.ft-in {
  max-width: var(--max); margin: 0 auto; padding: 40px 24px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.ft-brand { display: flex; align-items: center; gap: 12px; }
.ft-brand b { font-size: 16px; letter-spacing: 1px; }
.ft-brand p { font-size: 12px; color: var(--sub); margin-top: 2px; }
.ft-links { display: flex; gap: 24px; }
.ft-links a { font-size: 13px; color: var(--sub); transition: color .18s; }
.ft-links a:hover { color: var(--pri-d); }
.ft-copy {
  max-width: var(--max); margin: 0 auto; padding: 18px 24px 26px;
  font-size: 12px; color: var(--sub); border-top: 1px solid #f0f4f9;
}

/* ===== 弹层 ===== */
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; }
.modal[hidden] { display: none; }
.modal-mask { position: absolute; inset: 0; background: rgba(31,43,58,.35); backdrop-filter: blur(14px) saturate(1.4); -webkit-backdrop-filter: blur(14px) saturate(1.4); animation: fade .2s ease; }
.modal-card {
  position: relative; background: linear-gradient(180deg, rgba(255,255,255,.78), rgba(255,255,255,.6));
  backdrop-filter: blur(28px) saturate(1.6);
  -webkit-backdrop-filter: blur(28px) saturate(1.6);
  border: 1px solid rgba(255,255,255,.7); border-radius: var(--r-lg);
  padding: 36px 32px 28px; text-align: center; box-shadow: inset 0 1px 1px rgba(255,255,255,.7), 0 24px 64px rgba(31,43,58,.15);
  animation: pop .24s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: scale(.92) translateY(8px); } }
.modal-x {
  position: absolute; top: 12px; right: 12px; width: 32px; height: 32px;
  border-radius: 50%; display: grid; place-items: center; color: var(--sub);
  transition: background .18s, color .18s;
}
.modal-x:hover { background: var(--bg); color: var(--ink); }
.modal-x svg { width: 16px; height: 16px; }
.qr-fake { position: relative; width: 196px; height: 196px; margin: 0 auto 18px; border: 1px solid var(--line); border-radius: var(--r-sm); padding: 14px; }
.qr-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 3px; height: 100%; }
.qr-grid b { background: #dce6f0; border-radius: 2px; }
.qr-grid b:nth-child(3n) { background: var(--ink); }
.qr-grid b:nth-child(7n) { background: var(--pri); }
.qr-grid b:nth-child(11n) { background: var(--pri-d); }
.qr-fake > i { position: absolute; width: 34px; height: 34px; border: 3px solid var(--pri-d); border-radius: 8px; background: #fff; }
.qr-fake > i:nth-child(1) { top: 10px; left: 10px; }
.qr-fake > i:nth-child(2) { top: 10px; right: 10px; }
.qr-fake > i:nth-child(3) { bottom: 10px; left: 10px; }
.modal-card h3 { font-size: 17px; font-weight: 700; }
.modal-card p { margin-top: 6px; font-size: 12px; color: var(--sub); }

/* ===== 进场动效 ===== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s cubic-bezier(.2,.7,.3,1); }
.reveal.in { opacity: 1; transform: none; }
.hero-copy .reveal:nth-child(1) { transition-delay: .02s; }
.hero-copy .reveal:nth-child(2) { transition-delay: .08s; }
.hero-copy .reveal:nth-child(3) { transition-delay: .14s; }
.hero-copy .reveal:nth-child(4) { transition-delay: .2s; }
.hero-copy .reveal:nth-child(5) { transition-delay: .26s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .gear, .logo .lg-big, .logo .lg-small { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-in { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { height: 380px; max-width: 560px; margin: 0 auto; width: 100%; }
  .dl-grid { grid-template-columns: repeat(2, 1fr); }
  .ft-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-repo { display: none; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
  .section { padding-top: 64px; }
}
@media (max-width: 480px) {
  .hero { padding-top: 118px; }
  .hero-actions .btn { width: 100%; }
  .dl-grid { grid-template-columns: 1fr; }
  .ft-grid { grid-template-columns: 1fr; }
  .hero-visual { height: 330px; }
  .device-phone { width: 112px; height: 224px; }
  .ft-in { flex-direction: column; align-items: flex-start; }
}