:root {
  --ink: #121826;
  --body: #4b5565;
  --muted: #758094;
  --line: #e7eaf0;
  --paper: #ffffff;
  --soft: #f7f8fb;
  --brand: #2563eb;
  --brand-dark: #1746b5;
  --brand-soft: #edf4ff;
  --brand-rgb: 37, 99, 235;
  --success: #16835b;
}

.brand-uoutao {
  --brand: #f0445b;
  --brand-dark: #c52842;
  --brand-soft: #fff1f3;
  --brand-rgb: 240, 68, 91;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  color: var(--body);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
button, input { font: inherit; }

.skip-link {
  position: fixed; left: 16px; top: -56px; z-index: 200;
  padding: 10px 16px; border-radius: 10px; background: var(--ink); color: #fff;
  transition: top .2s;
}
.skip-link:focus { top: 12px; }

.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 96px 0; }
.section-soft { background: var(--soft); }
.section-heading { max-width: 680px; margin-bottom: 44px; }
.section-heading.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 14px; color: var(--brand); font-size: 13px; font-weight: 800;
  letter-spacing: .12em; text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; border-radius: 2px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--ink); }
h1 { margin-bottom: 20px; font-size: clamp(44px, 6.1vw, 78px); line-height: 1.03; letter-spacing: -.055em; }
h2 { margin-bottom: 15px; font-size: clamp(30px, 4vw, 48px); line-height: 1.12; letter-spacing: -.035em; }
h3 { margin-bottom: 10px; font-size: 19px; line-height: 1.35; }
.section-copy { font-size: 17px; line-height: 1.8; }

.site-header {
  position: fixed; inset: 0 0 auto; z-index: 100; height: 72px;
  border-bottom: 1px solid rgba(231, 234, 240, .9);
  background: rgba(255, 255, 255, .9); backdrop-filter: blur(18px);
}
.header-inner { height: 100%; display: flex; align-items: center; gap: 30px; }
.brand-link { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; flex: 0 0 auto; }
.brand-link img { width: 38px; height: 38px; border-radius: 11px; object-fit: cover; box-shadow: 0 5px 16px rgba(var(--brand-rgb), .2); }
.brand-name { color: var(--ink); font-weight: 850; font-size: 19px; line-height: 1; }
.brand-sub { display: block; margin-top: 5px; color: var(--muted); font-weight: 600; font-size: 10px; letter-spacing: .12em; text-transform: uppercase; }
.main-nav { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.main-nav a { color: #505a6d; font-size: 14px; font-weight: 650; text-decoration: none; }
.main-nav a:hover { color: var(--brand); }
.header-action { margin-left: 4px; }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  min-height: 48px; padding: 0 22px; border: 1px solid transparent; border-radius: 13px;
  background: var(--brand); color: #fff; font-weight: 760; text-decoration: none;
  box-shadow: 0 12px 26px -13px rgba(var(--brand-rgb), .8);
  transition: transform .2s, background .2s, box-shadow .2s;
}
.button:hover { transform: translateY(-2px); background: var(--brand-dark); box-shadow: 0 16px 30px -13px rgba(var(--brand-rgb), .9); }
.button.secondary { color: var(--ink); border-color: var(--line); background: rgba(255,255,255,.92); box-shadow: none; }
.button.secondary:hover { border-color: rgba(var(--brand-rgb), .45); color: var(--brand); }
.button.compact { min-height: 40px; padding: 0 17px; border-radius: 11px; font-size: 14px; }

.hero {
  position: relative; min-height: 760px; padding: 152px 0 96px; overflow: hidden;
  background:
    radial-gradient(circle at 75% 26%, rgba(var(--brand-rgb), .16), transparent 29%),
    linear-gradient(180deg, var(--brand-soft) 0%, #fff 78%);
}
.hero::before {
  content: ""; position: absolute; inset: 72px 0 0; opacity: .44; pointer-events: none;
  background-image: linear-gradient(rgba(18,24,38,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(18,24,38,.035) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: linear-gradient(to bottom, #000, transparent 82%);
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.02fr .98fr; gap: 72px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px; margin-bottom: 24px; padding: 8px 13px;
  border: 1px solid rgba(var(--brand-rgb), .22); border-radius: 999px; background: rgba(255,255,255,.75);
  color: var(--brand-dark); font-size: 13px; font-weight: 750;
}
.hero-badge span { width: 8px; height: 8px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 5px rgba(var(--brand-rgb), .12); }
.hero-title-mark { color: var(--brand); }
.hero-lead { max-width: 620px; margin-bottom: 30px; color: #3f4b5e; font-size: 19px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
.hero-note { display: flex; flex-wrap: wrap; gap: 18px; color: var(--muted); font-size: 13px; }
.hero-note span { display: inline-flex; align-items: center; gap: 7px; }
.hero-note i { color: var(--success); }

.product-stage { position: relative; min-height: 520px; }
.product-glow { position: absolute; inset: 8% 8% 4%; border-radius: 50%; background: rgba(var(--brand-rgb), .2); filter: blur(65px); }
.product-card {
  position: absolute; left: 7%; right: 4%; top: 8%; bottom: 7%;
  border: 1px solid rgba(255,255,255,.8); border-radius: 32px;
  background: rgba(255,255,255,.76); backdrop-filter: blur(20px);
  box-shadow: 0 34px 80px -34px rgba(30,41,59,.38); overflow: hidden;
}
.product-card-top { height: 56px; display: flex; align-items: center; gap: 8px; padding: 0 20px; border-bottom: 1px solid var(--line); }
.window-dot { width: 9px; height: 9px; border-radius: 50%; background: #d8dde7; }
.product-card-body { display: grid; grid-template-columns: 132px 1fr; height: calc(100% - 56px); }
.visual-sidebar { padding: 24px 16px; background: rgba(var(--brand-rgb), .045); border-right: 1px solid var(--line); }
.visual-logo { width: 62px; height: 62px; margin-bottom: 28px; border-radius: 18px; object-fit: cover; box-shadow: 0 12px 25px rgba(var(--brand-rgb), .18); }
.visual-nav { height: 10px; margin: 0 0 16px; border-radius: 5px; background: #dde2eb; }
.visual-nav.active { width: 86%; background: rgba(var(--brand-rgb), .45); }
.visual-content { padding: 26px; overflow: hidden; }
.visual-kicker { color: var(--brand); font-size: 12px; font-weight: 800; }
.visual-headline { margin: 6px 0 20px; color: var(--ink); font-size: 23px; font-weight: 850; }
.platform-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.platform-chip { min-height: 72px; padding: 13px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.platform-chip strong { display: block; margin-bottom: 5px; color: var(--ink); font-size: 13px; }
.platform-chip small { color: var(--muted); font-size: 11px; }
.float-card {
  position: absolute; z-index: 2; display: flex; align-items: center; gap: 12px;
  padding: 13px 16px; border: 1px solid rgba(255,255,255,.9); border-radius: 16px;
  background: rgba(255,255,255,.94); box-shadow: 0 18px 36px -18px rgba(30,41,59,.38);
}
.float-card i { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 11px; background: var(--brand-soft); color: var(--brand); }
.float-card strong { display: block; color: var(--ink); font-size: 13px; }
.float-card small { color: var(--muted); font-size: 11px; }
.float-card.one { left: 0; bottom: 18%; }
.float-card.two { right: 0; top: 18%; }

.proof-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.proof-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.proof-item { padding: 27px 24px; border-right: 1px solid var(--line); }
.proof-item:last-child { border-right: 0; }
.proof-item strong { display: block; margin-bottom: 4px; color: var(--ink); font-size: 21px; }
.proof-item span { color: var(--muted); font-size: 13px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { padding: 28px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: 0 10px 28px -26px #1f2937; }
.feature-card:hover { border-color: rgba(var(--brand-rgb), .35); }
.icon-box { display: grid; place-items: center; width: 48px; height: 48px; margin-bottom: 21px; border-radius: 14px; background: var(--brand-soft); color: var(--brand); font-size: 18px; }
.feature-card p { margin-bottom: 0; font-size: 14px; line-height: 1.75; }

.source-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 72px; align-items: center; }
.source-list { display: grid; gap: 13px; }
.platform-logo-wall {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px;
  margin-bottom: 5px;
}
.platform-logo-card {
  min-width: 0; padding: 15px 8px 13px; border: 1px solid var(--line); border-radius: 16px;
  background: #fff; text-align: center;
}
.platform-logo-card img {
  width: 48px; height: 48px; margin: 0 auto 10px; border-radius: 12px;
  object-fit: contain; background: #fff; box-shadow: 0 0 0 1px var(--line);
}
.platform-logo-card strong { display: block; color: var(--ink); font-size: 12px; line-height: 1.35; }
.platform-logo-card span { display: block; margin-top: 4px; color: var(--brand); font-size: 10px; font-weight: 750; }
.source-row { display: grid; grid-template-columns: 52px 1fr auto; gap: 15px; align-items: center; padding: 18px; border: 1px solid var(--line); border-radius: 17px; background: #fff; }
.source-row i { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 13px; background: var(--brand-soft); color: var(--brand); font-size: 17px; }
.source-row strong { display: block; color: var(--ink); font-size: 15px; }
.source-row small { display: block; margin-top: 4px; color: var(--muted); line-height: 1.5; }
.source-tag { padding: 6px 10px; border-radius: 999px; background: var(--soft); color: #667085; font-size: 11px; font-weight: 750; white-space: nowrap; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step { position: relative; padding: 27px 23px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.step-number { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; margin-bottom: 42px; border-radius: 10px; background: var(--brand); color: #fff; font-weight: 850; }
.step::after { content: ""; position: absolute; top: 43px; left: 72px; right: -17px; height: 1px; background: rgba(var(--brand-rgb), .3); }
.step:last-child::after { display: none; }
.step p { margin-bottom: 0; font-size: 14px; line-height: 1.7; }

.screens-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 60px; align-items: center; }
.screen-copy-list { display: grid; gap: 18px; margin-top: 30px; }
.screen-copy-item { display: flex; gap: 13px; }
.screen-copy-item i { flex: 0 0 auto; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); }
.screen-copy-item strong { display: block; margin-bottom: 3px; color: var(--ink); font-size: 14px; }
.screen-copy-item span { color: var(--muted); font-size: 13px; line-height: 1.6; }
.phone-gallery { display: flex; align-items: center; justify-content: center; gap: 16px; min-height: 520px; }
.phone { width: min(31%, 190px); padding: 7px; border-radius: 27px; background: #171a20; box-shadow: 0 25px 45px -25px #1f2937; transform: rotate(-3deg) translateY(22px); }
.phone:nth-child(2) { transform: translateY(-18px); }
.phone:nth-child(3) { transform: rotate(3deg) translateY(22px); }
.phone img { width: 100%; border-radius: 21px; }

.mode-card { padding: 24px; border: 1px solid rgba(var(--brand-rgb), .24); border-radius: 20px; background: var(--brand-soft); }
.mode-card strong { color: var(--ink); }
.mode-card p { margin: 8px 0 0; font-size: 14px; line-height: 1.7; }

.download-shell { position: relative; overflow: hidden; padding: 70px; border-radius: 34px; color: rgba(255,255,255,.82); background: var(--ink); }
.download-shell::after { content: ""; position: absolute; width: 430px; height: 430px; right: -120px; top: -200px; border-radius: 50%; background: rgba(var(--brand-rgb), .62); filter: blur(25px); }
.download-shell h2, .download-shell h3 { color: #fff; }
.download-head { position: relative; z-index: 1; max-width: 650px; margin-bottom: 38px; }
.download-head p { margin-bottom: 0; line-height: 1.75; }
.download-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.download-card { display: block; min-height: 210px; padding: 24px; border: 1px solid rgba(255,255,255,.15); border-radius: 20px; background: rgba(255,255,255,.075); color: rgba(255,255,255,.75); text-decoration: none; transition: transform .2s, background .2s; }
.download-card:hover { transform: translateY(-4px); background: rgba(255,255,255,.13); }
.download-card i { margin-bottom: 38px; color: #fff; font-size: 30px; }
.download-card strong { display: block; margin-bottom: 8px; color: #fff; font-size: 18px; }
.download-card span { display: block; min-height: 42px; font-size: 13px; line-height: 1.6; }
.download-link { margin-top: 18px; color: #fff; font-size: 13px; font-weight: 750; }

.faq-layout { display: grid; grid-template-columns: .68fr 1.32fr; gap: 72px; align-items: start; }
.faq-aside { position: sticky; top: 102px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 23px 42px 23px 0; color: var(--ink); font-size: 16px; font-weight: 720; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 20px; color: var(--brand); font-size: 23px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { padding: 0 46px 22px 0; margin: 0; font-size: 14px; line-height: 1.8; }

.support-card { display: grid; grid-template-columns: 1fr auto; gap: 34px; align-items: center; padding: 38px; border: 1px solid var(--line); border-radius: 25px; background: #fff; }
.support-card-single { grid-template-columns: 1fr; }
.support-card-single .support-copy { max-width: 780px; }
.support-copy p { max-width: 650px; margin-bottom: 20px; line-height: 1.75; }
.qr-wrap { width: 158px; padding: 9px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 15px 40px -27px #1f2937; }
.qr-wrap img { width: 140px; height: 140px; object-fit: cover; border-radius: 10px; }
.qr-caption { margin-top: 9px; color: var(--muted); font-size: 11px; text-align: center; }

.site-footer { padding: 44px 0 92px; border-top: 1px solid var(--line); background: #fff; }
.footer-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 30px; }
.footer-brand { display: flex; align-items: center; gap: 12px; color: var(--ink); font-weight: 800; }
.footer-brand img { width: 40px; height: 40px; border-radius: 11px; object-fit: cover; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 19px; }
.footer-links a { color: #5f6a7e; font-size: 13px; text-decoration: none; }
.footer-links a:hover { color: var(--brand); }
.footer-legal { max-width: 900px; margin-top: 27px; color: #8a93a5; font-size: 11px; line-height: 1.75; }

.mobile-download { display: none; }

@media (max-width: 980px) {
  .main-nav { display: none; }
  .header-action { margin-left: auto; }
  .hero { min-height: auto; padding-top: 128px; }
  .hero-grid, .source-layout, .screens-layout, .faq-layout { grid-template-columns: 1fr; gap: 52px; }
  .hero-copy { text-align: center; }
  .hero-lead { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-note { justify-content: center; }
  .product-stage { max-width: 630px; width: 100%; margin: 0 auto; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step:nth-child(2)::after { display: none; }
  .download-shell { padding: 54px 36px; }
  .faq-aside { position: static; }
}

@media (max-width: 680px) {
  .container { width: min(100% - 28px, 1160px); }
  .section { padding: 70px 0; }
  .site-header { height: 64px; }
  .brand-link img { width: 35px; height: 35px; }
  .brand-sub { display: none; }
  .header-action { display: none; }
  .hero { padding: 112px 0 68px; }
  .hero-grid { gap: 42px; }
  h1 { font-size: clamp(39px, 13vw, 58px); }
  .hero-lead { font-size: 16px; }
  .hero-actions .button { width: 100%; }
  .product-stage { min-height: 400px; }
  .product-card { left: 1%; right: 1%; }
  .product-card-body { grid-template-columns: 85px 1fr; }
  .visual-sidebar { padding: 20px 12px; }
  .visual-logo { width: 50px; height: 50px; }
  .visual-content { padding: 20px 14px; }
  .visual-headline { font-size: 18px; }
  .platform-chip { min-height: 64px; padding: 10px; }
  .float-card { padding: 10px 12px; }
  .float-card.one { left: -4px; bottom: 2%; }
  .float-card.two { right: -4px; top: 8%; }
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .proof-item:nth-child(2) { border-right: 0; }
  .proof-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .feature-grid, .steps, .download-grid { grid-template-columns: 1fr; }
  .step::after { display: none; }
  .step-number { margin-bottom: 25px; }
  .source-row { grid-template-columns: 48px 1fr; }
  .source-tag { grid-column: 2; justify-self: start; }
  .platform-logo-wall { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .platform-logo-card:last-child { grid-column: 2; }
  .phone-gallery { min-height: 420px; gap: 8px; }
  .phone { width: 31.5%; padding: 4px; border-radius: 19px; }
  .phone img { border-radius: 15px; }
  .download-shell { padding: 38px 20px; border-radius: 24px; }
  .download-card { min-height: 0; }
  .download-card i { margin-bottom: 24px; }
  .support-card { grid-template-columns: 1fr; padding: 28px 22px; }
  .qr-wrap { justify-self: center; }
  .footer-top { display: block; }
  .footer-links { justify-content: flex-start; margin-top: 24px; }
  .site-footer { padding-bottom: 106px; }
  .mobile-download {
    position: fixed; z-index: 90; left: 12px; right: 12px; bottom: 12px;
    display: flex; gap: 10px; padding: 9px; border: 1px solid rgba(231,234,240,.95);
    border-radius: 17px; background: rgba(255,255,255,.94); box-shadow: 0 14px 38px rgba(15,23,42,.18); backdrop-filter: blur(16px);
  }
  .mobile-download .button { flex: 1; min-height: 45px; padding: 0 13px; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}