:root {
  --ink: #111a33;
  --muted: #667085;
  --line: #dfe5ef;
  --paper: #f7f9fc;
  --card: #ffffff;
  --cyan: #0ea5e9;
  --cyan-soft: #dff6ff;
  --orange: #fb923c;
  --orange-soft: #fff0df;
  --violet: #6d5ce7;
  --shadow: 0 18px 50px rgba(31, 45, 80, .10);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(247, 249, 252, .94); backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(223, 229, 239, .9);
}
.nav { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 26px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: .02em; }
.brand img { width: 42px; height: 42px; object-fit: cover; border-radius: 12px; }
.brand span { font-size: 20px; }
.nav-links { display: flex; align-items: center; gap: 24px; font-size: 14px; color: #46516c; }
.nav-links a { padding: 7px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--cyan); border-color: var(--cyan); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; border: 0; cursor: pointer; font: inherit; font-weight: 700; border-radius: 12px; transition: .2s ease; }
.nav-cta { padding: 10px 17px; color: #fff; background: var(--ink); }
.nav-cta:hover, .button:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(14, 165, 233, .24); }
.button { padding: 13px 21px; color: #fff; background: var(--cyan); }
.button.alt { color: var(--ink); background: #fff; border: 1px solid var(--line); }
.button.orange { background: var(--orange); }
.hero { position: relative; overflow: hidden; padding: 92px 0 76px; background: #eef8fb; }
.hero::before { content: ""; position: absolute; width: 460px; height: 460px; right: -160px; top: -180px; border: 70px solid rgba(14,165,233,.11); border-radius: 50%; }
.hero::after { content: ""; position: absolute; width: 220px; height: 220px; left: -85px; bottom: -120px; border: 32px solid rgba(251,146,60,.14); border-radius: 50%; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(330px, .9fr); gap: 70px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan); font-size: 13px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 24px; height: 3px; border-radius: 2px; background: var(--orange); }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h1 { max-width: 650px; margin-top: 17px; font-size: clamp(40px, 6vw, 68px); letter-spacing: -.04em; }
.hero-lede { max-width: 650px; margin: 24px 0 0; color: #4b5875; font-size: 17px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
.hero-note { display: flex; align-items: center; gap: 9px; margin-top: 17px; color: var(--muted); font-size: 13px; }
.hero-note svg { flex: 0 0 auto; color: var(--cyan); }
.hero-art { position: relative; min-height: 380px; }
.phone-stack { position: absolute; inset: 0; display: flex; justify-content: center; align-items: center; }
.phone { width: min(220px, 48%); padding: 8px; border: 1px solid rgba(255,255,255,.82); border-radius: 27px; background: #111a33; box-shadow: 0 22px 55px rgba(17,26,51,.25); }
.phone img { width: 100%; border-radius: 20px; }
.phone.back { transform: translate(-75px, 28px) rotate(-8deg); opacity: .92; }
.phone.front { transform: translate(64px, -18px) rotate(7deg); z-index: 1; }
.orbit-label { position: absolute; right: 5%; top: 6%; padding: 9px 13px; border: 1px solid #c6edf9; border-radius: 999px; color: #087ea9; background: rgba(255,255,255,.86); font-size: 12px; font-weight: 700; }
.section { padding: 90px 0; }
.section.alt { background: #fff; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section-kicker { color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.section h2 { margin-top: 8px; font-size: clamp(28px, 4vw, 42px); letter-spacing: -.03em; }
.section-intro { max-width: 590px; margin: 0; color: var(--muted); font-size: 15px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-card, .info-card, .quote-card, .faq-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.feature-card { min-height: 220px; padding: 25px; }
.feature-card:nth-child(2) { background: #f0fbff; border-color: #c8eef9; }
.feature-card:nth-child(3) { background: #fff7eb; border-color: #f9dfbf; }
.feature-index { display: inline-grid; place-items: center; width: 38px; height: 38px; color: var(--cyan); background: var(--cyan-soft); border-radius: 11px; font-size: 13px; font-weight: 800; }
.feature-card h3 { margin-top: 21px; font-size: 20px; }
.feature-card p { margin: 11px 0 0; color: var(--muted); font-size: 14px; }
.split { display: grid; grid-template-columns: .8fr 1.2fr; gap: 55px; align-items: center; }
.split-copy p { color: var(--muted); }
.metric-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 28px; }
.metric { padding: 14px 16px; border-left: 3px solid var(--cyan); background: #f4fbfd; }
.metric strong { display: block; font-size: 22px; }
.metric span { color: var(--muted); font-size: 12px; }
.screens { display: flex; justify-content: center; gap: 18px; align-items: flex-end; }
.screen-card { width: min(31%, 190px); padding: 7px; background: var(--ink); border-radius: 21px; box-shadow: var(--shadow); }
.screen-card:nth-child(2) { transform: translateY(-25px); }
.screen-card img { width: 100%; border-radius: 16px; }
.screen-card figcaption { padding: 8px 4px 3px; color: #d8e7f3; font-size: 11px; text-align: center; }
.path-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.info-card { display: flex; align-items: start; gap: 16px; padding: 23px; }
.info-card .round { display: grid; place-items: center; flex: 0 0 36px; height: 36px; border-radius: 50%; color: #fff; background: var(--violet); font-weight: 800; }
.info-card h3 { font-size: 18px; }
.info-card p { margin: 7px 0 0; color: var(--muted); font-size: 14px; }
.quote-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.quote-card { padding: 23px; }
.quote-card p { margin: 0; color: #3f4c68; font-size: 15px; }
.quote-card cite { display: block; margin-top: 18px; color: var(--muted); font-size: 12px; font-style: normal; }
.download-band { padding: 42px 0; color: #fff; background: var(--ink); }
.download-row { display: flex; align-items: center; justify-content: space-between; gap: 26px; }
.download-row h2 { font-size: 30px; }
.download-row p { margin: 8px 0 0; color: #b8c5dc; font-size: 14px; }
.footer { padding: 45px 0 25px; color: #69758e; background: #101a33; font-size: 13px; }
.footer-top { display: flex; justify-content: space-between; gap: 35px; padding-bottom: 28px; border-bottom: 1px solid rgba(255,255,255,.12); }
.footer .brand { color: #fff; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a:hover { color: #fff; }
.disclaimer { max-width: 680px; margin: 20px 0 0; color: #9aa9c3; }
.copyright { margin: 22px 0 0; color: #71819e; font-size: 12px; }
.page-hero { padding: 72px 0 60px; background: #eaf8fb; border-bottom: 1px solid #d8edf2; }
.page-hero h1 { max-width: 820px; font-size: clamp(38px, 5vw, 58px); }
.page-hero p { max-width: 760px; margin: 18px 0 0; color: var(--muted); font-size: 16px; }
.article { max-width: 860px; }
.article h2 { margin-top: 48px; font-size: 30px; }
.article h3 { margin-top: 30px; font-size: 20px; }
.article p { margin: 14px 0; color: #4e5b73; }
.article ul { margin: 16px 0; padding-left: 22px; color: #4e5b73; }
.article li + li { margin-top: 8px; }
.step-list { display: grid; gap: 13px; margin-top: 25px; }
.step { display: grid; grid-template-columns: 44px 1fr; gap: 15px; padding: 19px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.step-number { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 13px; color: #fff; background: var(--cyan); font-weight: 800; }
.step h3 { margin: 0; font-size: 18px; }
.step p { margin: 5px 0 0; font-size: 14px; }
.faq-list { display: grid; gap: 12px; margin-top: 28px; }
.faq-item { padding: 0 21px; }
.faq-item summary { padding: 19px 0; cursor: pointer; list-style: none; font-weight: 700; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; color: var(--cyan); font-size: 23px; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 0 19px; color: var(--muted); font-size: 14px; }
.notice { margin-top: 27px; padding: 19px 21px; border-left: 4px solid var(--orange); color: #5b4a37; background: var(--orange-soft); }
.mobile-toggle { display: none; border: 0; color: var(--ink); background: transparent; font-size: 24px; cursor: pointer; }
@media (max-width: 850px) {
  .container { width: min(100% - 28px, 680px); }
  .nav { height: 68px; }
  .mobile-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; padding: 14px 20px 20px; flex-direction: column; align-items: stretch; background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 0; }
  .nav-cta { display: none; }
  .hero { padding: 59px 0 40px; }
  .hero-grid, .split { grid-template-columns: 1fr; gap: 32px; }
  .hero-art { min-height: 330px; }
  .section { padding: 66px 0; }
  .section-head { display: block; }
  .section-intro { margin-top: 15px; }
  .feature-grid, .quote-grid, .path-grid { grid-template-columns: 1fr; }
  .metric-row { margin-top: 20px; }
  .download-row, .footer-top { display: block; }
  .download-row .button { margin-top: 18px; }
  .footer-links { margin-top: 25px; }
}
@media (max-width: 480px) {
  h1 { font-size: 42px; }
  .hero-art { min-height: 275px; }
  .phone { width: 44%; }
  .phone.back { transform: translate(-47px, 20px) rotate(-8deg); }
  .phone.front { transform: translate(42px, -12px) rotate(7deg); }
  .screens { gap: 8px; }
  .screen-card { width: 31%; border-radius: 15px; padding: 5px; }
  .screen-card img { border-radius: 11px; }
  .screen-card figcaption { font-size: 9px; }
  .metric strong { font-size: 18px; }
}