:root {
  --ink: #101d2d;
  --ink-2: #17283b;
  --paper: #f4f8f7;
  --muted: #617080;
  --line: #d9e4e3;
  --mint: #59d4c2;
  --sky: #48a9f8;
  --sun: #f7b955;
  --white: #fff;
  --shadow: 0 20px 50px rgba(16, 29, 45, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; color: var(--ink); background: var(--paper); line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.topbar { position: sticky; top: 0; z-index: 20; background: rgba(16, 29, 45, .96); border-bottom: 1px solid rgba(255,255,255,.09); backdrop-filter: blur(14px); }
.nav { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--white); font-weight: 700; letter-spacing: .08em; }
.brand img { width: 50px; height: auto; }
.brand-name { font-size: 16px; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: 22px; color: #c6d6df; font-size: 14px; }
.nav-links a { padding: 8px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--white); border-color: var(--mint); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 10px; padding: 12px 19px; font-weight: 700; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.nav-cta, .button-primary { background: var(--sun); color: #1f2b36; box-shadow: 0 8px 20px rgba(247,185,85,.22); }
.button-secondary { border: 1px solid rgba(255,255,255,.28); color: var(--white); background: transparent; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(16,29,45,.16); }
.menu-toggle { display: none; background: transparent; border: 1px solid rgba(255,255,255,.3); color: white; border-radius: 8px; padding: 8px 10px; }
.hero { background: radial-gradient(circle at 85% 15%, rgba(72,169,248,.25), transparent 34%), linear-gradient(130deg, #101d2d 0%, #153149 58%, #1d4651 100%); color: var(--white); padding: 92px 0 84px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.07fr .93fr; gap: 60px; align-items: center; }
.eyebrow { color: var(--mint); text-transform: uppercase; letter-spacing: .18em; font-size: 12px; font-weight: 700; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 18px; letter-spacing: -.02em; }
h1 { font-size: clamp(38px, 6vw, 66px); max-width: 620px; }
h2 { font-size: clamp(28px, 4vw, 42px); }
h3 { font-size: 20px; }
.hero p { color: #c8d7df; font-size: 18px; max-width: 620px; margin: 0 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-note { color: #a6bdc9; font-size: 13px; margin-top: 16px; }
.orbit { position: relative; min-height: 380px; display: grid; place-items: center; }
.orbit::before, .orbit::after { content: ""; position: absolute; border: 1px solid rgba(89,212,194,.4); border-radius: 50%; transform: rotate(-18deg); }
.orbit::before { width: 360px; height: 190px; }
.orbit::after { width: 285px; height: 150px; border-color: rgba(247,185,85,.5); transform: rotate(28deg); }
.phone-stack { position: relative; z-index: 1; display: flex; gap: 14px; align-items: flex-end; }
.phone { width: 164px; padding: 8px; background: #0b1420; border: 1px solid rgba(255,255,255,.24); border-radius: 24px; box-shadow: 0 22px 40px rgba(0,0,0,.3); }
.phone img { width: 100%; aspect-ratio: 9/16; object-fit: cover; border-radius: 17px; }
.phone:nth-child(2) { transform: translateY(-34px); }
.section { padding: 90px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 36px; }
.section-head p { max-width: 530px; margin: 0; color: var(--muted); }
.kicker { color: #258f94; font-size: 13px; font-weight: 700; letter-spacing: .16em; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { background: var(--white); border: 1px solid var(--line); border-radius: 14px; padding: 26px; box-shadow: 0 8px 22px rgba(16,29,45,.04); }
.feature-icon { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: #e5f7f4; color: #137f81; font-weight: 800; margin-bottom: 18px; }
.feature p { color: var(--muted); margin: 0; font-size: 14px; }
.dark-band { background: var(--ink); color: var(--white); }
.dark-band .section-head p { color: #a8bbc6; }
.shot-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; align-items: end; }
.shot { background: #0b1420; border: 1px solid rgba(255,255,255,.14); border-radius: 16px; padding: 9px; }
.shot:nth-child(2), .shot:nth-child(4) { transform: translateY(24px); }
.shot img { width: 100%; max-width: 400px; aspect-ratio: 9 / 16; object-fit: cover; border-radius: 10px; }
.shot figcaption { color: #aec4cf; font-size: 12px; padding: 10px 4px 3px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { padding: 26px 20px; text-align: center; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-size: 30px; color: #258f94; }
.stat span { color: var(--muted); font-size: 13px; }
.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 42px; align-items: start; }
.panel { background: var(--white); border: 1px solid var(--line); border-radius: 14px; padding: 28px; }
.list { display: grid; gap: 14px; padding: 0; margin: 0; list-style: none; }
.list li { display: flex; gap: 12px; align-items: flex-start; color: var(--muted); }
.list b { display: grid; place-items: center; width: 24px; height: 24px; flex: 0 0 24px; border-radius: 50%; background: #e5f7f4; color: #137f81; font-size: 12px; }
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.quote { background: #e9f6f5; border: 1px solid #cce9e5; border-radius: 12px; padding: 23px; }
.quote p { margin: 0 0 12px; color: #24434b; }
.quote cite { color: #258f94; font-size: 13px; font-style: normal; font-weight: 700; }
.faq-list { display: grid; gap: 10px; }
details { background: var(--white); border: 1px solid var(--line); border-radius: 10px; padding: 17px 20px; }
summary { cursor: pointer; font-weight: 700; }
details p { color: var(--muted); margin: 12px 0 0; }
.page-hero { background: linear-gradient(120deg, #101d2d, #1a4650); color: white; padding: 72px 0 66px; }
.page-hero h1 { font-size: clamp(34px, 5vw, 56px); }
.page-hero p { color: #c8d7df; max-width: 700px; margin: 0; font-size: 17px; }
.prose { max-width: 820px; }
.prose h2 { margin-top: 48px; font-size: 30px; }
.prose h3 { margin-top: 28px; }
.prose p { color: #415465; margin: 0 0 17px; }
.prose ul, .prose ol { color: #415465; padding-left: 23px; }
.prose li { margin: 7px 0; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 32px 0 40px; }
.step { padding: 20px; background: var(--white); border: 1px solid var(--line); border-top: 3px solid var(--mint); border-radius: 10px; }
.step b { color: #258f94; font-size: 13px; }
.step p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.notice { border-left: 4px solid var(--sun); background: #fff8e9; padding: 18px 20px; color: #5c4a2b; border-radius: 0 10px 10px 0; }
.footer { background: #0b1420; color: #a9bbc6; padding: 44px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 30px; }
.footer h3 { color: white; font-size: 16px; }
.footer p { margin: 0; font-size: 13px; }
.footer a { color: #cbe2e5; }
.footer-bottom { margin-top: 30px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12px; }
.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; }
@media (max-width: 850px) {
  .nav-links { position: absolute; left: 20px; right: 20px; top: 70px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 18px; background: var(--ink-2); border: 1px solid rgba(255,255,255,.14); border-radius: 10px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 0; }
  .menu-toggle { display: block; }
  .nav-cta { display: none; }
  .hero-grid, .split { grid-template-columns: 1fr; }
  .orbit { min-height: 300px; }
  .feature-grid, .quote-grid { grid-template-columns: 1fr 1fr; }
  .shot-grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .wrap { width: min(100% - 28px, 1160px); }
  .brand img { width: 124px; }
  .brand-name { display: none; }
  .hero { padding: 64px 0 54px; }
  .hero p { font-size: 16px; }
  .phone { width: 135px; }
  .feature-grid, .quote-grid, .shot-grid, .steps, .footer-grid { grid-template-columns: 1fr; }
  .shot:nth-child(2), .shot:nth-child(4) { transform: none; }
  .section { padding: 64px 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 12px; }
}