:root {
  --ink: #111827;
  --night: #101a2e;
  --night-2: #172744;
  --paper: #f7fafc;
  --muted: #64748b;
  --line: #dbe5ef;
  --cyan: #2dd4bf;
  --sky: #38bdf8;
  --coral: #fb7185;
  --yellow: #facc15;
  --radius: 16px;
  --shadow: 0 18px 50px rgba(15, 23, 42, .12);
}

* { 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(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(16, 26, 46, .94);
  border-bottom: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(16px);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: #fff; font-weight: 800; letter-spacing: .04em; }
.brand img { width: 34px; height: 34px; }
.brand-name { font-size: 18px; }
.nav-links { display: flex; align-items: center; gap: 24px; color: #c8d5e9; font-size: 14px; }
.nav-links a { transition: color .2s ease; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--cyan); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 999px; font-weight: 700; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.nav-cta { padding: 9px 16px; color: var(--night); background: var(--cyan); }
.button { padding: 13px 24px; color: var(--night); background: var(--cyan); box-shadow: 0 10px 24px rgba(45,212,191,.22); }
.button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 13px 28px rgba(45,212,191,.28); }
.button.alt { color: #fff; background: transparent; border: 1px solid rgba(255,255,255,.35); box-shadow: none; }
.menu-toggle { display: none; border: 0; background: transparent; color: #fff; font-size: 25px; cursor: pointer; }

.hero { color: #fff; background: var(--night); overflow: hidden; }
.hero-inner { min-height: 600px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 56px; padding: 72px 0 84px; }
.eyebrow { margin: 0 0 14px; color: var(--cyan); font-size: 13px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: -.02em; }
h1 { max-width: 620px; font-size: clamp(38px, 6vw, 70px); }
.hero-copy { max-width: 610px; margin: 20px 0 28px; color: #c8d5e9; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 26px; color: #9db0ca; font-size: 13px; }
.hero-notes span { display: inline-flex; align-items: center; gap: 7px; }
.hero-notes i { width: 7px; height: 7px; border-radius: 50%; background: var(--coral); }
.hero-art { position: relative; min-height: 390px; display: grid; place-items: center; }
.hero-orbit { position: absolute; width: 390px; height: 390px; border: 1px solid rgba(45,212,191,.35); border-radius: 50%; }
.hero-orbit::after { content: ""; position: absolute; inset: 36px; border: 1px dashed rgba(56,189,248,.38); border-radius: 50%; }
.phone { position: relative; width: 246px; padding: 10px; border: 8px solid #263957; border-radius: 34px; background: #07111f; box-shadow: 0 34px 70px rgba(0,0,0,.45); transform: rotate(5deg); }
.phone-screen { overflow: hidden; border-radius: 20px; background: #eef7f8; }
.phone-top { height: 22px; background: #0d1c30; }
.phone-banner { height: 102px; padding: 14px; color: #fff; background: linear-gradient(135deg, #0f766e, #38bdf8); }
.phone-banner strong { display: block; font-size: 14px; }
.phone-banner small { color: rgba(255,255,255,.78); font-size: 10px; }
.phone-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; padding: 12px; }
.phone-card { height: 80px; border-radius: 9px; background: linear-gradient(150deg, #fb7185, #facc15); }
.phone-card:nth-child(2) { background: linear-gradient(150deg, #38bdf8, #818cf8); }
.phone-card:nth-child(3) { background: linear-gradient(150deg, #34d399, #2dd4bf); }
.phone-label { padding: 0 12px 15px; color: #334155; font-size: 11px; font-weight: 700; }

.section { padding: 88px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 34px; }
.section-head h2 { font-size: clamp(28px, 4vw, 44px); }
.section-head p { max-width: 470px; margin: 0; color: var(--muted); }
.section-kicker { margin: 0 0 10px; color: #0f766e; font-size: 13px; font-weight: 800; letter-spacing: .15em; }
.stats { background: #fff; border-bottom: 1px solid var(--line); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 26px 20px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; color: var(--night); font-size: 29px; }
.stat span { color: var(--muted); font-size: 13px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-card { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 8px 22px rgba(15,23,42,.04); }
.feature-icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 20px; border-radius: 12px; color: var(--night); font-size: 19px; font-weight: 900; background: #ccfbf1; }
.feature-card:nth-child(2) .feature-icon { background: #dbeafe; }
.feature-card:nth-child(3) .feature-icon { background: #ffe4e6; }
.feature-card:nth-child(4) .feature-icon { background: #fef3c7; }
.feature-card h3 { margin-bottom: 10px; font-size: 19px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; }
.screens { background: #eaf4f4; }
.screen-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: start; }
.screen-item { overflow: hidden; border: 1px solid #cde3e3; border-radius: 14px; background: #fff; }
.screen-item img { width: 100%; max-width: 400px; margin: 0 auto; }
.screen-item figcaption { padding: 14px 16px 18px; color: #475569; font-size: 13px; }
.split-band { color: #fff; background: var(--night-2); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; align-items: center; }
.split h2 { font-size: clamp(28px, 4vw, 43px); }
.split p { color: #c8d5e9; }
.check-list { display: grid; gap: 12px; margin: 24px 0 30px; padding: 0; list-style: none; color: #e1eaf5; }
.check-list li::before { content: "✓"; display: inline-grid; width: 22px; height: 22px; margin-right: 10px; place-items: center; border-radius: 50%; color: var(--night); background: var(--cyan); font-size: 12px; font-weight: 900; }
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.quote { padding: 24px; border-left: 3px solid var(--coral); background: #fff; box-shadow: 0 8px 25px rgba(15,23,42,.05); }
.quote p { margin: 0 0 14px; color: #334155; }
.quote cite { color: var(--muted); font-size: 13px; font-style: normal; }
.faq-list { display: grid; gap: 10px; }
details { padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.page-hero { padding: 92px 0 74px; color: #fff; background: var(--night); }
.page-hero h1 { font-size: clamp(36px, 6vw, 62px); }
.page-hero p { max-width: 690px; margin: 18px 0 0; color: #c8d5e9; font-size: 17px; }
.article { max-width: 850px; margin: 0 auto; }
.article section { padding: 54px 0 0; }
.article h2 { margin-bottom: 16px; font-size: 28px; }
.article p { margin: 0 0 16px; color: #475569; }
.article ul, .article ol { margin: 12px 0 0; padding-left: 22px; color: #475569; }
.article li { margin: 7px 0; }
.tip { padding: 18px 20px; border-left: 3px solid var(--cyan); background: #ecfeff; color: #155e75; }
.site-footer { padding: 42px 0 26px; color: #a9bad0; background: #0b1424; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 36px; padding-bottom: 28px; }
.footer-grid h3 { margin-bottom: 13px; color: #fff; font-size: 16px; }
.footer-grid p, .footer-grid a { margin: 0; color: #a9bad0; font-size: 13px; }
.footer-links { display: grid; gap: 8px; }
.copyright { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12px; }

[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (max-width: 820px) {
  .container { width: min(100% - 28px, 680px); }
  .menu-toggle { display: block; }
  .nav-links { position: absolute; top: 72px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 20px 18px; background: var(--night); }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 11px 0; }
  .nav-cta { margin-top: 7px; text-align: center; }
  .hero-inner, .split { grid-template-columns: 1fr; gap: 26px; }
  .hero-inner { min-height: 0; padding: 65px 0 70px; }
  .hero-art { min-height: 330px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .feature-grid, .screen-grid, .quote-grid { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 12px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  h1 { font-size: 39px; }
  .hero-copy { font-size: 15px; }
  .hero-art { transform: scale(.86); margin: -20px 0; }
  .footer-grid { grid-template-columns: 1fr; }
}