:root {
  --ink: #183b3b;
  --muted: #607878;
  --accent: #00b894;
  --accent-dark: #087f6a;
  --surface: #ffffff;
  --soft: #eef6f4;
  --line: #d8e7e3;
  --bg: #f7faf9;
  --warning: #f4a261;
}

* { 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(--bg);
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.nav-wrap, .container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .04em; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; }
.nav-links a { padding: 8px 12px; border-radius: 8px; color: #42605e; font-size: 14px; }
.nav-links a:hover, .nav-links a.active { background: var(--soft); color: var(--accent-dark); }
.hero { padding: 72px 0 48px; background: linear-gradient(180deg, #e9f8f3 0%, var(--bg) 100%); }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 42px; align-items: center; }
.eyebrow { color: var(--accent-dark); font-weight: 700; font-size: 14px; letter-spacing: .12em; text-transform: uppercase; }
h1 { font-size: clamp(32px, 5vw, 54px); line-height: 1.18; margin: 12px 0 18px; letter-spacing: 0; }
h2 { font-size: clamp(22px, 3vw, 30px); line-height: 1.3; margin: 0 0 20px; letter-spacing: 0; }
h3 { font-size: 18px; margin: 0 0 8px; }
.lead { max-width: 650px; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 20px; border-radius: 8px; border: 1px solid var(--accent); font-weight: 700; cursor: pointer; transition: .2s ease; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(0,184,148,.2); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn-ghost { color: var(--accent-dark); background: #fff; }
.btn-ghost:hover { background: var(--soft); }
.hero-shot { width: min(250px, 100%); justify-self: end; border-radius: 16px; border: 1px solid var(--line); box-shadow: 0 18px 40px rgba(30,81,73,.14); }
.section { padding: 62px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.section-head p { margin: 0; color: var(--muted); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 24px; box-shadow: 0 8px 24px rgba(40,88,80,.05); }
.card p { margin: 8px 0 0; color: var(--muted); }
.icon { width: 36px; height: 36px; border-radius: 8px; background: var(--soft); color: var(--accent-dark); display: grid; place-items: center; margin-bottom: 14px; font-weight: 800; }
.stat-row { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; margin-top: 24px; }
.stat { padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }
.stat strong { display: block; font-size: 26px; color: var(--accent-dark); }
.hero .stat time { display: block; font-size: 18px; white-space: nowrap; letter-spacing: 0; }
.stat span { color: var(--muted); font-size: 13px; }
.timeline { display: grid; gap: 14px; }
.timeline-item { display: grid; grid-template-columns: 100px 1fr; gap: 18px; align-items: start; padding-bottom: 14px; border-bottom: 1px dashed var(--line); }
.timeline-item time { color: var(--accent-dark); font-weight: 700; }
.checklist { display: grid; gap: 12px; padding: 0; margin: 0; list-style: none; }
.checklist li { position: relative; padding-left: 28px; color: var(--muted); }
.checklist li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--accent); font-weight: 800; }
.faq-list { display: grid; gap: 12px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 16px 18px; }
summary { cursor: pointer; font-weight: 700; }
details p { color: var(--muted); margin: 10px 0 0; }
.quote { border-left: 3px solid var(--accent); padding-left: 16px; color: #355452; }
.quote strong { display: block; margin-top: 8px; color: var(--accent-dark); }
.quote time { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; }
.page-hero { padding: 58px 0 34px; background: #e9f8f3; border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 780px; font-size: clamp(30px, 5vw, 48px); }
.content { max-width: 860px; }
.content p { color: var(--muted); }
.content ul, .content ol { color: var(--muted); padding-left: 22px; }
.note { padding: 16px 18px; background: #fff8ef; border: 1px solid #f6d1a9; border-radius: 8px; color: #845229; }
.download-band { margin-top: 18px; padding: 26px; background: var(--ink); color: #fff; border-radius: 8px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.download-band p { margin: 4px 0 0; color: #b8d2ce; }
.site-footer { margin-top: 40px; padding: 34px 0 24px; border-top: 1px solid var(--line); background: #edf5f2; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 22px; }
.site-footer p, .site-footer a { color: #617b78; font-size: 14px; }
.footer-bottom { margin-top: 24px; padding-top: 14px; border-top: 1px solid var(--line); color: #78908d; font-size: 13px; }
.tag { display: inline-block; margin: 4px 5px 0 0; padding: 4px 10px; border-radius: 999px; background: var(--soft); color: var(--accent-dark); font-size: 13px; }
@media (max-width: 820px) {
  .nav-wrap { align-items: flex-start; padding: 12px 0; flex-direction: column; }
  .nav-links { justify-content: flex-start; }
  .hero-grid, .grid-3 { grid-template-columns: 1fr; }
  .hero-shot { justify-self: start; max-width: 320px; }
  .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(2,1fr); }
  .download-band { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 480px) {
  .nav-links a { padding: 7px 8px; font-size: 13px; }
  .hero { padding-top: 44px; }
  .section { padding: 44px 0; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .hero .stat time { font-size: 15px; }
}