:root {
  --ink: #17211f;
  --muted: #5f6d69;
  --line: #dfe8e5;
  --paper: #ffffff;
  --soft: #f3f7f5;
  --teal: #0f8f7e;
  --teal-dark: #086b5f;
  --navy: #112c2a;
  --gold: #d8ad63;
  --shadow: 0 18px 60px rgba(14, 50, 44, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; line-height: 1.7; }
img { max-width: 100%; display: block; }
a { color: inherit; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.narrow { max-width: 900px; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(18, 58, 52, .08); background: rgba(255,255,255,.92); backdrop-filter: blur(14px); }
.nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 18px; letter-spacing: .02em; }
.brand small { margin-top: 1px; color: var(--muted); font-size: 12px; }
.brand-mark { width: 42px; height: 42px; position: relative; border: 2px solid var(--ink); border-radius: 11px; }
.brand-mark::before, .brand-mark::after, .brand-mark i::before, .brand-mark i::after { content: ""; position: absolute; width: 10px; height: 10px; border-color: var(--ink); }
.brand-mark::before { left: 7px; top: 7px; border-left: 2px solid; border-top: 2px solid; }
.brand-mark::after { right: 7px; top: 7px; border-right: 2px solid; border-top: 2px solid; }
.brand-mark i::before { left: 7px; bottom: 7px; border-left: 2px solid; border-bottom: 2px solid; }
.brand-mark i::after { right: 7px; bottom: 7px; border-right: 2px solid; border-bottom: 2px solid; }
nav { display: flex; gap: 26px; }
nav a { color: #40504c; font-size: 14px; text-decoration: none; }
nav a:hover { color: var(--teal); }

.hero { overflow: hidden; position: relative; padding: 98px 0 88px; background: radial-gradient(circle at 85% 8%, rgba(15,143,126,.18), transparent 31%), linear-gradient(135deg, #f8fbfa, #edf6f2); }
.hero::after { content: ""; position: absolute; width: 280px; height: 280px; right: -110px; bottom: -150px; border: 1px solid rgba(15,143,126,.25); border-radius: 50%; box-shadow: 0 0 0 34px rgba(15,143,126,.045), 0 0 0 70px rgba(15,143,126,.035); }
.hero-grid { display: grid; grid-template-columns: 1.35fr .8fr; align-items: center; gap: 70px; position: relative; z-index: 1; }
.eyebrow { margin: 0 0 14px; color: var(--teal); font-size: 13px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
h1 { margin: 0; max-width: 720px; font-size: clamp(42px, 6vw, 74px); line-height: 1.12; letter-spacing: -.045em; }
.hero-copy { max-width: 700px; margin: 26px 0 0; color: #43534f; font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { padding: 12px 20px; border-radius: 10px; font-size: 14px; font-weight: 700; text-decoration: none; transition: .2s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: #fff; background: var(--teal); box-shadow: 0 10px 24px rgba(15,143,126,.22); }
.button.secondary { border: 1px solid #b9cac5; background: rgba(255,255,255,.75); }
.update { margin: 18px 0 0; color: #74817e; font-size: 12px; }
.identity-card { padding: 30px; border: 1px solid rgba(255,255,255,.75); border-radius: 18px; background: rgba(255,255,255,.83); box-shadow: var(--shadow); }
.status { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 20px; padding: 6px 10px; border-radius: 999px; color: var(--teal-dark); background: #e4f5ef; font-size: 12px; font-weight: 700; }
.status b { width: 7px; height: 7px; border-radius: 50%; background: #12a78f; }
.identity-card dl, .facts, .mini-facts { margin: 0; }
.identity-card dl div { padding: 13px 0; border-bottom: 1px solid var(--line); }
.identity-card dl div:last-child { border: 0; }
dt { color: var(--muted); font-size: 12px; }
dd { margin: 2px 0 0; font-weight: 700; }

.section { padding: 90px 0; }
.section.soft { background: var(--soft); }
.section.dark { color: #fff; background: var(--navy); }
.section-heading { max-width: 790px; margin-bottom: 38px; }
.section-heading.compact { margin-bottom: 30px; }
.section-heading h2 { margin: 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.25; letter-spacing: -.03em; }
.section-heading > p:last-child { color: var(--muted); }
.section-heading.light > p:last-child { color: #b8c9c5; }

.wechat-panel { display: grid; grid-template-columns: 1fr 380px; gap: 56px; align-items: center; padding: 42px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow); }
.steps ol { margin: 0; padding: 0; list-style: none; }
.steps li { display: flex; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.steps li > span { flex: 0 0 34px; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--teal); font-weight: 800; }
.steps strong { font-size: 17px; }
.steps p { margin: 2px 0 0; color: var(--muted); }
.channel-note { display: grid; gap: 5px; margin-top: 24px; padding: 16px 18px; border-radius: 12px; background: var(--soft); }
.channel-note a { color: var(--teal-dark); word-break: break-all; }
.qr-card { margin: 0; padding: 22px; border-radius: 18px; text-align: center; background: var(--soft); }
.qr-card img { width: 100%; border-radius: 12px; }
.qr-card figcaption { margin-top: 12px; color: var(--muted); font-size: 13px; }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.info-card { padding: 28px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.info-card h3 { margin: 0 0 18px; font-size: 22px; }
.facts div { display: grid; grid-template-columns: 130px 1fr; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.facts dd { font-size: 14px; }
.text-link { display: inline-block; margin-top: 20px; color: var(--teal-dark); font-size: 14px; font-weight: 700; }

.channel-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.channel-grid article { min-height: 210px; padding: 24px; border: 1px solid var(--line); border-radius: 14px; }
.number { color: var(--gold); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.channel-grid h3 { margin: 25px 0 8px; font-size: 20px; }
.channel-grid p { margin: 0; color: var(--muted); font-size: 14px; }
.channel-grid a { color: var(--teal-dark); }

.document-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.document-card { overflow: hidden; position: relative; min-height: 250px; border: 1px solid rgba(255,255,255,.14); border-radius: 14px; background: #fff; text-decoration: none; }
.document-card.wide { grid-column: span 2; }
.document-card img { width: 100%; height: 250px; object-fit: contain; background: #fff; }
.document-card span { display: block; padding: 12px 14px; color: #fff; background: #173b37; font-size: 13px; }
.authorization { display: grid; grid-template-columns: 1fr 340px; gap: 56px; align-items: center; margin-top: 56px; padding-top: 56px; border-top: 1px solid rgba(255,255,255,.16); }
.authorization h3 { margin: 0; font-size: 32px; }
.authorization p { color: #c8d4d1; }
.authorization-image { overflow: hidden; border-radius: 12px; box-shadow: 0 18px 46px rgba(0,0,0,.28); }
.mini-facts { display: grid; gap: 12px; margin-top: 24px; }
.mini-facts div { display: grid; grid-template-columns: 120px 1fr; }
.mini-facts dt { color: #91a7a2; }
.mini-facts dd { font-size: 14px; }
.disclaimer { font-size: 12px; }

details { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; padding: 22px 0; font-size: 18px; font-weight: 800; }
details p { margin: -6px 0 22px; color: var(--muted); }

footer { padding: 32px 0; color: #d4dfdc; background: #0a201e; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: end; }
footer p { margin: 5px 0 0; color: #9eb1ad; font-size: 12px; }

@media (max-width: 920px) {
  nav { display: none; }
  .hero { padding: 70px 0; }
  .hero-grid, .wechat-panel, .authorization { grid-template-columns: 1fr; }
  .hero-grid { gap: 36px; }
  .wechat-panel { padding: 28px; }
  .qr-card { max-width: 420px; }
  .info-grid { grid-template-columns: 1fr; }
  .channel-grid { grid-template-columns: 1fr 1fr; }
  .document-grid { grid-template-columns: 1fr 1fr; }
  .authorization-image { max-width: 420px; }
}

@media (max-width: 600px) {
  .container { width: min(100% - 28px, 1160px); }
  .nav-wrap { min-height: 66px; }
  h1 { font-size: 42px; }
  .hero-copy { font-size: 16px; }
  .section { padding: 66px 0; }
  .actions { display: grid; }
  .button { text-align: center; }
  .identity-card, .wechat-panel, .info-card { padding: 22px; }
  .channel-grid, .document-grid, .footer-grid { grid-template-columns: 1fr; }
  .channel-grid article { min-height: 0; }
  .document-card.wide { grid-column: auto; }
  .facts div, .mini-facts div { grid-template-columns: 1fr; gap: 2px; }
  .document-card img { height: 220px; }
}

@media print {
  .site-header, .actions { display: none; }
  .hero, .section { padding: 30px 0; }
  .dark { color: #111 !important; background: #fff !important; }
  .document-card span { color: #111; background: #eee; }
}
.brand-logo {
  width: 54px;
  height: 54px;
  object-fit: contain;
  flex: 0 0 auto;
  border-radius: 12px;
}