:root {
  --bg: #f7f9ff;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5b667a;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #14b8a6;
  --border: #dfe6f3;
  --shadow: 0 20px 50px rgba(22, 34, 66, .08);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #e6f0ff 0, transparent 34rem), var(--bg);
  line-height: 1.75;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(223,230,243,.8);
}
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; }
.logo-mark { display: grid; place-items: center; width: 38px; height: 38px; color: #fff; border-radius: 12px; background: linear-gradient(135deg, var(--primary), var(--accent)); }
.nav-links { display: flex; align-items: center; gap: 22px; color: var(--muted); font-weight: 600; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-toggle { display: none; border: 0; background: var(--primary); color: #fff; padding: 9px 12px; border-radius: 12px; }

.hero { padding: 88px 0 58px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 42px; align-items: center; }
.eyebrow { display: inline-flex; gap: 8px; align-items: center; color: var(--primary); background: #eaf1ff; border: 1px solid #d8e6ff; padding: 7px 12px; border-radius: 999px; font-weight: 700; font-size: 14px; }
h1 { font-size: clamp(34px, 5vw, 62px); line-height: 1.12; margin: 22px 0; letter-spacing: -.04em; }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 28px; }
.hero-actions, .section-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 8px; padding: 13px 20px; border-radius: 14px; font-weight: 800; border: 1px solid transparent; }
.button.primary { color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); box-shadow: 0 12px 24px rgba(37,99,235,.24); }
.button.secondary { color: var(--primary); background: #fff; border-color: #cfe0ff; }
.button:hover { transform: translateY(-1px); }
.hero-proof { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; color: var(--muted); font-size: 14px; }
.hero-proof span { padding: 8px 12px; background: rgba(255,255,255,.72); border: 1px solid var(--border); border-radius: 999px; }

.hero-card { background: var(--surface); border: 1px solid var(--border); border-radius: 30px; padding: 26px; box-shadow: var(--shadow); }
.score-card { display: grid; gap: 14px; }
.score-row { display: flex; justify-content: space-between; gap: 16px; padding: 14px; border-radius: 16px; background: #f5f8ff; }
.score-row strong { color: var(--primary); }
.audit-list { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.audit-list li { padding-left: 28px; position: relative; color: var(--muted); }
.audit-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 900; }

section { padding: 68px 0; }
.section-head { max-width: 760px; margin-bottom: 30px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
h2 { font-size: clamp(28px, 4vw, 42px); line-height: 1.22; margin: 0 0 14px; letter-spacing: -.03em; }
h3 { font-size: 21px; margin: 0 0 10px; }
.section-head p, .card p, .step p, .faq p, .case-card p { color: var(--muted); margin: 0; }
.grid { display: grid; gap: 20px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.card, .case-card, .faq, .step, .contact-box, .article-block { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: 0 12px 30px rgba(22,34,66,.05); }
.card .icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; color: #fff; background: linear-gradient(135deg, var(--primary), var(--accent)); font-weight: 900; margin-bottom: 18px; }

.band { background: #0f1b33; color: #fff; }
.band p, .band .muted { color: #cbd5e1; }
.band .card, .band .step, .band .case-card, .band .faq, .band .contact-box, .band .article-block { color: var(--text); }
.band .card p, .band .step p, .band .case-card p, .band .faq p, .band .contact-box p, .band .article-block p { color: var(--muted); }
.comparison { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: 18px; background: #fff; }
.comparison th, .comparison td { padding: 16px; border: 1px solid #e5e7eb; text-align: left; vertical-align: top; }
.comparison th { background: #eff6ff; color: #0f172a; }
.comparison td { color: #334155; }

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { position: relative; padding-top: 58px; }
.step::before { counter-increment: step; content: counter(step); position: absolute; top: 20px; left: 24px; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 10px; background: #eaf1ff; color: var(--primary); font-weight: 900; }

.faq-list { display: grid; gap: 14px; }
details.faq summary { cursor: pointer; font-weight: 800; font-size: 18px; }
details.faq p { margin-top: 12px; }

.cta { text-align: center; background: linear-gradient(135deg, #2563eb, #14b8a6); color: #fff; border-radius: 34px; padding: 46px 24px; box-shadow: var(--shadow); }
.cta p { color: #e9fbff; max-width: 720px; margin: 0 auto 24px; }
.cta .button { background: #fff; color: var(--primary); }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-panel { display: grid; grid-template-columns: minmax(0, 1.15fr) 360px; gap: 28px; align-items: center; background: #fff; border: 1px solid var(--border); border-radius: 34px; padding: 34px; box-shadow: var(--shadow); }
.contact-copy h2 { font-size: clamp(30px, 4vw, 46px); line-height: 1.18; margin: 18px 0 14px; letter-spacing: -.03em; }
.contact-copy p { color: var(--muted); font-size: 18px; margin: 0 0 22px; }
.contact-methods { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 22px 0; }
.contact-methods div { border: 1px solid var(--border); border-radius: 18px; padding: 16px; background: #f8fbff; }
.contact-methods strong, .contact-methods span { display: block; }
.contact-methods span { color: var(--muted); margin-top: 4px; }
.qr-card { background: linear-gradient(180deg, #f8fbff, #ffffff); border: 1px solid var(--border); border-radius: 28px; padding: 24px; text-align: center; box-shadow: 0 16px 36px rgba(22,34,66,.08); }
.wechat-qr { width: min(100%, 300px); height: auto; margin: 0 auto; border-radius: 20px; background: #fff; }
.qr-card p { color: var(--muted); margin: 16px 0 0; font-weight: 700; }
.qr-placeholder { display: grid; place-items: center; min-height: 220px; border: 2px dashed #b6c5dc; border-radius: 20px; color: var(--muted); text-align: center; background: #f8fbff; }

.article { max-width: 860px; margin: 0 auto; }
.article p, .article li { color: var(--muted); }
.article ul, .article ol { padding-left: 22px; }

.site-footer { padding: 38px 0; border-top: 1px solid var(--border); color: var(--muted); background: #fff; }
.footer-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.back-top { position: fixed; right: 18px; bottom: 18px; width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 900; box-shadow: var(--shadow); cursor: pointer; opacity: 0; pointer-events: none; transition: .2s; }
.back-top.show { opacity: 1; pointer-events: auto; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-links { position: absolute; left: 16px; right: 16px; top: 74px; display: none; flex-direction: column; align-items: stretch; background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 16px; box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .hero { padding-top: 48px; }
  .hero-grid, .grid.three, .grid.two, .steps, .contact-grid, .contact-panel { grid-template-columns: 1fr; }
  .contact-panel { padding: 24px; }
  .contact-methods { grid-template-columns: 1fr; }
  section { padding: 46px 0; }
}