:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --ink: #0f172a;
  --muted: #5b6b7f;
  --line: #e3e8ef;
  --brand: #1e3a8a;
  --brand-2: #2563eb;
  --quant: #0f766e;
  --quant-2: #14b8a6;
  --warn-bg: #fff7ed;
  --warn-line: #fdba74;
  --warn-ink: #7c2d12;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
}
a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 0.5em; }
p { margin: 0 0 1em; }
img { max-width: 100%; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ---------- 原型提示条 ---------- */
.proto-banner {
  background: #eef2ff;
  color: #312e81;
  text-align: center;
  font-size: 13px;
  padding: 7px 12px;
  border-bottom: 1px solid #c7d2fe;
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.logo { font-weight: 700; font-size: 18px; color: var(--ink); }
.logo:hover { text-decoration: none; }
.logo-tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  background: #eef2f7;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: 2px;
}
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav a { color: var(--ink); font-size: 15px; }
.site-nav a.active { color: var(--brand); font-weight: 600; }
.site-nav .nav-cta {
  background: var(--brand);
  color: #fff;
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 14px;
}
.site-nav .nav-cta:hover { text-decoration: none; background: #172e6e; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; font-size: 20px; padding: 4px 10px; cursor: pointer; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 60px; color: #fff; }
.hero-pe {
  background: linear-gradient(135deg, #101d3f 0%, #1e3a8a 60%, #2563eb 100%);
}
.hero-quant {
  background: linear-gradient(135deg, #042f2e 0%, #0f766e 60%, #14b8a6 100%);
}
.hero-home {
  background: linear-gradient(135deg, #101d3f 0%, #1e3a8a 55%, #0f766e 120%);
}
.hero .eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 1px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 { font-size: 38px; margin-bottom: 16px; max-width: 760px; }
.hero p.lead { font-size: 17px; opacity: 0.92; max-width: 680px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 13px; opacity: 0.85; }

.btn {
  display: inline-block;
  border-radius: 999px;
  padding: 12px 26px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: #fff; color: var(--brand); box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18); }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.6); color: #fff; }
.btn-quant { background: #fff; color: var(--quant); box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18); }
.btn-dark { background: var(--brand); color: #fff; }
.btn-outline { border: 1px solid var(--line); color: var(--ink); background: var(--surface); }

.risk-banner {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  color: var(--warn-ink);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  max-width: 860px;
  margin-top: 22px;
}

/* ---------- 区块 ---------- */
.section { padding: 60px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 720px; margin-bottom: 36px; }
.section-head h2 { font-size: 28px; }
.section-head p { color: var(--muted); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 { font-size: 17px; }
.card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
.card .card-num { font-size: 12px; color: var(--brand-2); font-weight: 700; letter-spacing: 1px; }
.card-quant .card-num { color: var(--quant-2); }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; counter-reset: step; }
.step { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px 22px; }
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 18px;
  right: 20px;
  font-size: 34px;
  font-weight: 800;
  color: #e2e8f0;
}
.step h3 { font-size: 16px; }
.step p { color: var(--muted); font-size: 14px; margin-bottom: 0; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 14px; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #f1f5f9; font-weight: 600; }
tr:last-child td { border-bottom: none; }
.sample-note {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
  padding: 10px 14px;
}

/* ---------- 风险提示区 ---------- */
.risk-box {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: var(--radius);
  color: var(--warn-ink);
  padding: 20px 24px;
  margin: 10px 0;
}
.risk-box h3 { color: var(--warn-ink); font-size: 16px; }
.risk-box ul { margin: 0; padding-left: 20px; }
.risk-box li { margin-bottom: 4px; font-size: 14px; }

/* ---------- 定价 ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.price-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.price-card.hot { border-color: var(--brand-2); box-shadow: 0 12px 34px rgba(37, 99, 235, 0.15); }
.price-card .price { font-size: 34px; font-weight: 800; margin: 8px 0 4px; }
.price-card .price small { font-size: 15px; font-weight: 500; color: var(--muted); }
.price-card .price-note { color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.price-card ul { flex: 1; margin: 0 0 18px; padding-left: 18px; font-size: 14px; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; }
details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
summary { cursor: pointer; font-weight: 600; font-size: 15px; }
details p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

/* ---------- CTA 底栏 ---------- */
.cta-band { background: var(--surface); border-top: 1px solid var(--line); padding: 48px 0; text-align: center; }
.cta-band h2 { font-size: 26px; }
.cta-band p { color: var(--muted); max-width: 620px; margin: 0 auto 22px; }
.compliance-note { font-size: 12px; color: var(--muted); margin-top: 18px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0f172a; color: #cbd5e1; padding: 44px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; margin-bottom: 26px; }
.site-footer .logo { color: #fff; }
.site-footer h4 { color: #fff; font-size: 14px; margin-bottom: 10px; }
.site-footer a { display: block; color: #cbd5e1; font-size: 14px; margin-bottom: 6px; }
.footer-meta { border-top: 1px solid #1e293b; padding-top: 16px; font-size: 12px; color: #94a3b8; }

/* ---------- 法律页/正文 ---------- */
.page-main { padding: 52px 0 64px; }
.article { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 36px 40px; max-width: 860px; margin: 0 auto; }
.article h1 { font-size: 28px; }
.article h2 { font-size: 19px; margin-top: 28px; }
.article p, .article li { color: #334155; font-size: 15px; }
.article ul { padding-left: 20px; }

/* ---------- 内容卡片 ---------- */
.article-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.article-card .tag { font-size: 12px; color: var(--brand-2); font-weight: 600; }
.article-card-quant .tag { color: var(--quant-2); }
.article-card p { color: var(--muted); font-size: 14px; }

/* ---------- 联系表单 ---------- */
.form-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; max-width: 560px; }
.form-card label { display: block; font-size: 14px; font-weight: 600; margin: 14px 0 6px; }
.form-card input, .form-card textarea, .form-card select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
}
.form-card .btn { margin-top: 18px; border: none; cursor: pointer; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px 16px;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px 0; border-bottom: 1px solid #f1f5f9; }
  .site-nav .nav-cta { text-align: center; margin-top: 10px; }
  .hero h1 { font-size: 30px; }
  .hero { padding: 48px 0 44px; }
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .article { padding: 24px 20px; }
}

/* ---------- 手机端（≤480px）优化 ---------- */
@media (max-width: 480px) {
  .article { padding: 18px 14px; }
  .form-card { padding: 20px; }
  .form-card input, .form-card textarea, .form-card select {
    font-size: 16px;   /* 防止 iOS 聚焦自动缩放 */
    padding: 12px;
  }
  .form-card .btn { width: 100%; }
  .price-card .price { font-size: 28px; }
}

/* ===== 产品页内容块补充（2026-08-18，PPT V4.0 落地） ===== */
.badge { display:inline-block; padding:2px 10px; border-radius:999px; font-size:12px; background:#eef2ff; color:#4f46e5; margin-bottom:10px; font-weight:600; }
.badge-mvp { background:#ecfdf5; color:#047857; }
.stats-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(170px,1fr)); gap:16px; }
.stat { background:#fff; border:1px solid #e2e8f0; border-radius:14px; padding:20px 16px; text-align:center; }
.stat-num { font-size:24px; font-weight:700; color:#1e3a8a; line-height:1.3; }
.stat-label { font-size:13px; color:#64748b; margin-top:8px; }
.timeline { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:16px; }
.tl-item { border-left:3px solid #2563eb; background:#f8fafc; border-radius:0 12px 12px 0; padding:16px 18px; }
.tl-item h3 { margin:0 0 8px; font-size:16px; }
.tl-item p { margin:0; color:#475569; font-size:14px; }
.sub-head { margin-top:36px; }