/* 凭牌 Tessera — 站点样式
   单文件、无框架依赖。主色取自应用图标 #2B3A8F。 */

:root {
  --brand: #2b3a8f;
  --brand-700: #22306f;
  --brand-500: #3b4fb0;
  --brand-050: #eef1fb;
  --bg: #ffffff;
  --bg-soft: #f6f7fc;
  --text: #14161f;
  --muted: #5a6072;
  --border: #e4e7f0;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(20, 22, 31, .04), 0 8px 24px rgba(20, 22, 31, .06);
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 62px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: .2px;
}

.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.brand small { display: block; font-weight: 500; font-size: 11px; color: var(--muted); letter-spacing: .6px; }

.site-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }

.site-nav a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14.5px;
  font-weight: 500;
}

.site-nav a:hover { color: var(--brand); background: var(--brand-050); text-decoration: none; }

.site-nav a.cta {
  color: #fff;
  background: var(--brand);
  margin-left: 6px;
}

.site-nav a.cta:hover { background: var(--brand-700); color: #fff; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(158deg, #1b2559 0%, var(--brand) 48%, var(--brand-500) 100%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(255, 255, 255, .16), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(255, 255, 255, .1), transparent 38%);
  pointer-events: none;
}

.hero .wrap { position: relative; z-index: 1; padding: 74px 20px 78px; text-align: center; }

.hero-logo {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, .3);
  background: #fff;
}

.hero h1 {
  margin: 22px 0 10px;
  font-size: clamp(29px, 5vw, 44px);
  line-height: 1.22;
  letter-spacing: -.4px;
}

.hero h1 span { opacity: .72; font-weight: 500; }

.hero p.lead {
  margin: 0 auto;
  max-width: 640px;
  font-size: clamp(15px, 2.2vw, 18px);
  color: rgba(255, 255, 255, .86);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .12s ease, background .15s ease;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: #fff; color: var(--brand); }
.btn-primary:hover { background: #f0f2fb; }
.btn-ghost { border-color: rgba(255, 255, 255, .42); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .12); }

.tagline-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 26px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .78);
}

.tagline-badges span {
  padding: 4px 12px;
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: 999px;
}

/* ---------- 通用区块 ---------- */

section { padding: 62px 0; }
section.alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head { max-width: 700px; margin-bottom: 34px; }
.section-head h2 { margin: 0 0 8px; font-size: clamp(23px, 3.4vw, 30px); letter-spacing: -.3px; }
.section-head p { margin: 0; color: var(--muted); }

/* ---------- 功能卡片 ---------- */

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(268px, 1fr)); }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.card h3 { display: flex; align-items: center; gap: 9px; margin: 0 0 8px; font-size: 16.5px; }

.card h3 svg { flex: none; width: 20px; height: 20px; color: var(--brand); }
.card p { margin: 0; color: var(--muted); font-size: 14.6px; }

/* ---------- 表格 ---------- */

.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }

table { width: 100%; border-collapse: collapse; font-size: 14.6px; min-width: 560px; }
th, td { padding: 13px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
th { background: var(--bg-soft); font-weight: 600; font-size: 13.5px; color: var(--muted); white-space: nowrap; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: none; }
td code, p code, li code {
  font-family: var(--mono);
  font-size: .9em;
  background: var(--brand-050);
  color: var(--brand-700);
  padding: 1px 6px;
  border-radius: 5px;
}

/* ---------- 列表 ---------- */

.check-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }

.check-list li { position: relative; padding-left: 30px; color: var(--muted); font-size: 15px; }

.check-list li strong { color: var(--text); }

.check-list li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--brand-050);
  box-shadow: inset 0 0 0 3px var(--brand);
}

/* ---------- FAQ ---------- */

details.faq {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 14px 18px;
  margin-bottom: 10px;
}

details.faq summary { cursor: pointer; font-weight: 600; font-size: 15.2px; }
details.faq summary::marker { color: var(--brand); }
details.faq p { margin: 10px 0 0; color: var(--muted); font-size: 14.8px; }

/* ---------- 页脚 ---------- */

.site-footer { background: #10131f; color: #a9afc4; padding: 44px 0 30px; font-size: 14px; }
.site-footer a { color: #d5d9e6; }
.site-footer a:hover { color: #fff; }
.footer-top { display: flex; flex-wrap: wrap; gap: 28px; align-items: flex-start; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 600; }
.footer-brand img { width: 30px; height: 30px; border-radius: 8px; }
.footer-links { margin-left: auto; display: flex; flex-wrap: wrap; gap: 10px 22px; }
.footer-note { margin-top: 26px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .1); font-size: 12.8px; line-height: 1.75; color: #7f869c; }

/* ---------- 文档页（隐私政策 / 服务条款） ---------- */

.doc-hero { background: var(--bg-soft); border-bottom: 1px solid var(--border); padding: 44px 0 34px; }
.doc-hero h1 { margin: 0 0 6px; font-size: clamp(24px, 4vw, 34px); letter-spacing: -.3px; }
.doc-hero p { margin: 0; color: var(--muted); font-size: 14.5px; }

.doc { padding: 40px 0 64px; }
.doc-inner { max-width: 780px; }
.doc h2 {
  margin: 40px 0 10px;
  font-size: 19.5px;
  letter-spacing: -.2px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.doc h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.doc h3 { margin: 22px 0 6px; font-size: 16px; }
.doc p, .doc li { color: #33384a; font-size: 15.2px; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin-bottom: 7px; }
.doc .toc {
  background: var(--brand-050);
  border: 1px solid #dde2f5;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 34px;
}
.doc .toc strong { display: block; margin-bottom: 8px; font-size: 14px; color: var(--brand-700); }
.doc .toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 26px; }
@media (max-width: 640px) { .doc .toc ol { columns: 1; } }
.doc .toc li { margin-bottom: 3px; font-size: 14.2px; }
.note {
  background: #fff8e6;
  border: 1px solid #f2dfb0;
  border-left: 4px solid #d9a521;
  border-radius: 8px;
  padding: 14px 18px;
  margin: 18px 0;
}
.note p { margin: 0; font-size: 14.6px; }

/* ---------- 响应式 ---------- */

@media (max-width: 720px) {
  .site-nav a:not(.cta) { display: none; }
  .hero .wrap { padding: 54px 20px 58px; }
  section { padding: 48px 0; }
  .footer-links { margin-left: 0; }
}