:root {
  --ink: #1c2333;
  --muted: #5b6578;
  --line: #d9e1ee;
  --paper: #f5f8fd;
  --card: #ffffff;
  --brand: #1e4fd8;
  --brand-dark: #1639a6;
  --ok: #0f7a4b;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
}
img, svg { max-width: 100%; vertical-align: middle; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  font-size: 20px;
}
.brand:hover { text-decoration: none; }
.nav { display: flex; gap: 8px; }
.nav a {
  padding: 8px 14px;
  border-radius: 6px;
  color: var(--ink);
  font-weight: 600;
}
.nav a.is-current {
  background: var(--brand);
  color: #fff;
}
.nav a:hover { text-decoration: none; background: #e8eefc; }
.nav a.is-current:hover { background: var(--brand-dark); }
.hero {
  background: linear-gradient(180deg, #eef3ff 0%, var(--paper) 100%);
  padding: 56px 0 36px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: start;
}
.kicker {
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 0 0 10px;
  font-size: 13px;
}
h1 {
  font-size: 36px;
  line-height: 1.25;
  margin: 0 0 16px;
}
.lead { font-size: 18px; color: var(--muted); margin: 0 0 24px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 6px;
  font-weight: 700;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.download-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(30, 79, 216, 0.08);
}
.download-card h2 { font-size: 20px; margin: 0 0 12px; }
.download-card ul { margin: 0 0 16px; padding-left: 18px; color: var(--muted); }
.section { padding: 48px 0; }
.section.alt { background: #fff; }
h2 { font-size: 26px; line-height: 1.3; margin: 0 0 16px; }
.prose p { margin: 0 0 14px; }
.grid-4, .grid-2, .grid-3 {
  display: grid;
  gap: 16px;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
}
.card h3 { margin: 10px 0 8px; font-size: 18px; }
.muted { color: var(--muted); }
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: #eef3ff; }
.news-list { display: grid; gap: 12px; }
.news-item {
  background: #fff;
  border-left: 4px solid var(--brand);
  padding: 14px 16px;
}
.news-item time { display: block; color: var(--muted); font-size: 13px; }
.news-item h3 { margin: 4px 0 6px; font-size: 18px; }
.faq { display: grid; gap: 12px; }
.faq article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
}
.faq h3 { margin: 0 0 8px; font-size: 17px; }
.site-footer {
  background: #121826;
  color: #d5dbe8;
  padding: 36px 0 24px;
  margin-top: 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 20px;
}
.site-footer a { color: #d5dbe8; }
.foot-note { font-size: 13px; color: #9aa6bd; margin: 8px 0 0; }
.legal { border-top: 1px solid #2a3348; padding-top: 16px; font-size: 13px; color: #9aa6bd; }
.icon { width: 28px; height: 28px; }
@media (max-width: 900px) {
  .hero-grid, .grid-4, .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 28px; }
  .header-inner { flex-wrap: wrap; padding: 10px 0; }
}