:root {
  --side: #111827;
  --blue: #1a56db;
  --blue-d: #1e429f;
  --bg: #f3f4f6;
  --card: #ffffff;
  --ink: #111827;
  --sub: #4b5563;
  --line: #e5e7eb;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15.5px;
  line-height: 1.7;
}

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

.shell {
  display: grid;
  grid-template-columns: 232px 1fr;
  min-height: 100vh;
}

aside.navpane {
  background: var(--side);
  color: #e5e7eb;
  padding: 28px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.brand em {
  display: block;
  font-style: normal;
  font-size: 12px;
  color: #9ca3af;
  font-weight: 400;
  margin-top: 6px;
}

aside.navpane nav a {
  display: block;
  color: #d1d5db;
  padding: 10px 10px;
  border-radius: 6px;
  margin-top: 6px;
}

aside.navpane nav a.current {
  background: var(--blue);
  color: #fff;
}

.content { padding: 28px 36px 48px; max-width: 980px; }

.hero {
  background: linear-gradient(135deg, #1a56db, #1e3a8a);
  color: #fff;
  border-radius: 14px;
  padding: 28px 26px;
  margin-bottom: 22px;
}

.hero h1 { font-size: 26px; line-height: 1.4; margin-bottom: 10px; }
.hero p { color: #dbeafe; }

.pick {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}

.pick span {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
}

.btn {
  display: inline-block;
  background: #fff;
  color: var(--blue-d);
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 700;
}

.btn:hover { text-decoration: none; background: #eff6ff; }

.btn-ghost {
  display: inline-block;
  margin-left: 8px;
  border: 1px solid #fff;
  color: #fff;
  padding: 9px 14px;
  border-radius: 8px;
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 16px;
}

.card h2 { font-size: 18px; margin-bottom: 8px; }

.full {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 18px;
  margin-bottom: 16px;
}

.full h2 { font-size: 19px; margin-bottom: 10px; }

table.sel {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.sel th, table.sel td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 9px 8px;
}

table.sel th { color: var(--blue-d); }

.faq .row { padding: 12px 0; border-bottom: 1px solid var(--line); }
.faq .row b { display: block; margin-bottom: 4px; }

footer.site {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--sub);
  line-height: 1.7;
}

footer.site .safe { color: var(--blue-d); }

@media (max-width: 840px) {
  .shell { grid-template-columns: 1fr; }
  aside.navpane { position: relative; height: auto; }
  .cards { grid-template-columns: 1fr; }
  .content { padding: 18px 14px 36px; }
}