:root {
  --side: #16324f;
  --side-2: #0f2439;
  --accent: #2b6cb0;
  --chip: #ebf3fb;
  --text: #1a202c;
  --wash: #f0f4f8;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  display: grid;
  grid-template-columns: 232px 1fr;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--wash);
  line-height: 1.7;
}

.side {
  background: linear-gradient(180deg, var(--side), var(--side-2));
  color: #dbe7f3;
  padding: 22px 16px 32px;
  min-height: 100vh;
  position: sticky;
  top: 0;
}
.side .brand {
  display: block;
  color: #fff;
  text-decoration: none;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}
.side .tag { font-size: 12px; opacity: 0.75; margin-bottom: 22px; }
.side nav a {
  display: block;
  color: #d5e4f2;
  text-decoration: none;
  padding: 10px 12px;
  border-left: 3px solid transparent;
  margin-bottom: 4px;
}
.side nav a.is-current {
  background: rgba(255,255,255,0.08);
  border-left-color: #63b3ed;
  color: #fff;
}

.main { min-width: 0; }
.topbar {
  background: #fff;
  border-bottom: 1px solid #d4dee8;
  padding: 14px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar span { font-size: 13px; color: #4a5568; }

.stage { padding: 24px 28px 48px; max-width: 980px; }
.hero-fn {
  background: #fff;
  border: 1px solid #d5e0ea;
  padding: 22px 24px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
}
.hero-fn h1 { font-size: 26px; margin: 0 0 10px; line-height: 1.35; }
.hero-fn p { margin: 0 0 8px; color: #2d3748; }

.btn-row { display: flex; flex-direction: column; gap: 8px; min-width: 220px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  padding: 10px 14px;
  font-size: 14px;
}
.btn-pri { background: var(--accent); color: #fff; }
.btn-dark { background: #1a365d; color: #fff; }
.btn-ghost { background: var(--chip); color: #1a365d; }

.fn-row {
  background: #fff;
  margin-top: 14px;
  border: 1px solid #d5e0ea;
  display: grid;
  grid-template-columns: 56px 1fr;
  padding: 16px 18px;
}
.fn-ico {
  width: 40px;
  height: 40px;
  background: var(--chip);
  display: grid;
  place-items: center;
}
.fn-row h2 { margin: 0 0 8px; font-size: 18px; color: #1a365d; }
.fn-row p { margin: 0 0 8px; }

.kv {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 8px;
}
.kv th, .kv td { border: 1px solid #d5e0ea; padding: 8px 10px; text-align: left; }
.kv th { background: #eef4fa; width: 28%; }

.faq-box { margin-top: 18px; background: #fff; border: 1px solid #d5e0ea; padding: 16px 20px; }
.faq-box h2 { font-size: 18px; color: #1a365d; }
.faq-box dt { font-weight: 700; margin-top: 14px; }
.faq-box dd { margin: 6px 0 0; }

.site-foot {
  margin: 24px 28px 32px;
  padding: 16px 18px;
  background: #1a365d;
  color: #d6e4f0;
  font-size: 12px;
}
.site-foot a { color: #90cdf4; }
.safe { color: #bee3f8; }

svg.icon { width: 16px; height: 16px; fill: currentColor; }

@media (max-width: 860px) {
  body { grid-template-columns: 1fr; }
  .side { position: relative; min-height: auto; }
  .hero-fn { grid-template-columns: 1fr; }
}