/* Set 1: 经典产品官网 — 顶栏居中、三栏卡片、浅底蓝强调 */
:root {
  --bg: #f4f7fb;
  --paper: #ffffff;
  --ink: #1c2430;
  --muted: #5b6778;
  --line: #d7e0ec;
  --brand: #1a73e8;
  --brand-ink: #0b4ea8;
  --ok: #188038;
  --warn: #e37400;
}
* { 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(--bg);
  line-height: 1.75;
  font-size: 16px;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .02em;
}
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--ink);
}
.nav a.is-current {
  background: #e8f1fd;
  color: var(--brand-ink);
  font-weight: 700;
}
.hero {
  padding: 64px 0 36px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 36px;
  align-items: center;
}
.kicker {
  display: inline-block;
  background: #e8f1fd;
  color: var(--brand-ink);
  font-size: 13px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 12px;
}
h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
  margin: 0 0 16px;
}
h2 {
  font-size: 26px;
  line-height: 1.35;
  margin: 0 0 14px;
}
h3 { font-size: 18px; margin: 0 0 8px; }
.lead { font-size: 18px; color: var(--muted); margin: 0 0 22px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
button {
  font: inherit;
  cursor: pointer;
  border: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 700;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #1558b0; }
.btn-ghost { background: #fff; color: var(--brand-ink); border: 1px solid #b7d0f5; }
.btn-ghost:hover { background: #eef5ff; }
.btn:disabled { opacity: .7; cursor: wait; }
.hero-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 10px 30px rgba(26,115,232,.08);
}
.hero-panel li { margin: 8px 0; color: var(--muted); }
section { padding: 28px 0; }
.block {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  margin: 18px 0;
}
.cols-3, .cols-2 {
  display: grid;
  gap: 16px;
}
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}
.icon-row { display: flex; align-items: flex-start; gap: 12px; }
.muted { color: var(--muted); }
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.stat {
  text-align: center;
  background: #0b4ea8;
  color: #fff;
  border-radius: 12px;
  padding: 18px 10px;
}
.stat b { display: block; font-size: 28px; }
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: #eef4fc; }
.faq-item { border-top: 1px solid var(--line); padding: 14px 0; }
.faq-item:first-child { border-top: 0; }
.faq-item strong { display: block; margin-bottom: 6px; }
.quote {
  background: #fff8ee;
  border-left: 4px solid var(--warn);
  padding: 14px 16px;
  margin: 0;
}
.site-footer {
  margin-top: 40px;
  background: #132033;
  color: #d5deea;
  padding: 36px 0;
}
.site-footer a { color: #9ec5ff; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr .8fr .8fr;
  gap: 24px;
}
.safety {
  background: #17324f;
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 900px) {
  .hero-grid, .cols-3, .cols-2, .stats, .foot-grid { grid-template-columns: 1fr; }
  .header-inner { flex-direction: column; align-items: flex-start; padding: 12px 0; }
}