/* 第4套 cn · 卡片栅格 · 先平台后功能 */
:root {
  --coral: #e24b3b;
  --steel: #2a3d55;
  --bg: #f3f5f8;
  --card: #fff;
  --line: #d8e0e8;
  --ink: #243040;
  --muted: #667484;
  --sans: "PingFang SC", "Microsoft YaHei", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.78;
}
a { color: var(--coral); }
.bar {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.bar__in {
  width: min(1120px, calc(100% - 24px));
  margin: 0 auto;
  min-height: 66px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--steel); font-weight: 800; font-size: 19px;
}
.brand svg { width: 28px; height: 28px; color: var(--coral); }
.nav { display: flex; gap: 6px; align-items: center; }
.nav a {
  text-decoration: none; color: var(--steel);
  padding: 7px 11px; border-radius: 999px;
  display: inline-flex; align-items: center; gap: 6px;
}
.nav a svg { width: 14px; height: 14px; }
.nav a:hover { background: #eceff3; }
.nav a[aria-current="page"] { background: var(--coral); color: #fff; }
.nav .top-dl { background: var(--coral); color: #fff; font-weight: 700; }
.page { width: min(1120px, calc(100% - 24px)); margin: 22px auto 36px; }
.kicker { color: var(--coral); font-size: 12px; font-weight: 700; margin: 0 0 8px; }
h1 { font-size: 30px; line-height: 1.32; margin: 0 0 12px; color: var(--steel); }
h2 { font-size: 22px; margin: 0 0 12px; color: var(--steel); }
h3 { font-size: 17px; margin: 12px 0 6px; }
p { margin: 0 0 12px; }
.intro { background: #fff; border-radius: 16px; padding: 22px 22px 10px; margin-bottom: 16px; border: 1px solid var(--line); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.tile {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 16px 8px;
  box-shadow: 0 8px 20px rgba(42, 61, 85, 0.05);
}
.tile svg { width: 26px; height: 26px; color: var(--coral); margin-bottom: 6px; }
.choice { background: #fff; border-radius: 16px; padding: 16px; border: 1px solid var(--line); }
.choice--on { outline: 2px solid var(--coral); }
.quote-bar { background: #fff; border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; }
.faq details { background: #fff; border-radius: 12px; padding: 4px 14px; margin-bottom: 8px; border: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; padding: 10px 0; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.btn, .btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 44px; padding: 0 16px; border-radius: 999px;
  text-decoration: none; font-weight: 700;
  transition: background 0.15s ease;
}
.btn { background: var(--coral); color: #fff; }
.btn:hover { background: #c43d30; }
.btn-ghost { background: #fff; color: var(--steel); border: 1px solid var(--steel); }
.btn-ghost:hover { background: #eceff3; }
.btn svg, .btn-ghost svg { width: 16px; height: 16px; }
.foot { background: var(--steel); color: #d5dde6; padding: 24px 0 32px; }
.foot__in { width: min(1120px, calc(100% - 24px)); margin: 0 auto; font-size: 14px; }
.foot p { color: #d5dde6; }
@media (max-width: 860px) {
  .grid-2, .grid-4 { grid-template-columns: 1fr; }
  h1 { font-size: 24px; }
}