/* 第4套：步骤驱动 · 左侧时间轴 */
:root {
  --bg: #f4f6f8;
  --ink: #1f2937;
  --blue: #2563eb;
  --blue-d: #1d4ed8;
  --line: #d5dde7;
  --card: #ffffff;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
}
a { color: var(--blue); }
.top {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.top-inner, .page { width: min(1100px, calc(100% - 32px)); margin: 0 auto; }
.top-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--blue); font-weight: 800; font-size: 20px; }
.nav a { margin-left: 18px; text-decoration: none; color: #4b5563; }
.nav a.current { color: var(--blue); font-weight: 700; }
.hero {
  background: linear-gradient(90deg, #2563eb 0%, #60a5fa 100%);
  color: #fff;
  padding: 40px 0;
}
.hero h1 { margin: 0 0 12px; font-size: 30px; }
.hero .lead { color: #e8f1ff; }
.chips span {
  display: inline-block;
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.35);
  padding: 3px 10px;
  margin: 8px 8px 0 0;
  border-radius: 999px;
  font-size: 13px;
}
.cta-row { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }
.btn { background: #fff; color: var(--blue-d); text-decoration: none; padding: 11px 18px; border-radius: 6px; font-weight: 700; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid #fff; }
.timeline { padding: 36px 0 56px; }
.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 18px;
  margin: 0 0 22px;
}
.num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  padding: 16px 18px;
}
.card h2 { margin: 0 0 8px; font-size: 20px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.pills span { background: #dbeafe; color: #1e3a8a; padding: 4px 10px; border-radius: 999px; font-size: 13px; }
table.req { width: 100%; border-collapse: collapse; background: #fff; }
table.req th, table.req td { border: 1px solid var(--line); padding: 10px; }
table.req th { background: #dbeafe; }
.faq details { background: #fff; border: 1px solid var(--line); padding: 12px 14px; margin: 0 0 10px; }
.faq summary { font-weight: 700; cursor: default; }
.site-footer { background: #111827; color: #d1d5db; padding: 24px 0; font-size: 13px; }
@media (max-width: 720px) {
  .top-inner { flex-direction: column; align-items: flex-start; }
  .nav a { margin: 0 12px 0 0; }
  .step { grid-template-columns: 1fr; }
}