/* 第4套：步骤驱动 · 左侧序号轨 */
:root {
  --bg: #faf6f1;
  --ink: #252422;
  --orange: #e85d04;
  --orange-d: #bc4b03;
  --slate: #403d39;
  --card: #ffffff;
  --line: #d6cfc4;
}
* { box-sizing: border-box; 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;
  font-size: 16px;
}
a { color: var(--orange-d); }
.site-head {
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.site-head .bar {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  font-size: 22px;
  text-decoration: none;
}
.nav { display: flex; gap: 6px; }
.nav a {
  text-decoration: none;
  color: var(--slate);
  padding: 8px 14px;
  border-radius: 999px;
}
.nav a.active { background: var(--orange); color: #fff; }
.layout {
  width: min(1180px, calc(100% - 32px));
  margin: 28px auto 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 28px;
  align-items: start;
}
.hero-block {
  background: #252422;
  color: #fff;
  padding: 32px 32px 28px;
}
.hero-block h1 { font-size: 30px; line-height: 1.4; margin: 8px 0 14px; }
.hero-block p { color: #ddd5c8; }
.btn {
  display: inline-block;
  background: var(--orange);
  color: #fff;
  text-decoration: none;
  padding: 12px 18px;
  font-weight: 700;
  margin-right: 8px;
  margin-top: 8px;
}
.btn.ghost { background: transparent; border: 1px solid #fff; }
.rail { margin-top: 8px; }
.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 8px 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.no {
  width: 56px;
  height: 56px;
  border: 2px solid var(--orange);
  color: var(--orange);
  font-weight: 800;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
}
.step h2 { font-size: 22px; margin-bottom: 8px; }
.aside {
  position: sticky;
  top: 16px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 18px;
}
.aside h2 { font-size: 18px; margin-bottom: 10px; }
.aside a.btn { display: block; text-align: center; margin: 8px 0; }
.aside small { color: #6b6560; display: block; margin-top: 8px; }
.note {
  background: #fff;
  border-left: 5px solid var(--orange);
  padding: 16px 18px;
  margin: 18px 0;
}
.faq { margin-top: 20px; }
.faq-item { padding: 14px 0; border-bottom: 1px dashed var(--line); }
.faq-item h3 { font-size: 17px; margin-bottom: 6px; }
.site-foot {
  background: #252422;
  color: #cfc6b8;
  padding: 28px 0;
  font-size: 13px;
}
.site-foot .bar { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-foot a { color: #fff; }
.safe { color: #ffba08; margin-bottom: 8px; }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .aside { position: static; }
}