/* 第4套：步骤驱动 · 时间轴 · 森绿与奶油 */
:root {
  --cream: #fff8f0;
  --forest: #1e4d36;
  --leaf: #2d6a4f;
  --brick: #b23a2f;
  --ink: #1c211c;
  --muted: #4f5a52;
  --line: #d7cbb8;
  --card: #fffdf8;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.8;
  font-size: 16.5px;
}

.notice {
  background: var(--forest);
  color: #e9f6ee;
  text-align: center;
  padding: 9px 12px;
  font-size: 13px;
}
.page { width: min(760px, calc(100% - 32px)); margin: 0 auto; }

header.stephead {
  padding: 22px 0 8px;
}
.brand {
  font-size: 28px;
  font-weight: 800;
  color: var(--forest);
  text-decoration: none;
}
nav.steps-nav {
  display: flex;
  gap: 0;
  margin-top: 14px;
  border: 1px solid var(--line);
}
nav.steps-nav a {
  flex: 1;
  text-align: center;
  text-decoration: none;
  color: var(--forest);
  padding: 10px 6px;
  border-right: 1px solid var(--line);
  font-size: 14px;
}
nav.steps-nav a:last-child { border-right: none; }
nav.steps-nav a.current { background: var(--leaf); color: #fff; font-weight: 700; }

.hero { padding: 28px 0 8px; }
.hero h1 { font-size: 30px; line-height: 1.35; margin-bottom: 12px; }
.kicker { color: var(--leaf); font-weight: 700; font-size: 13px; letter-spacing: 0.12em; }
.hero .lead { color: var(--muted); margin: 10px 0 18px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brick);
  color: #fff;
  text-decoration: none;
  padding: 12px 20px;
  font-weight: 700;
}
.btn-plain { background: var(--forest); margin-left: 8px; }

.timeline {
  position: relative;
  margin: 36px 0 20px;
  padding-left: 36px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: #c9ddcf;
}
.t-item {
  position: relative;
  margin: 0 0 28px;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 18px 18px 18px 16px;
}
.t-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 20px;
  width: 14px;
  height: 14px;
  background: var(--leaf);
  border-radius: 50%;
  box-shadow: 0 0 0 4px #e5f3ea;
}
.num {
  font-size: 42px;
  font-weight: 800;
  color: #cfe0d4;
  line-height: 1;
  margin-bottom: 6px;
}
.t-item h2 { font-size: 21px; color: var(--forest); margin-bottom: 8px; }
.t-item p + p { margin-top: 10px; }
.t-item ol, .t-item ul { margin: 10px 0 0 1.2em; }

.block { margin: 28px 0; }
.block h2 { font-size: 22px; color: var(--forest); margin-bottom: 10px; }
.block p + p { margin-top: 10px; }

table.req {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  background: var(--card);
}
table.req th, table.req td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
table.req th { background: #e7f1ea; }

.faq article { border-bottom: 1px dashed var(--line); padding: 12px 0; }
.faq h2 { color: var(--forest); margin-bottom: 8px; }
.faq h3 { font-size: 16px; margin-bottom: 6px; }

footer {
  margin: 36px 0 50px;
  padding-top: 16px;
  border-top: 2px solid var(--forest);
  font-size: 13px;
  color: var(--muted);
}
footer p { margin: 8px 0; }
footer a { color: var(--brick); }

svg.icon { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; }

@media (max-width: 560px) {
  .timeline { padding-left: 24px; }
  nav.steps-nav { flex-direction: column; }
}