/* cn 步骤驱动：左侧序号轴 + 茶色纸，非蓝表也非深色三列 */
body {
  margin: 0;
  background: #f7f1e3;
  color: #2c1810;
  font-family: "Palatino Linotype", "STKaiti", "KaiTi", "Microsoft YaHei", serif;
  font-size: 17px;
  line-height: 1.75;
}
.headband {
  background: #0a5c5c;
  color: #f7f1e3;
  padding: 20px 20px 0;
}
.headband .box { max-width: 920px; margin: 0 auto; }
.sign {
  font-size: 26px;
  letter-spacing: 0.22em;
  color: #f7f1e3;
  text-decoration: none;
  font-weight: 700;
}
.links { margin-top: 14px; display: flex; gap: 0; }
.links a {
  color: #d5ecec;
  text-decoration: none;
  padding: 10px 16px;
  font-size: 14px;
  font-family: "Microsoft YaHei", sans-serif;
}
.links a.here { background: #f7f1e3; color: #0a5c5c; }

.intro {
  max-width: 920px;
  margin: 0 auto;
  padding: 28px 20px 10px;
}
.intro h1 { font-size: 28px; margin: 0 0 12px; }
.flags { display: flex; gap: 18px; color: #0a5c5c; font-size: 14px; margin: 12px 0 16px; }
.dlset { display: flex; flex-direction: column; max-width: 360px; gap: 8px; }
.lnk {
  display: block;
  text-align: center;
  text-decoration: none;
  padding: 10px 12px;
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 14px;
}
.lnk1 { background: #0a5c5c; color: #f7f1e3; }
.lnk2 { background: #2c1810; color: #f7f1e3; }
.lnk3 { background: transparent; color: #0a5c5c; border: 1px solid #0a5c5c; }
.lnk4 { background: #e4d3b4; color: #2c1810; }

.primer {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px 8px;
}
.primer .card { margin-bottom: 12px; }

.axis { max-width: 920px; margin: 0 auto; padding: 10px 20px 36px; }
.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  margin: 0 0 8px;
}
.num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #0a5c5c;
  color: #f7f1e3;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Microsoft YaHei", sans-serif;
  position: relative;
}
.num:after {
  content: "";
  position: absolute;
  top: 56px;
  left: 27px;
  width: 2px;
  height: calc(100% + 28px);
  background: #b9a888;
}
.step:last-child .num:after { display: none; }
.card {
  background: #fffaf1;
  border: 1px solid #e0d2b6;
  padding: 14px 16px 8px;
}
.card h2 { margin: 0 0 8px; font-size: 20px; color: #0a5c5c; }
.qblock { background: #fffaf1; border-top: 2px solid #0a5c5c; padding: 12px 14px; margin: 0 0 12px; }
.qblock h3 { margin: 0 0 6px; font-size: 16px; }
.qblock p { margin: 0; color: #5a4034; }

.tail {
  background: #2c1810;
  color: #e8dcc8;
  font-size: 13px;
  font-family: "Microsoft YaHei", sans-serif;
  padding: 22px 20px 30px;
}
.tail .box { max-width: 920px; margin: 0 auto; }
.tail a { color: #b7e0e0; margin-right: 12px; }
.tail .safe { color: #f3e2b8; }

@media (max-width: 640px) {
  .step { grid-template-columns: 1fr; }
  .num:after { display: none; }
}