:root {
  --g: #0f766e;
  --g2: #115e59;
  --ink: #1c1917;
  --paper: #fafaf9;
  --card: #ffffff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
}

.top {
  background: var(--card);
  border-bottom: 1px solid #e7e5e4;
  position: sticky;
  top: 0;
  z-index: 5;
}
.top-in {
  width: min(1200px, calc(100% - 28px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}
.brand {
  color: var(--g2);
  text-decoration: none;
  font-weight: 800;
  font-size: 22px;
}
.nav a {
  color: #44403c;
  text-decoration: none;
  margin-left: 18px;
  font-size: 14px;
}
.nav a.is-current {
  color: var(--g);
  font-weight: 700;
  border-bottom: 2px solid var(--g);
}

.layout {
  width: min(1200px, calc(100% - 28px));
  margin: 20px auto 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 22px;
}

.hero-step {
  background: var(--card);
  border: 1px solid #e7e5e4;
  padding: 22px 24px;
}
.hero-step h1 { margin: 0 0 12px; font-size: 26px; line-height: 1.35; }
.progress {
  display: flex;
  gap: 8px;
  margin: 16px 0 8px;
  flex-wrap: wrap;
}
.progress span {
  background: #ccfbf1;
  color: var(--g2);
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 999px;
}

.step {
  background: var(--card);
  border: 1px solid #e7e5e4;
  margin-top: 14px;
  padding: 18px 20px 18px 72px;
  position: relative;
}
.step .num {
  position: absolute;
  left: 16px;
  top: 18px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--g);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
}
.step h2 { margin: 0 0 10px; font-size: 19px; }

.dock {
  position: sticky;
  top: 72px;
  background: var(--g2);
  color: #ecfdf5;
  padding: 16px;
}
.dock p { margin: 0 0 10px; font-size: 13px; }
.dock a {
  display: block;
  text-align: center;
  text-decoration: none;
  padding: 10px 8px;
  margin-bottom: 8px;
  background: #fff;
  color: var(--g2);
  font-size: 13px;
}
.dock a.win { background: #99f6e4; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  padding: 10px 14px;
  background: var(--g);
  color: #fff;
  margin-right: 8px;
  margin-top: 6px;
}
.btn-line { background: #fff; color: var(--g2); border: 1px solid var(--g); }

.faq { margin-top: 14px; background: #fff; border: 1px solid #e7e5e4; padding: 16px 20px; }
.faq h2 { font-size: 19px; }
.faq dt { font-weight: 700; margin-top: 12px; }
.faq dd { margin: 6px 0 0; }

.site-foot {
  background: #1c1917;
  color: #d6d3d1;
  font-size: 12px;
  padding: 24px 0 32px;
}
.foot-in { width: min(1200px, calc(100% - 28px)); margin: 0 auto; }
.site-foot a { color: #5eead4; }
.safe { color: #99f6e4; }

svg.icon { width: 15px; height: 15px; fill: currentColor; }

@media (max-width: 920px) {
  .layout { grid-template-columns: 1fr; }
  .dock { position: relative; top: 0; }
}