:root {
  --blue: #1677ff;
  --blue-d: #0958d9;
  --bg: #e8f4fc;
  --card: #ffffff;
  --text: #1f2933;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.8;
}
a { color: var(--blue-d); }

.bar {
  background: #fff;
  box-shadow: 0 1px 0 #cfe6f7;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--blue-d);
  font-weight: 700;
  font-size: 20px;
}
.nav a {
  text-decoration: none;
  color: #4b5563;
  margin-left: 18px;
  padding: 6px 0;
}
.nav a.is-current {
  color: var(--blue);
  box-shadow: inset 0 -2px 0 var(--blue);
}

.layout {
  max-width: 1080px;
  margin: 24px auto 48px;
  display: grid;
  grid-template-columns: minmax(0, 720px) 240px;
  gap: 24px;
  padding: 0 16px;
}

.hero {
  background: var(--card);
  border-radius: 8px;
  padding: 28px 28px 24px;
  margin-bottom: 20px;
  border: 1px solid #cfe3f3;
}
.hero h1 { font-size: 28px; line-height: 1.4; margin-bottom: 14px; }
.btn-dl {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 700;
}
.btn-dl:hover { background: var(--blue-d); color: #fff; }

.step {
  background: var(--card);
  border-radius: 8px;
  padding: 22px 24px;
  margin-bottom: 16px;
  border: 1px solid #d7e8f5;
}
.step h2 {
  font-size: 20px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step p { margin-bottom: 10px; }
.toc {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  border: 1px solid #cfe3f3;
  position: sticky;
  top: 76px;
  font-size: 14px;
}
.toc strong { display: block; margin-bottom: 10px; color: var(--blue-d); }
.toc a { display: block; text-decoration: none; padding: 6px 0; color: #334155; }
.faq-item { margin-bottom: 14px; }
.faq-item h3 { font-size: 17px; margin-bottom: 6px; }

.site-footer {
  background: #0f2744;
  color: #c5d4e4;
  padding: 28px 20px 36px;
  font-size: 13px;
  line-height: 1.7;
}
.site-footer .box { max-width: 1080px; margin: 0 auto; }
.foot-nav a { color: #9ec5ff; margin-right: 14px; text-decoration: none; }
.site-footer p { margin: 8px 0; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .toc { position: static; }
}