:root {
  --sky: #0284c7;
  --ice: #f0f9ff;
  --ink: #0c4a6e;
  --line: #bae6fd;
  --deep: #0369a1;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font: 16px/1.7 "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--ice);
  color: var(--ink);
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background: var(--deep);
  color: #e0f2fe;
  position: sticky;
  top: 0;
  z-index: 5;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}
nav { display: flex; gap: 14px; flex-wrap: wrap; }
nav a {
  color: #e0f2fe;
  text-decoration: none;
  font-size: 13px;
}
nav a:hover { text-decoration: underline; }
.hero { padding: 36px 24px 20px; max-width: 960px; }
.hero h1 {
  font-size: 28px;
  line-height: 1.35;
  margin-bottom: 12px;
}
main > section {
  padding: 26px 24px;
  max-width: 1120px;
  margin: 0 auto;
}
h2 { font-size: 22px; margin-bottom: 10px; }
h3 { font-size: 16px; margin: 8px 0; }
.step7 {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-top: 16px;
  counter-reset: none;
}
.step7 li {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 5px solid var(--sky);
  padding: 10px 8px;
  min-height: 168px;
}
.step7 li:nth-child(odd) { background: #e0f2fe; }
.step7 li:hover { border-top-color: #0c4a6e; }
.step7 b {
  display: block;
  font-size: 20px;
  color: var(--sky);
}
.step7 strong {
  display: block;
  margin: 4px 0;
  font-size: 14px;
}
.step7 p { font-size: 13px; }
.ranks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 14px;
}
.card {
  background: #fff;
  padding: 16px;
  border: 1px solid var(--line);
}
.card svg { color: var(--sky); }
.r1 { border-top: 6px solid #0369a1; }
.r2 { border-top: 6px solid #0284c7; }
.r3 { border-top: 6px solid #7dd3fc; }
.cards3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 14px;
}
.card:hover { box-shadow: 0 6px 16px rgba(2, 132, 199, 0.12); }
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  margin-top: 12px;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--line);
  padding: 9px;
  vertical-align: top;
}
th { background: #e0f2fe; }
.skip-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}
.skip-list li {
  display: flex;
  gap: 12px;
  background: #fff;
  padding: 14px;
  border-left: 5px solid #38bdf8;
}
.skip-list svg { color: var(--sky); flex: 0 0 32px; }
.faq details {
  background: #fff;
  margin: 8px 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin-top: 8px; }
.faq details[open] { background: #e0f2fe; }
.site-footer {
  padding: 24px;
  background: var(--ink);
  color: #e0f2fe;
  font-size: 13px;
}
.site-footer p { margin: 6px 0; }
@media (max-width: 900px) {
  .step7,
  .ranks,
  .cards3 { grid-template-columns: 1fr; }
  .step7 li { min-height: 0; }
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .hero h1 { font-size: 22px; }
}