:root {
  color-scheme: light;
  --brand: #ffb020;
  --brand-soft: #fff8eb;
  --ink: #111827;
  --muted: #4b5563;
  --line: #e5e7eb;
  --paper: #ffffff;
  --page: #f5f7fb;
  --footer: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: #1f2430;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a {
  color: inherit;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav {
  max-width: 1040px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--brand);
  font-size: 22px;
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: auto;
  height: 38px;
}

.home-link {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.home-link:hover {
  color: var(--brand);
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 34px 18px 56px;
}

.hero-card,
.card {
  background: var(--paper);
  border: 1px solid rgba(17, 24, 39, 0.06);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.hero-card {
  padding: 26px 24px;
  margin-bottom: 16px;
}

.card {
  padding: 22px 24px;
  margin-bottom: 14px;
}

h1 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.35;
}

h2 {
  margin: 28px 0 10px;
  color: var(--ink);
  font-size: 21px;
  line-height: 1.4;
}

h2:first-child {
  margin-top: 0;
}

h3 {
  margin: 22px 0 8px;
  color: var(--ink);
  font-size: 17px;
}

p {
  margin: 9px 0;
}

ul {
  margin: 10px 0;
  padding-left: 22px;
}

li {
  margin: 5px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 14px;
}

th,
td {
  border: 1px solid #d8dee9;
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #fff4dc;
  color: var(--ink);
  font-weight: 700;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.tip {
  margin: 14px 0 0;
  padding: 12px 14px;
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  border-radius: 8px;
}

.related {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.related a {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #ffffff;
  color: #374151;
  text-decoration: none;
}

.related a:hover {
  border-color: var(--brand);
  color: var(--ink);
  background: var(--brand-soft);
}

.site-footer {
  background: var(--footer);
  color: #ffffff;
}

.footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 30px 18px;
  color: #9ca3af;
  font-size: 13px;
}

.footer-inner strong {
  color: #ffffff;
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-card,
  .card {
    padding: 20px 16px;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}