:root {
  --ink: #111827;
  --muted: #5b6472;
  --line: #d8dee8;
  --soft: #f7f8fb;
  --panel: #ffffff;
  --brand: #dc2626;
  --brand-dark: #991b1b;
  --accent: #f59e0b;
  --green: #15803d;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.75;
  background: #ffffff;
}
a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
}
.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
}
.brand img { width: 40px; height: 40px; }
.nav-links, .footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 15px;
}
.hero {
  padding: 36px 0 30px;
  background: linear-gradient(180deg, #fff 0%, #fff7ed 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 32px;
  align-items: center;
}
.eyebrow {
  color: var(--green);
  font-weight: 800;
  font-size: 14px;
  margin: 0 0 12px;
}
h1, h2, h3 { line-height: 1.28; margin: 0 0 14px; letter-spacing: 0; }
h1 { font-size: clamp(34px, 5vw, 56px); }
h2 { font-size: clamp(24px, 3vw, 34px); padding-top: 10px; }
h3 { font-size: 20px; }
p { margin: 0 0 16px; }
.lead { color: #374151; font-size: 18px; }
.button-row, .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-weight: 800;
}
.button.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.banner {
  width: 100%;
  aspect-ratio: 1200 / 630;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: 0 18px 46px rgba(17, 24, 39, .16);
}
.section { padding: 42px 0; border-top: 1px solid #eef2f7; }
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 34px;
  align-items: start;
}
.article { min-width: 0; }
.notice, .toc, .link-card, .info-box, .media-card, .article-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.notice { padding: 16px; background: #fff7ed; border-color: #fed7aa; color: #7c2d12; }
.toc { position: sticky; top: 92px; padding: 18px; }
.toc strong { display: block; margin-bottom: 10px; }
.toc a { display: block; padding: 7px 0; color: #374151; }
.link-grid, .media-grid, .article-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.link-card, .article-card { padding: 16px; color: var(--ink); }
.link-card {
  min-height: 144px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.link-card img {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--line);
}
.link-card span, .article-card span { color: var(--muted); font-size: 14px; }
.media-card { overflow: hidden; background: var(--soft); }
.media-card img { width: 100%; display: block; aspect-ratio: 4 / 3; object-fit: cover; }
.media-card strong { display: block; padding: 12px 14px 4px; }
.media-card p { padding: 0 14px 14px; color: var(--muted); font-size: 14px; }
.plain-list, .steps { padding-left: 22px; }
.plain-list li, .steps li { margin: 8px 0; }
.info-box { padding: 20px; background: var(--soft); }
.video-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: 8px;
  background: #111827;
}
.compare { width: 100%; border-collapse: collapse; margin: 12px 0 20px; }
.compare th, .compare td { border: 1px solid var(--line); padding: 10px; text-align: left; }
.compare th { background: #f3f4f6; }
.qa details { border-top: 1px solid var(--line); padding: 14px 0; }
.qa summary { cursor: pointer; font-weight: 800; }
.page-title { padding: 44px 0 26px; background: #fff7ed; }
.legal { max-width: 860px; }
.site-footer { padding: 34px 0; color: #d1d5db; background: #111827; }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}
.footer-links a { color: #f9fafb; }
.small { color: var(--muted); font-size: 14px; }
@media (max-width: 900px) {
  .nav, .footer-grid { align-items: flex-start; flex-direction: column; }
  .hero-grid, .content-grid { grid-template-columns: 1fr; }
  .toc { position: static; }
  .link-grid, .media-grid, .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 540px) {
  .link-grid, .media-grid, .article-grid { grid-template-columns: 1fr; }
}