* { box-sizing: border-box; }
:root {
  --black: #0f0f0f;
  --white: #fafaf8;
  --off: #f2f1ed;
  --gray: #77756e;
  --border: rgba(15,15,15,0.12);
}
body {
  margin: 0;
  color: var(--black);
  background: var(--white);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.75;
}
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 48px;
  border-bottom: 1px solid var(--border);
}
nav a { color: var(--gray); text-decoration: none; font-size: 12px; letter-spacing: .08em; }
nav a:hover, nav a.active { color: var(--black); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.article-wrap { max-width: 820px; margin: 0 auto; padding: 64px 24px 88px; }
.eyebrow { color: var(--gray); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
h1, h2 { font-family: 'Inter', sans-serif; font-weight: 300; line-height: 1.2; }
h1 { max-width: 760px; margin: 14px 0 18px; font-size: 52px; }
.lede { max-width: 720px; margin: 0 0 44px; color: #555; font-size: 17px; }
.article-meta { margin-bottom: 44px; color: var(--gray); font-size: 12px; letter-spacing: .05em; }
article { max-width: 700px; }
article section { padding-top: 30px; margin-top: 38px; border-top: 1px solid var(--border); }
h2 { margin: 0 0 14px; font-size: 32px; }
p { margin: 0 0 16px; color: #3d3d3a; }
ul { margin: 12px 0 20px 20px; padding: 0; color: #3d3d3a; }
li { margin-bottom: 8px; }
.note { margin: 22px 0; padding: 18px 20px; border-left: 3px solid var(--black); background: var(--off); color: #333; }
.product-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 22px; }
.product-links a { padding: 12px 14px; color: var(--black); text-decoration: none; border: 1px solid var(--border); }
.product-links a:hover { background: var(--off); }
.cta { margin-top: 50px; padding: 32px 28px; color: var(--white); background: var(--black); text-align: center; }
.cta a { margin-top: 6px; }
.cta h2, .cta p { color: var(--white); }
.cta p { opacity: .75; }
.cta a { display: inline-block; padding: 12px 22px; color: var(--black); background: var(--white); text-decoration: none; font-size: 12px; letter-spacing: .08em; }
@media (max-width: 700px) {
  nav { padding: 0 20px; }
  .nav-links { gap: 12px; }
  .nav-links a:nth-child(2), .nav-links a:nth-child(4) { display: none; }
  .article-wrap { padding: 84px 20px 64px; }
  h1 { font-size: 38px; }
  .lede { font-size: 16px; }
  .product-links { grid-template-columns: 1fr; }
  .tier-table { display: block; }
  .tier-table thead { display: none; }
  .tier-table tr { display: block; margin-bottom: 14px; border: 1px solid var(--border); }
  .tier-table td { display: block; border: none; padding: 10px 12px; }
  .tier-table td:first-child { font-weight: 600; background: var(--off); }
  .related { grid-template-columns: 1fr; }
}

/* ── 新版式组件 ── */
.breadcrumb {
  font-size: 12px; letter-spacing: .04em; color: var(--gray);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--gray); text-decoration: none; }
.breadcrumb a:hover { color: var(--black); }
.breadcrumb span { color: var(--gray-light, #aaa); margin: 0 6px; }
.quick-answer {
  margin: 0 0 40px; padding: 22px 24px;
  background: var(--off); border: 1px solid var(--border);
}
.quick-answer .qa-label {
  display: block; font-size: 11px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--gray); margin-bottom: 10px;
}
.quick-answer p { margin: 0 0 10px; color: #333; }
.quick-answer p:last-child { margin-bottom: 0; }
.quick-answer strong { color: var(--black); }
article .table-wrap { overflow-x: auto; margin: 18px 0 24px; }
article table.tier-table {
  width: 100%; border-collapse: collapse; min-width: 560px;
  font-size: 14px; line-height: 1.55;
}
article .tier-table th, article .tier-table td {
  text-align: left; vertical-align: top;
  border: 1px solid var(--border); padding: 12px 14px; color: #3d3d3a;
}
article .tier-table th { background: var(--black); color: var(--white); font-weight: 500; }
article .tier-table tr:nth-child(even) td { background: var(--off); }
.faq-section h2 { margin-top: 8px; }
.faq-item { padding: 20px 0; border-top: 1px solid var(--border); }
.faq-item:last-child { border-bottom: 1px solid var(--border); }
.faq-item h3 { font-family: 'Inter', sans-serif; font-weight: 400; font-size: 20px; margin: 0 0 8px; }
.faq-item p { margin: 0; color: #3d3d3a; }
.related {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px; margin: 34px 0 8px;
}
.related a {
  display: block; padding: 16px; border: 1px solid var(--border);
  min-width: 0;
  color: var(--black); text-decoration: none; background: rgba(255,255,255,.4);
}
.related a:hover { background: var(--off); }
.related .r-cat { display: block; font-size: 10px; letter-spacing: .14em; color: var(--gray); text-transform: uppercase; margin-bottom: 6px; }
.related .r-title { font-family: 'Inter', sans-serif; font-size: 17px; line-height: 1.3; overflow-wrap: anywhere; }
@media (max-width: 700px) {
  .breadcrumb { margin-bottom: 14px; }
  .quick-answer { padding: 18px 16px; margin-bottom: 32px; }
}