/* =========================================================
   yusy.com — SEO 专题指南与赛道详情页
   Loads after style.css.
   ========================================================= */

.guide-hero {
  padding: 72px 0 54px;
  color: #fff;
  background:
    linear-gradient(118deg, rgba(7, 20, 43, .96), rgba(11, 42, 107, .88)),
    #0b2a6b;
}
.guide-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 20px;
  color: rgba(255, 255, 255, .72);
  font-size: 13px;
}
.guide-hero .breadcrumb a { color: #fff; }
.guide-hero .eyebrow {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 5px 10px;
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  color: #d8e7ff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}
.guide-hero h1 {
  max-width: 900px;
  margin: 0 0 18px;
  font-size: clamp(34px, 5.5vw, 58px);
  line-height: 1.12;
  letter-spacing: -.025em;
}
.guide-hero .lead {
  max-width: 820px;
  margin: 0;
  color: rgba(255, 255, 255, .82);
  font-size: clamp(16px, 2.3vw, 20px);
  line-height: 1.75;
}
.guide-hero .meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 24px;
  color: rgba(255, 255, 255, .72);
  font-size: 13px;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 44px;
  align-items: start;
}
.guide-content { min-width: 0; }
.guide-content > section { scroll-margin-top: 88px; }
.guide-content h2 {
  margin: 0 0 16px;
  color: var(--c-ink);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.25;
}
.guide-content h3 {
  margin: 26px 0 10px;
  color: var(--c-ink);
  font-size: 21px;
  line-height: 1.35;
}
.guide-content p,
.guide-content li {
  color: var(--c-ink-2);
  font-size: 16px;
  line-height: 1.85;
}
.guide-content ul,
.guide-content ol { padding-left: 22px; }
.guide-content section + section {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--c-line);
}
.guide-aside {
  position: sticky;
  top: 92px;
  padding: 18px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.guide-aside h2 {
  margin: 0 0 10px;
  font-size: 15px;
}
.guide-aside a {
  display: block;
  padding: 8px 0;
  border-top: 1px solid var(--c-line);
  color: var(--c-ink-2);
  font-size: 13.5px;
}
.guide-aside a:hover { color: var(--c-brand); }

.guide-summary,
.guide-note {
  margin: 24px 0;
  padding: 18px 20px;
  border: 1px solid #cfe0fb;
  border-left: 4px solid var(--c-brand-2);
  border-radius: 8px;
  background: #f4f8ff;
}
.guide-note.warn {
  border-color: #f0dfb0;
  border-left-color: #d39700;
  background: #fffaf0;
}
.guide-summary p,
.guide-note p { margin: 0; }

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.guide-card {
  display: block;
  padding: 20px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.guide-card:hover {
  transform: translateY(-2px);
  border-color: #a9c6f2;
  box-shadow: var(--shadow-md);
}
.guide-card .code {
  display: inline-block;
  margin-bottom: 9px;
  color: var(--c-brand-2);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
}
.guide-card h2,
.guide-card h3 {
  margin: 0 0 8px;
  color: var(--c-ink);
  font-size: 20px;
}
.guide-card p {
  margin: 0;
  color: var(--c-ink-2);
  font-size: 14px;
  line-height: 1.7;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}
.fact {
  padding: 16px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  background: var(--c-bg-soft);
}
.fact .k {
  display: block;
  margin-bottom: 5px;
  color: var(--c-mute);
  font-size: 12px;
  font-weight: 700;
}
.fact .v {
  color: var(--c-ink);
  font-size: 16px;
  font-weight: 800;
}

.guide-table {
  width: 100%;
  margin: 20px 0;
  border-collapse: collapse;
  border: 1px solid var(--c-line);
  font-size: 14.5px;
}
.guide-table th,
.guide-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
}
.guide-table th {
  background: var(--c-bg-sky);
  color: var(--c-ink);
}

.guide-faq details {
  border-top: 1px solid var(--c-line);
  background: #fff;
}
.guide-faq details:last-child { border-bottom: 1px solid var(--c-line); }
.guide-faq summary {
  padding: 17px 4px;
  color: var(--c-ink);
  font-weight: 750;
  cursor: pointer;
}
.guide-faq .answer {
  padding: 0 4px 18px;
  color: var(--c-ink-2);
  font-size: 15px;
  line-height: 1.8;
}

.related-pages {
  margin-top: 54px;
  padding: 30px;
  border-radius: 8px;
  background: var(--c-bg-sky);
}
.related-pages h2 { margin-bottom: 18px; }
.updated-line {
  margin-top: 16px;
  color: var(--c-mute);
  font-size: 12.5px;
}
.foot-legal { display: inline-flex; gap: 12px; }
.foot-legal a { color: inherit; }

.registration-closed {
  margin: 0 0 24px;
  padding: 16px 18px;
  border: 1px solid #f0dfb0;
  border-left: 4px solid #d39700;
  border-radius: 8px;
  background: #fffaf0;
  color: #674b00;
  line-height: 1.7;
}

.error-shell {
  min-height: 70vh;
  display: grid;
  place-items: center;
  padding: 72px 20px;
  text-align: center;
}
.error-code {
  color: var(--c-brand-2);
  font-size: clamp(72px, 18vw, 150px);
  font-weight: 900;
  line-height: .9;
}
.error-shell h1 { margin: 20px 0 12px; }
.error-shell p { max-width: 620px; color: var(--c-ink-2); line-height: 1.75; }
.error-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 24px; }

@media (max-width: 900px) {
  .guide-layout { grid-template-columns: 1fr; }
  .guide-aside { position: static; order: -1; }
  .guide-aside nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 14px; }
}
@media (max-width: 680px) {
  .guide-hero { padding: 54px 0 42px; }
  .guide-grid,
  .fact-grid { grid-template-columns: 1fr; }
  .guide-aside nav { grid-template-columns: 1fr; }
  .related-pages { padding: 22px 18px; }
  .guide-table { display: block; overflow-x: auto; }
}