.topic-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px 72px;
}

/* 面包屑 */
.topic-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--fg-faint);
  margin: 4px 0 18px;
}
.topic-crumb a { color: var(--fg-muted); text-decoration: none; }
.topic-crumb a:hover { color: var(--accent); }
.topic-crumb .sep { color: var(--line-strong); }
.topic-crumb b { color: var(--fg); font-weight: var(--fw-medium); }

/* Hero */
.topic-hero { margin-bottom: 22px; }
.topic-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fg-faint);
  margin-bottom: 8px;
}
.topic-h1 {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-bold);
  color: var(--fg-strong);
  line-height: 1.15;
  margin: 0 0 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}
.topic-h1-en {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: var(--fw-regular);
  color: var(--fg-faint);
  letter-spacing: 0.01em;
}
.topic-intro {
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
  color: var(--fg-muted);
  max-width: 760px;
  margin: 0;
}

/* 关键数据 chips(rocket-list) */
.topic-chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 16px; }
.topic-chip {
  font-size: 13px;
  color: var(--fg-muted);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 12px;
}
.topic-chip b { color: var(--fg-strong); font-weight: var(--fw-semibold); }

/* 火箭卡网格:无侧栏,桌面双列 */
.topic-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 880px) { .topic-grid { grid-template-columns: 1fr 1fr; } }

.topic-empty { color: var(--fg-faint); padding: 40px 0; text-align: center; }

/* 统计页 */
.topic-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 20px 0;
}
@media (min-width: 720px) { .topic-stats-grid { grid-template-columns: repeat(4, 1fr); } }
.topic-stat {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.topic-stat b {
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  font-weight: var(--fw-bold);
  color: var(--fg-strong);
  line-height: 1;
}
.topic-stat span { font-size: 13px; color: var(--fg-faint); }

.topic-ranking { margin: 28px 0; }
.topic-ranking h2 {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--fg-strong);
  margin: 0 0 14px;
}
.topic-rank-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.topic-rank-row {
  display: grid;
  grid-template-columns: 28px minmax(120px, 1.4fr) 3fr auto;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-elev);
  text-decoration: none;
}
.topic-rank-row.is-link:hover { border-color: var(--accent); }
.topic-rank-row .rk-no { font-family: var(--font-mono); font-size: 13px; color: var(--fg-faint); }
.topic-rank-row .rk-name { font-size: 14px; color: var(--fg); font-weight: var(--fw-medium); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topic-rank-row .rk-bar { height: 8px; background: var(--bg-inset); border-radius: 999px; overflow: hidden; }
.topic-rank-row .rk-bar i { display: block; height: 100%; background: var(--accent); border-radius: 999px; }
.topic-rank-row .rk-count { font-family: var(--font-mono); font-size: 14px; color: var(--fg-strong); font-weight: var(--fw-semibold); text-align: right; }

/* 相关专题 */
.topic-related { margin-top: 40px; border-top: 1px solid var(--line-faint); padding-top: 24px; }
.topic-related h2 { font-size: var(--fs-lg); font-weight: var(--fw-semibold); color: var(--fg-strong); margin: 0 0 14px; }
.topic-related-grid { display: grid; grid-template-columns: 1fr; gap: 10px; }
@media (min-width: 720px) { .topic-related-grid { grid-template-columns: repeat(3, 1fr); } }
.topic-related-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-elev);
  text-decoration: none;
}
.topic-related-card:hover { border-color: var(--accent); }
.trc-title { font-size: 15px; font-weight: var(--fw-semibold); color: var(--fg-strong); }
.trc-blurb { font-size: 13px; color: var(--fg-muted); line-height: 1.4; }
.trc-count { font-family: var(--font-mono); font-size: 12px; color: var(--fg-faint); }

/* /topics 索引页 */
.topic-index-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 720px) { .topic-index-grid { grid-template-columns: 1fr 1fr; } }
.topic-index-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg-elev);
  text-decoration: none;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.topic-index-card:hover { border-color: var(--accent); }
.tic-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.tic-title { font-size: var(--fs-xl); font-weight: var(--fw-bold); color: var(--fg-strong); }
.tic-count { font-family: var(--font-mono); font-size: 12px; color: var(--fg-faint); white-space: nowrap; }
.tic-en { font-family: var(--font-mono); font-size: 13px; color: var(--fg-faint); }
.tic-blurb { font-size: 14px; color: var(--fg-muted); line-height: 1.5; }