:root {
  --topic-text: #0d1b2e;
  --topic-muted: #5b6b7f;
  --topic-subtle: #8491a3;
  --topic-border: #dde5ef;
  --topic-surface: #f6f8fb;
  --topic-blue: #0b63e5;
  --topic-navy: #082d68;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--topic-text);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 3px solid rgba(11,99,229,.28); outline-offset: 3px; }
.topic-container { width: min(calc(100% - 40px), 1120px); margin: 0 auto; }

.topic-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(221,229,239,.92);
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(16px);
}
.topic-header-inner { min-height: 64px; display: flex; align-items: center; gap: 26px; }
.topic-brand { text-decoration: none; font-weight: 780; letter-spacing: -.02em; }
.topic-nav { margin-left: auto; display: flex; gap: 22px; }
.topic-nav a { color: var(--topic-muted); text-decoration: none; font-size: 14px; font-weight: 620; }
.topic-nav a:hover { color: var(--topic-blue); }
.topic-cta { padding: 9px 14px; border-radius: 8px; background: var(--topic-blue); color: #fff !important; }

.topic-hero { padding: 76px 0 62px; background: var(--topic-navy); color: #fff; }
.topic-kicker { display: block; margin-bottom: 16px; color: rgba(255,255,255,.58); font-size: 12px; font-weight: 760; letter-spacing: .12em; }
.topic-hero h1 { max-width: 800px; margin: 0; font-size: clamp(42px, 6vw, 68px); line-height: 1.08; letter-spacing: -.05em; }
.topic-hero p { max-width: 760px; margin: 22px 0 0; color: rgba(255,255,255,.72); font-size: 18px; line-height: 1.85; }

.topic-body { padding: 62px 0 82px; }
.topic-intro { display: grid; grid-template-columns: minmax(0,.72fr) minmax(0,1.28fr); gap: 70px; padding-bottom: 34px; border-bottom: 1px solid var(--topic-border); }
.topic-intro h2 { margin: 0; font-size: 28px; letter-spacing: -.035em; }
.topic-intro p { margin: 0; color: var(--topic-muted); font-size: 15px; }
.topic-list { border-top: 1px solid var(--topic-border); }
.topic-article { display: grid; grid-template-columns: 120px minmax(0,1fr) auto; gap: 26px; align-items: start; padding: 28px 0; border-bottom: 1px solid var(--topic-border); text-decoration: none; }
.topic-article:hover h3 { color: var(--topic-blue); }
.topic-article-no { color: var(--topic-subtle); font-size: 12px; font-variant-numeric: tabular-nums; }
.topic-article h3 { margin: 0; font-size: 22px; line-height: 1.45; letter-spacing: -.02em; transition: color .15s ease; }
.topic-article p { max-width: 760px; margin: 8px 0 0; color: var(--topic-muted); font-size: 14px; line-height: 1.7; }
.topic-article time { color: var(--topic-subtle); font-size: 12px; white-space: nowrap; font-variant-numeric: tabular-nums; }

.topic-more { margin-top: 48px; padding: 28px 0; border-top: 1px solid var(--topic-border); border-bottom: 1px solid var(--topic-border); display: flex; justify-content: space-between; gap: 24px; align-items: center; }
.topic-more h2 { margin: 0; font-size: 24px; }
.topic-more p { margin: 6px 0 0; color: var(--topic-muted); font-size: 14px; }
.topic-more a { color: var(--topic-blue); font-weight: 720; text-decoration: none; }
.topic-footer { padding: 38px 0 46px; color: var(--topic-subtle); font-size: 12px; }
.topic-footer-inner { display: flex; justify-content: space-between; gap: 24px; padding-top: 20px; border-top: 1px solid var(--topic-border); }
.topic-footer a { color: var(--topic-muted); text-decoration: none; }

@media (max-width: 760px) {
  .topic-container { width: min(calc(100% - 28px), 1120px); }
  .topic-header-inner { min-height: 58px; }
  .topic-nav a:not(.topic-cta) { display: none; }
  .topic-hero { padding: 54px 0 48px; }
  .topic-hero h1 { font-size: 40px; }
  .topic-hero p { font-size: 15px; }
  .topic-body { padding: 44px 0 62px; }
  .topic-intro { grid-template-columns: 1fr; gap: 14px; }
  .topic-article { grid-template-columns: 42px minmax(0,1fr); gap: 14px; }
  .topic-article time { grid-column: 2; }
  .topic-article h3 { font-size: 19px; }
  .topic-more { align-items: flex-start; flex-direction: column; }
  .topic-footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}