*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black: #0A0A0A;
  --white: #FFFFFF;
  --off-white: #F5F5F3;
  --gray-100: #F0EFED;
  --gray-200: #E0DFDC;
  --gray-300: #C8C7C3;
  --gray-400: #A8A7A3;
  --gray-500: #787672;
  --gray-600: #4A4845;
  --gray-700: #2E2D2B;
  --border: #E0DFDC;
  --border-dark: rgba(255,255,255,0.1);
}

html { scroll-behavior: smooth; }
body { font-family: 'Archivo', -apple-system, sans-serif; background: #fff; color: var(--black); line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased; }

/* ── ARTICLE HERO ── */
.article-hero {
  background: var(--black);
  padding: 8rem 3rem 5rem;
  position: relative;
}

.article-hero-inner { max-width: 860px; margin: 0 auto; }

.article-back {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 13px; font-weight: 500; color: rgba(255,255,255,0.4);
  text-decoration: none; letter-spacing: 0.04em;
  margin-bottom: 2.5rem; transition: color 0.2s;
}
.article-back:hover { color: rgba(255,255,255,0.85); }

.article-meta-top {
  display: flex; align-items: center; gap: 1rem; margin-bottom: 2rem;
}
.article-cat-badge {
  font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--black); background: var(--white); padding: 0.3rem 0.875rem; border-radius: 2px;
}
.article-date, .article-read-time {
  font-size: 13px; font-weight: 300; color: rgba(255,255,255,0.4);
}
.article-read-time::before { content: '·'; margin-right: 1rem; }

.article-hero-title {
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  font-weight: 800; line-height: 1.06; letter-spacing: -0.035em;
  color: var(--white); margin-bottom: 2rem;
}

.article-hero-lead {
  font-size: 1.1rem; font-weight: 300;
  color: rgba(255,255,255,0.72); line-height: 1.8;
  max-width: 680px;
  border-top: 1px solid rgba(255,255,255,0.12); padding-top: 1.75rem;
}

/* ── COVER ── */
.article-cover {
  max-width: 100%; height: 460px; overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.article-cover-img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.article-cover-placeholder {
  width: 100%; height: 100%;
  background: linear-gradient(135deg, #0f1a2e 0%, #162840 50%, #0f3460 100%);
}

/* ── LAYOUT ── */
.article-layout {
  max-width: 1200px; margin: 0 auto;
  padding: 5rem 3rem;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 6rem;
  align-items: start;
}

/* ── BODY ── */
.article-body { min-width: 0; }

.article-body p {
  font-size: 1.0625rem; font-weight: 300; color: var(--gray-700);
  line-height: 1.88; margin-bottom: 1.75rem;
}

.article-body h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 800; color: var(--black);
  letter-spacing: -0.025em; line-height: 1.2;
  margin: 3.5rem 0 1.25rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.article-body h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }

.article-body h3 {
  font-size: 1.125rem; font-weight: 700; color: var(--black);
  letter-spacing: -0.015em; margin: 2.5rem 0 0.875rem;
}

.article-body ul, .article-body ol {
  margin: 0 0 1.75rem 1.5rem;
}
.article-body li {
  font-size: 1.0625rem; font-weight: 300; color: var(--gray-700);
  line-height: 1.75; margin-bottom: 0.5rem;
}

.article-body strong { font-weight: 700; color: var(--black); }

.article-body a {
  color: var(--black); text-decoration: underline;
  text-underline-offset: 3px; transition: opacity 0.2s;
}
.article-body a:hover { opacity: 0.5; }

/* In-body image */
.article-img {
  margin: 2.5rem 0;
  border-radius: 3px;
  overflow: hidden;
}
.article-img img {
  width: 100%;
  display: block;
  border-radius: 3px;
}
.article-img-placeholder {
  width: 100%;
  height: 320px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed #C8C7C3;
  background: #F5F5F3;
  color: #A8A7A3;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.02em;
}
.article-img figcaption {
  font-size: 13px;
  font-weight: 300;
  color: #A8A7A3;
  margin-top: 0.75rem;
  line-height: 1.5;
  font-style: italic;
}

/* Full-bleed image (wider than text column) */
.article-img.full-bleed {
  margin-left: -3rem;
  margin-right: -3rem;
  border-radius: 0;
}
.article-img.full-bleed img {
  border-radius: 0;
}

/* Pull quote */
.article-pullquote {
  margin: 3rem 0; padding: 3rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.article-pullquote p {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem) !important;
  font-weight: 700 !important; color: var(--black) !important;
  letter-spacing: -0.025em; line-height: 1.3 !important; margin: 0 !important;
}

/* Takeaways */
.article-takeaways {
  background: var(--black); padding: 2.5rem; margin: 3rem 0;
}
.article-takeaways-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: rgba(255,255,255,0.4); margin-bottom: 1.5rem;
}
.article-takeaways ul { list-style: none; padding: 0; margin: 0; }
.article-takeaways li {
  font-size: 1rem; font-weight: 400; color: rgba(255,255,255,0.85) !important;
  line-height: 1.65; padding: 0.875rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex; gap: 1rem; margin: 0;
}
.article-takeaways li::before { content: '→'; color: rgba(255,255,255,0.3); flex-shrink: 0; }
.article-takeaways li:last-child { border-bottom: none; }

/* ── SIDEBAR ── */
.article-sidebar { position: sticky; top: 80px; }

.sidebar-section {
  padding-bottom: 2rem; margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-label {
  font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-400); margin-bottom: 1rem;
}
.sidebar-author-name { font-size: 15px; font-weight: 700; color: var(--black); margin-bottom: 0.25rem; }
.sidebar-author-role { font-size: 13px; font-weight: 300; color: var(--gray-500); }

.sidebar-toc-list { list-style: none; padding: 0; margin: 0; }
.sidebar-toc-list li { border-top: 1px solid var(--border); }
.sidebar-toc-list a {
  display: block; font-size: 13px; font-weight: 400; color: var(--gray-500);
  text-decoration: none; padding: 0.75rem 0; transition: color 0.2s, padding-left 0.2s;
  line-height: 1.45;
}
.sidebar-toc-list a:hover { color: var(--black); padding-left: 0.5rem; }
.sidebar-toc-list a.active { color: var(--black); font-weight: 700; }

.sidebar-share-btns { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.share-btn {
  font-family: 'Archivo', sans-serif; font-size: 12px; font-weight: 600;
  letter-spacing: 0.04em; color: var(--black);
  border: 1px solid var(--border); padding: 0.45rem 1rem; border-radius: 2px;
  text-decoration: none; background: none; cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.share-btn:hover { background: var(--gray-100); border-color: var(--gray-300); }

/* ── RELATED ── */
.article-related {
  border-top: 1px solid var(--border);
  background: var(--off-white);
  padding: 5rem 3rem;
}
.article-related-inner { max-width: 1200px; margin: 0 auto; }
.article-related-label {
  font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-500); margin-bottom: 2.5rem;
}
.related-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border);
}
.related-card {
  padding: 2rem; border-right: 1px solid var(--border);
  text-decoration: none; display: block; transition: background 0.2s;
}
.related-card:last-child { border-right: none; }
.related-card:hover { background: var(--white); }
.related-card-cover {
  height: 200px; border-radius: 2px; margin-bottom: 1.25rem;
}
.related-card-tag {
  font-size: 10px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-500); margin-bottom: 0.5rem; display: block;
}
.related-card-title {
  font-size: 1rem; font-weight: 700; color: var(--black);
  line-height: 1.35; letter-spacing: -0.015em;
}

/* ── CTA ── */
.article-cta {
  background: var(--black); padding: 5rem 3rem;
}
.article-cta-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr auto;
  gap: 4rem; align-items: center;
}
.article-cta-label {
  font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: rgba(255,255,255,0.4); margin-bottom: 1rem;
}
.article-cta-title {
  font-size: clamp(1.5rem, 3vw, 2.5rem); font-weight: 800;
  color: var(--white); line-height: 1.15; letter-spacing: -0.03em;
}
.article-cta-btn {
  display: inline-flex; align-items: center; gap: 0.75rem;
  background: var(--white); color: var(--black);
  font-family: 'Archivo', sans-serif; font-size: 14px; font-weight: 700;
  text-decoration: none; padding: 1rem 2rem; border-radius: 2px;
  white-space: nowrap; transition: opacity 0.2s;
}
.article-cta-btn:hover { opacity: 0.85; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .article-hero { padding: 6rem 1.5rem 3rem; }
  .article-cover { height: 240px; }
  .article-layout { grid-template-columns: 1fr; padding: 3rem 1.5rem; gap: 3rem; }
  .article-sidebar { position: static; }
  .article-related, .article-cta { padding: 3rem 1.5rem; }
  .related-grid { grid-template-columns: 1fr; }
  .related-card { border-right: none; border-bottom: 1px solid var(--border); }
  .article-cta-inner { grid-template-columns: 1fr; gap: 2rem; }
}

/* ── 相关文章封面（特色图） ── */
.related-card-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }