/* ============================================
   Orbit Hub — 轨道资讯中心
   环形布局 × 中央焦点 × 玻璃拟态 × 浅色科技风
   ============================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

:root {
  --bg-base: #f0f2f7;
  --bg-card: rgba(255,255,255,0.65);
  --bg-card-solid: #ffffff;
  --bg-elevated: rgba(255,255,255,0.85);
  --bg-glass: rgba(255,255,255,0.45);
  --text-primary: #1a1d2e;
  --text-secondary: #5a5f7a;
  --text-muted: #8b90a5;
  --accent-blue: #4f6ef7;
  --accent-cyan: #00c6fb;
  --accent-teal: #00e5c3;
  --accent-amber: #f5a623;
  --accent-rose: #f76e8a;
  --accent-violet: #8b5cf6;
  --accent-blue-glow: rgba(79,110,247,0.12);
  --accent-cyan-glow: rgba(0,198,251,0.10);
  --accent-teal-glow: rgba(0,229,195,0.10);
  --accent-amber-glow: rgba(245,166,35,0.10);
  --accent-rose-glow: rgba(247,110,138,0.10);
  --accent-violet-glow: rgba(139,92,246,0.10);
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --glass-border: 1px solid rgba(255,255,255,0.5);
  --glass-shadow: 0 8px 32px rgba(79,110,247,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --glass-shadow-hover: 0 12px 40px rgba(79,110,247,0.14), 0 4px 12px rgba(0,0,0,0.06);
}

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* ===== 微妙动态背景 ===== */
body::before {
  content: '';
  position: fixed;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(79,110,247,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0,198,251,0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(139,92,246,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 30% 60%, rgba(0,229,195,0.03) 0%, transparent 40%);
  z-index: 0;
  pointer-events: none;
  animation: orbit-bg-drift 30s ease-in-out infinite alternate;
}
@keyframes orbit-bg-drift {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(2%, 1%) rotate(3deg); }
}

/* ===== 粒子轨道装饰 ===== */
.oh-orbit-deco {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.oh-orbit-ring {
  position: absolute;
  border: 1px solid rgba(79,110,247,0.06);
  border-radius: 50%;
  animation: orbit-spin 60s linear infinite;
}
.oh-orbit-ring:nth-child(1) {
  width: 600px; height: 600px;
  top: -100px; right: -150px;
  animation-duration: 80s;
}
.oh-orbit-ring:nth-child(2) {
  width: 400px; height: 400px;
  top: 30%; left: -100px;
  animation-duration: 60s;
  animation-direction: reverse;
}
.oh-orbit-ring:nth-child(3) {
  width: 300px; height: 300px;
  bottom: -80px; right: 20%;
  animation-duration: 50s;
}
@keyframes orbit-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== 导航栏 ===== */
.oh-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: rgba(240,242,247,0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(79,110,247,0.08);
}
.oh-nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
}
.oh-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}
.oh-logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 2px 12px rgba(79,110,247,0.3);
  position: relative;
}
.oh-logo-mark::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1.5px solid rgba(79,110,247,0.2);
  animation: orbit-pulse-ring 3s ease-in-out infinite;
}
@keyframes orbit-pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.15); opacity: 0; }
}

.oh-nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.oh-nav-links a {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.3s;
  position: relative;
}
.oh-nav-links a:hover { color: var(--accent-blue); }
.oh-nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  border-radius: 1px;
  transition: width 0.3s var(--ease-out);
}
.oh-nav-links a:hover::after { width: 100%; }

.oh-nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}
.oh-search-btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s;
  color: var(--text-muted);
}
.oh-search-btn:hover {
  background: var(--bg-card);
  color: var(--accent-blue);
  box-shadow: var(--glass-shadow);
}
.oh-search-btn svg { width: 18px; height: 18px; }
.oh-mobile-menu-btn {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}
.oh-mobile-menu-btn svg { width: 22px; height: 22px; }

/* ===== 搜索覆盖层 ===== */
.oh-search-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(240,242,247,0.85);
  backdrop-filter: blur(16px);
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 14vh;
  opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.oh-search-overlay.active { opacity: 1; pointer-events: all; }
.oh-search-overlay-inner {
  width: 100%; max-width: 600px;
  background: var(--bg-card-solid);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px; position: relative;
  max-height: 70vh; overflow-y: auto;
  box-shadow: var(--glass-shadow);
}
.oh-search-close {
  position: absolute; top: 12px; right: 16px;
  font-size: 24px; background: none; border: none;
  cursor: pointer; color: var(--text-muted); line-height: 1;
}
.oh-search-close:hover { color: var(--text-primary); }
.oh-search-box {
  display: flex; align-items: center; gap: 12px;
  border-bottom: 2px solid rgba(79,110,247,0.1);
  padding-bottom: 16px; margin-bottom: 16px;
}
.oh-search-box svg { width: 20px; height: 20px; color: var(--text-muted); flex-shrink: 0; }
.oh-search-input {
  width: 100%; border: none; outline: none;
  font-size: 16px; font-family: var(--font-body);
  background: transparent; color: var(--text-primary);
}
.oh-search-input::placeholder { color: var(--text-muted); }
.oh-search-results { display: flex; flex-direction: column; gap: 4px; }
.oh-search-result-item {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 8px; border-radius: var(--radius-sm);
  text-decoration: none; color: inherit; transition: background 0.2s;
}
.oh-search-result-item:hover { background: rgba(79,110,247,0.04); }
.oh-search-result-thumb {
  width: 56px; height: 40px; border-radius: 6px;
  overflow: hidden; flex-shrink: 0; background: var(--bg-base);
}
.oh-search-result-thumb img { width: 100%; height: 100%; object-fit: cover; }
.oh-search-result-info { flex: 1; min-width: 0; }
.oh-search-result-cat {
  font-size: 10px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--accent-blue); margin-bottom: 2px;
}
.oh-search-result-title {
  font-size: 13px; line-height: 1.4;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.oh-search-empty { text-align: center; padding: 24px; color: var(--text-muted); font-size: 14px; }

/* ===== 轨道焦点区 ===== */
.oh-orbit-hero {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 56px 40px 0;
}

/* 中央焦点新闻 */
.oh-center-focus {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--glass-shadow);
  transition: box-shadow 0.4s, transform 0.4s;
}
.oh-center-focus:hover {
  box-shadow: var(--glass-shadow-hover);
  transform: translateY(-4px);
}
.oh-center-focus img {
  width: 100%;
  height: 520px;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out);
}
.oh-center-focus:hover img { transform: scale(1.03); }
.oh-center-focus-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,29,46,0.88) 0%, rgba(26,29,46,0.15) 45%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 48px;
}
.oh-center-focus .oh-tag { margin-bottom: 16px; }
.oh-center-focus .oh-card-title {
  font-size: clamp(28px, 3.5vw, 44px);
  color: #fff;
  margin-bottom: 12px;
}
.oh-center-focus .oh-card-excerpt {
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  -webkit-line-clamp: 3;
}
.oh-center-focus .oh-card-meta {
  color: rgba(255,255,255,0.5);
  margin-top: 14px;
}
.oh-center-focus .oh-card-meta svg { color: rgba(255,255,255,0.5); }

/* 轨道热点 — 围绕中心的环形分布 */
.oh-orbit-ring-section {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 40px 0;
}
.oh-orbit-ring-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.oh-orbit-ring-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(79,110,247,0.2), transparent);
}

.oh-orbit-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.oh-orbit-node {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition: all 0.4s var(--ease-out);
}
.oh-orbit-node:hover {
  transform: translateY(-6px);
  box-shadow: var(--glass-shadow-hover);
}
.oh-orbit-node-img {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.oh-orbit-node-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.oh-orbit-node:hover .oh-orbit-node-img img { transform: scale(1.06); }
.oh-orbit-node-body {
  padding: 16px 18px 20px;
}
.oh-orbit-node .oh-tag { margin-bottom: 8px; }
.oh-orbit-node .oh-card-title {
  font-size: 15px;
  margin-bottom: 6px;
}
.oh-orbit-node .oh-card-excerpt {
  font-size: 13px;
  -webkit-line-clamp: 2;
}

/* 轨道连接线装饰 */
.oh-orbit-connector {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 80%;
  height: 80%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 0;
}

/* ===== 通用标签 ===== */
.oh-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
  width: fit-content;
}
.oh-tag--blue { background: var(--accent-blue-glow); color: var(--accent-blue); }
.oh-tag--cyan { background: var(--accent-cyan-glow); color: var(--accent-cyan); }
.oh-tag--teal { background: var(--accent-teal-glow); color: var(--accent-teal); }
.oh-tag--amber { background: var(--accent-amber-glow); color: var(--accent-amber); }
.oh-tag--rose { background: var(--accent-rose-glow); color: var(--accent-rose); }
.oh-tag--violet { background: var(--accent-violet-glow); color: var(--accent-violet); }

.oh-card-title {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.oh-card-excerpt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.oh-card-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.oh-card-meta span { display: flex; align-items: center; gap: 5px; }
.oh-card-meta svg { width: 12px; height: 12px; }

/* ===== 数据统计条 ===== */
.oh-stats {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 40px;
}
.oh-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.oh-stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--glass-shadow);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}
.oh-stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
}
.oh-stat-card--blue::before { background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan)); }
.oh-stat-card--cyan::before { background: linear-gradient(90deg, var(--accent-cyan), var(--accent-teal)); }
.oh-stat-card--teal::before { background: linear-gradient(90deg, var(--accent-teal), var(--accent-blue)); }
.oh-stat-card--amber::before { background: linear-gradient(90deg, var(--accent-amber), var(--accent-rose)); }
.oh-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glass-shadow-hover);
}
.oh-stat-number {
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.oh-stat-card--amber .oh-stat-number {
  background: linear-gradient(135deg, var(--accent-amber), var(--accent-rose));
  -webkit-background-clip: text;
  background-clip: text;
}
.oh-stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}
.oh-stat-sub {
  font-size: 11px;
  margin-top: 8px;
  font-weight: 600;
  color: var(--accent-teal);
}

/* ===== 引言区 ===== */
.oh-quote {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 56px 40px;
  text-align: center;
}
.oh-quote::before {
  content: '\201C';
  font-size: 140px;
  color: rgba(79,110,247,0.06);
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  line-height: 1;
  pointer-events: none;
}
.oh-quote-text {
  font-size: clamp(20px, 2.8vw, 32px);
  font-weight: 300;
  line-height: 1.5;
  max-width: 800px;
  margin: 0 auto 20px;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}
.oh-quote-author {
  font-size: 13px;
  color: var(--accent-blue);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 600;
}

/* ===== Section 标题 ===== */
.oh-section {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 56px 40px 0;
}
.oh-section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 32px;
}
.oh-section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 8px;
}
.oh-section-title {
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
}
.oh-section-more {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s var(--ease-out);
  flex-shrink: 0;
}
.oh-section-more:hover { gap: 12px; }
.oh-section-more svg { width: 14px; height: 14px; }

/* ===== 最新资讯网格 ===== */
.oh-news-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.oh-news-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--glass-shadow);
  transition: all 0.4s var(--ease-out);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}
.oh-news-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--glass-shadow-hover);
}
.oh-news-card-img {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.oh-news-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.oh-news-card:hover .oh-news-card-img img { transform: scale(1.06); }
.oh-news-card-body {
  padding: 18px 20px 22px;
}
.oh-news-card .oh-tag { margin-bottom: 8px; }
.oh-news-card .oh-card-title {
  font-size: 15px;
  margin-bottom: 6px;
}
.oh-news-card .oh-card-excerpt {
  font-size: 13px;
  -webkit-line-clamp: 2;
}

/* ===== 文章流 ===== */
.oh-stream-list {
  display: flex;
  flex-direction: column;
}
.oh-stream-item {
  display: grid;
  grid-template-columns: 80px 1fr 100px;
  gap: 24px;
  align-items: center;
  padding: 20px 18px;
  border-bottom: 1px solid rgba(79,110,247,0.06);
  border-radius: var(--radius-sm);
  transition: background 0.3s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}
.oh-stream-item:first-child { border-top: 1px solid rgba(79,110,247,0.06); }
.oh-stream-item:hover { background: rgba(79,110,247,0.03); }
.oh-stream-date {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  font-weight: 500;
}
.oh-stream-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  transition: color 0.3s;
}
.oh-stream-item:hover .oh-stream-title { color: var(--accent-blue); }
.oh-stream-cat {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-align: right;
  padding: 3px 10px;
  border-radius: 20px;
  width: fit-content;
  margin-left: auto;
}
.oh-stream-cat--wc { color: var(--accent-cyan); background: var(--accent-cyan-glow); }
.oh-stream-cat--gen { color: var(--accent-amber); background: var(--accent-amber-glow); }
.oh-stream-cat--soc { color: var(--accent-teal); background: var(--accent-teal-glow); }
.oh-stream-cat--nhl { color: var(--accent-violet); background: var(--accent-violet-glow); }

/* ===== Footer ===== */
.oh-footer {
  position: relative;
  z-index: 1;
  background: var(--bg-card-solid);
  border-top: 1px solid rgba(79,110,247,0.06);
  padding: 64px 0 32px;
  margin-top: 64px;
}
.oh-footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
}
.oh-footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 48px;
}
.oh-footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.oh-footer-brand-mark {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800; color: #fff;
}
.oh-footer-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 300px;
}
.oh-footer-heading {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.oh-footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.oh-footer-links a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: color 0.3s;
}
.oh-footer-links a:hover { color: var(--accent-blue); }
.oh-footer-bottom {
  border-top: 1px solid rgba(79,110,247,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== 进入动画 ===== */
.oh-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.oh-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.oh-reveal-delay-1 { transition-delay: 0.1s; }
.oh-reveal-delay-2 { transition-delay: 0.2s; }
.oh-reveal-delay-3 { transition-delay: 0.3s; }

/* ===== 文章详情页 ===== */
.oh-article-hero {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 40px 32px;
}
.oh-article-hero-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.oh-article-hero-title {
  font-size: clamp(30px, 4.5vw, 52px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 20px;
  max-width: 720px;
}
.oh-article-hero-meta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 20px;
}
.oh-article-hero-meta span { display: flex; align-items: center; gap: 6px; }
.oh-article-hero-meta svg { width: 14px; height: 14px; }

.oh-article-cover {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto 48px;
  padding: 0 40px;
}
.oh-article-cover img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  border-radius: var(--radius-xl);
  box-shadow: var(--glass-shadow);
}

.oh-article-body {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 40px 64px;
}
.oh-article-body p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.oh-article-body p:first-of-type::first-letter {
  font-size: 56px;
  font-weight: 800;
  float: left;
  line-height: 0.8;
  margin-right: 12px;
  margin-top: 6px;
  color: var(--accent-blue);
}
.oh-article-body h2 {
  font-size: 26px;
  font-weight: 800;
  line-height: 1.3;
  margin: 40px 0 16px;
  color: var(--text-primary);
}
.oh-article-body blockquote {
  border-left: 3px solid var(--accent-blue);
  padding: 16px 0 16px 24px;
  margin: 32px 0;
  font-size: 18px;
  font-style: italic;
  line-height: 1.6;
  color: var(--text-primary);
}

/* 详情页媒体区 */
.oh-article-media {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px 48px;
}
.oh-article-media-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}
.oh-article-media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.oh-article-media-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--glass-shadow);
}
.oh-article-media-item img {
  width: 100%; height: 200px; object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.oh-article-media-item:hover img { transform: scale(1.04); }

/* 详情页相关文章 */
.oh-article-related {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px 64px;
}
.oh-article-related-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.oh-article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.oh-related-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--glass-shadow);
  transition: all 0.3s var(--ease-out);
  cursor: pointer;
}
.oh-related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glass-shadow-hover);
}
.oh-related-card-img {
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.oh-related-card-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.oh-related-card:hover .oh-related-card-img img { transform: scale(1.05); }
.oh-related-card-body {
  padding: 16px 18px 20px;
}
.oh-related-card-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.oh-related-card-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .oh-orbit-grid { grid-template-columns: repeat(3, 1fr); }
  .oh-news-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
  .oh-center-focus img { height: 420px; }
  .oh-orbit-grid { grid-template-columns: repeat(3, 1fr); }
  .oh-news-grid { grid-template-columns: repeat(2, 1fr); }
  .oh-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .oh-article-related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .oh-nav-inner { padding: 0 20px; }
  .oh-nav-links { display: none; }
  .oh-mobile-menu-btn { display: flex; }
  .oh-orbit-hero { padding: 32px 20px 0; }
  .oh-center-focus img { height: 320px; }
  .oh-center-focus-overlay { padding: 28px; }
  .oh-orbit-ring-section { padding: 36px 20px 0; }
  .oh-orbit-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .oh-section { padding: 40px 20px 0; }
  .oh-news-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .oh-stats { padding: 36px 20px; }
  .oh-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .oh-quote { padding: 40px 20px; }
  .oh-footer-inner { padding: 0 20px; }
  .oh-footer-top { grid-template-columns: 1fr; gap: 32px; }
  .oh-article-hero { padding: 32px 20px 24px; }
  .oh-article-cover { padding: 0 20px; }
  .oh-article-cover img { height: 280px; border-radius: var(--radius-lg); }
  .oh-article-body { padding: 0 20px 48px; }
  .oh-article-media { padding: 0 20px 36px; }
  .oh-article-media-grid { grid-template-columns: 1fr 1fr; }
  .oh-article-related { padding: 0 20px 48px; }
  .oh-article-related-grid { grid-template-columns: 1fr; }
  .oh-stream-item { grid-template-columns: 60px 1fr 80px; gap: 12px; }
}

@media (max-width: 480px) {
  .oh-orbit-grid { grid-template-columns: 1fr; }
  .oh-news-grid { grid-template-columns: 1fr; }
  .oh-stats-grid { grid-template-columns: 1fr; }
  .oh-article-media-grid { grid-template-columns: 1fr; }
  .oh-center-focus img { height: 260px; }
  .oh-center-focus .oh-card-title { font-size: 22px; }
}