/* OD体育 - 主样式 */
/* 设计：双栏首页 + 侧栏文档风 */
/* DESIGN_VARIANCE: 7; MOTION_INTENSITY: 6; VISUAL_DENSITY: 4 */

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

:root {
  --primary: #0d6efd;
  --primary-light: #3d8bfd;
  --primary-dark: #0a58ca;
  --secondary: #dc3545;
  --accent: #ffc107;
  --bg: #f8f9fa;
  --surface: #ffffff;
  --dark: #121212;
  --darker: #0d0d0d;
  --gray: #6c757d;
  --gray-light: #dee2e6;
  --text: #212529;
  --text-light: #495057;
  --border: #dee2e6;
  --radius: 12px;
  --radius-sm: 8px;
  --sidebar-width: 254px;
  --main-width: min(760px, 100%);
  --container-max: 1140px;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.10);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --surface: #1e1e1e;
    --gray: #9ca3af;
    --gray-light: #2d2d2d;
    --text: #e5e7eb;
    --text-light: #9ca3af;
    --border: #333;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
    --shadow: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-hover: 0 8px 32px rgba(0,0,0,0.4);
  }
}

html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-body); color: var(--text); background: var(--bg); line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* 统一页头 */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(10px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 36px; width: auto; }
.logo-text { font-family: var(--font-heading); font-size: 1.4rem; font-weight: 800; color: var(--text); }
.site-nav { display: flex; gap: 28px; }
.site-nav a { font-size: 0.9rem; font-weight: 500; color: var(--text-light); padding: 4px 0; }
.site-nav a:hover, .site-nav a.active { color: var(--primary); }

.mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 4px 0; border-radius: 2px; }

@media (max-width: 900px) {
  .site-nav { display: none; }
  .mobile-toggle { display: block; }
  .site-nav.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--surface); padding: 24px; border-top: 1px solid var(--border); box-shadow: 0 8px 24px rgba(0,0,0,0.1); gap: 16px; }
}

/* 统一页脚 */
.site-footer {
  background: var(--darker); color: var(--gray);
  padding: 56px 0 24px; margin-top: 80px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand { margin-bottom: 16px; }
.footer-brand .logo img { height: 28px; }
.footer-desc { margin-top: 12px; font-size: 0.85rem; line-height: 1.7; max-width: 320px; }
.footer-col h4 { font-size: 0.9rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col a { color: var(--gray); font-size: 0.85rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.08); display: flex; justify-content: space-between; align-items: center; font-size: 0.8rem; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; gap: 12px; text-align: center; } }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: var(--radius-sm);
  font-family: var(--font-heading); font-weight: 600; font-size: 0.9rem;
  cursor: pointer; border: none; transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(13,110,253,0.3); }
.btn-secondary { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-secondary:hover { background: var(--primary); color: #fff; }

/* 面包屑 */
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem; color: var(--gray); margin-bottom: 24px;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { color: var(--gray); }

/* 英雄区 */
.hero-section {
  padding: 80px 0 0; text-align: center;
}
.hero-section h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800; line-height: 1.1;
  margin-bottom: 20px;
}
.hero-section p {
  font-size: 1.05rem; color: var(--text-light);
  max-width: 640px; margin: 0 auto 36px;
}

/* 栏目卡片 */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 48px 0; }
.cat-card {
  background: var(--surface); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: all 0.3s;
}
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.cat-card-img { width: 100%; height: 160px; object-fit: cover; }
.cat-card-body { padding: 20px; }
.cat-card-body h3 { font-family: var(--font-heading); font-size: 1.1rem; margin-bottom: 8px; }
.cat-card-body p { font-size: 0.85rem; color: var(--text-light); margin-bottom: 16px; }

/* 文章卡片 */
.articles-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 48px 0;
}
.article-card {
  background: var(--surface); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.article-card-img { width: 100%; height: 180px; object-fit: cover; }
.article-card-body { padding: 20px; }
.article-card-body .tag {
  display: inline-block; font-size: 0.7rem; font-weight: 600;
  background: rgba(13,110,253,0.1); color: var(--primary);
  padding: 3px 10px; border-radius: 20px; margin-bottom: 10px;
}
.article-card-title {
  font-family: var(--font-heading); font-size: 1rem; font-weight: 700;
  margin-bottom: 8px; line-height: 1.4;
}
.article-card-excerpt { font-size: 0.8rem; color: var(--text-light); margin-bottom: 12px; }
.article-card-meta { font-size: 0.75rem; color: var(--gray); }

@media (max-width: 1024px) { .articles-grid, .cat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .articles-grid, .cat-grid { grid-template-columns: 1fr; } }

/* 文章详情页布局 */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px; padding: 48px 0;
}
@media (max-width: 1024px) { .article-layout { grid-template-columns: 1fr; } }

.article-main .article-header { margin-bottom: 36px; }
.article-main .article-meta { display: flex; gap: 16px; font-size: 0.85rem; color: var(--gray); margin-bottom: 16px; }
.article-main .article-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  font-weight: 800; line-height: 1.2; margin-bottom: 16px;
}
.article-main .article-excerpt { font-size: 1rem; color: var(--text-light); line-height: 1.7; }

.article-content { line-height: 1.8; }
.article-content h2 { font-family: var(--font-heading); font-size: 1.5rem; margin: 40px 0 20px; }
.article-content h3 { font-size: 1.2rem; margin: 28px 0 16px; }
.article-content p { margin-bottom: 20px; }
.article-content ul, .article-content ol { margin-bottom: 20px; padding-left: 24px; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote {
  border-left: 3px solid var(--primary); padding-left: 20px;
  margin: 24px 0; color: var(--text-light); font-style: italic;
}
.article-img { margin: 28px 0; border-radius: var(--radius-sm); overflow: hidden; }
.img-caption { font-size: 0.8rem; color: var(--gray); text-align: center; margin: 8px 0 24px; }

/* 侧栏 */
.article-aside { }
.related-box {
  background: var(--surface); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow-sm);
  position: sticky; top: 96px;
}
.related-box h3 {
  font-family: var(--font-heading); font-size: 1rem;
  padding-bottom: 12px; border-bottom: 2px solid var(--primary);
  margin-bottom: 16px;
}
.related-list { display: flex; flex-direction: column; gap: 12px; }
.related-item {
  padding: 12px; border-radius: var(--radius-sm);
  background: var(--bg); transition: all 0.2s;
}
.related-item:hover { transform: translateX(4px); }
.related-item h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.related-item h4 a { color: var(--text); }
.related-item h4 a:hover { color: var(--primary); }
.related-item .meta { font-size: 0.75rem; color: var(--gray); }

/* 栏目页 */
.category-layout { padding: 48px 0; }
.category-header { text-align: center; margin-bottom: 48px; }
.category-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  font-weight: 800; margin-bottom: 12px;
}
.category-header p { font-size: 1rem; color: var(--text-light); max-width: 560px; margin: 0 auto; }

/* section 通用 */
.section-block { padding: 64px 0; }
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700; margin-bottom: 16px;
}
.section-desc { color: var(--text-light); max-width: 560px; margin-bottom: 40px; }
.tagline { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--primary); margin-bottom: 8px; }

/* CTA */
.cta-block { background: var(--primary); color: #fff; text-align: center; padding: 80px 0; margin: 48px 0; }
.cta-block .section-title { color: #fff; }
.cta-block .section-desc { color: rgba(255,255,255,0.8); margin: 0 auto 32px; }
.cta-block .btn { background: #fff; color: var(--primary); }
.cta-block .btn:hover { background: rgba(255,255,255,0.9); }

/* stats 数据条 */
.stats-bar {
  background: var(--surface); padding: 48px 0;
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num { font-family: var(--font-heading); font-size: 2.2rem; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 0.85rem; color: var(--gray); margin-top: 4px; }
@media (max-width: 640px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

/* 信任条/亮点 */
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.trust-item { text-align: center; padding: 32px 16px; }
.trust-item .icon { font-size: 2rem; margin-bottom: 12px; }
@media (max-width: 640px) { .trust-grid { grid-template-columns: 1fr; } }

/* 首页 section 通用 */
main section { scroll-margin-top: 88px; }