/* ===== 全局样式 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #1a6ef5;
  --dark: #0d1117;
  --dark2: #161b22;
  --dark3: #21262d;
  --text: #e6edf3;
  --text2: #8b949e;
  --border: #30363d;
  --accent: #58a6ff;
  --green: #3fb950;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 导航栏 ===== */
.navbar {
  background: rgba(13,17,23,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 2rem;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.nav-logo .logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #1a6ef5, #a855f7);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text2);
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  text-decoration: none;
}

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #0d1628 100%);
  border-bottom: 1px solid var(--border);
  padding: 80px 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(26,110,245,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-tag {
  display: inline-block;
  background: rgba(88,166,255,0.1);
  border: 1px solid rgba(88,166,255,0.3);
  color: var(--accent);
  font-size: 0.8rem;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  background: linear-gradient(135deg, #e6edf3 30%, #58a6ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text2);
  max-width: 580px;
  margin: 0 auto 2rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 2.5rem;
}

.stat { text-align: center; }
.stat-num { font-size: 1.8rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.8rem; color: var(--text2); margin-top: 2px; }

/* ===== 主体容器 ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== 分类标签栏 ===== */
.category-bar {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.cat-tag {
  padding: 5px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  color: var(--text2);
  cursor: pointer;
  transition: all 0.2s;
  background: transparent;
}

.cat-tag:hover, .cat-tag.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  text-decoration: none;
}

/* ===== 内容区布局 ===== */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  padding: 2.5rem 0 4rem;
}

/* ===== 文章卡片 ===== */
.articles { display: flex; flex-direction: column; gap: 1.5rem; }

.article-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.8rem;
  transition: border-color 0.2s, transform 0.2s;
  cursor: pointer;
}

.article-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.article-card.featured {
  background: linear-gradient(135deg, rgba(26,110,245,0.08), rgba(13,17,23,0));
  border-color: rgba(88,166,255,0.3);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.82rem;
  color: var(--text2);
}

.card-badge {
  background: rgba(63,185,80,0.15);
  color: var(--green);
  border: 1px solid rgba(63,185,80,0.3);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
}

.card-badge.ai { background: rgba(88,166,255,0.1); color: var(--accent); border-color: rgba(88,166,255,0.3); }
.card-badge.hot { background: rgba(248,81,73,0.1); color: #f85149; border-color: rgba(248,81,73,0.3); }

.article-card h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--text);
  line-height: 1.4;
}

.article-card h2 a {
  color: inherit;
}

.article-card h2 a:hover {
  color: var(--accent);
  text-decoration: none;
}

.article-card p {
  color: var(--text2);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 1.2rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text2);
}

.card-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.card-tag {
  background: var(--dark3);
  padding: 2px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  color: var(--text2);
}

.card-info { display: flex; gap: 1rem; }
.card-info span { display: flex; align-items: center; gap: 4px; }

/* ===== 侧边栏 ===== */
.sidebar { display: flex; flex-direction: column; gap: 1.5rem; }

.widget {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem;
}

.widget-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.widget-title::before {
  content: '';
  width: 3px;
  height: 14px;
  background: var(--primary);
  border-radius: 2px;
}

/* 热门文章 */
.hot-list { list-style: none; display: flex; flex-direction: column; gap: 1rem; }
.hot-item { display: flex; gap: 12px; align-items: flex-start; }
.hot-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text2);
  min-width: 20px;
}
.hot-num.top { color: var(--accent); }
.hot-item a { font-size: 0.88rem; color: var(--text2); line-height: 1.5; }
.hot-item a:hover { color: var(--text); text-decoration: none; }

/* 标签云 */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag-cloud a {
  background: var(--dark3);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text2);
  transition: all 0.2s;
}
.tag-cloud a:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* 公告 */
.notice-box {
  background: rgba(88,166,255,0.06);
  border: 1px solid rgba(88,166,255,0.2);
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.85rem;
  color: var(--text2);
  line-height: 1.7;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem 1.5rem;
  text-align: center;
}

.footer-inner { max-width: 1100px; margin: 0 auto; }

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  list-style: none;
  margin-bottom: 1.5rem;
  font-size: 0.88rem;
}

.footer-links a { color: var(--text2); }
.footer-links a:hover { color: var(--text); }

.footer-copy {
  font-size: 0.82rem;
  color: var(--text2);
  line-height: 2;
}

.beian {
  color: var(--text2);
  font-size: 0.82rem;
}
.beian a { color: var(--text2); }
.beian a:hover { color: var(--accent); }

/* ===== 文章详情页 ===== */
.article-hero {
  padding: 3rem 2rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--dark2);
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--text2);
  margin-bottom: 1.5rem;
}
.breadcrumb a { color: var(--text2); }
.breadcrumb a:hover { color: var(--accent); }

.article-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text2);
  flex-wrap: wrap;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 2.5rem;
  padding: 2.5rem 0 4rem;
}

.article-content {
  font-size: 1rem;
  line-height: 1.9;
  color: #cdd9e5;
}

.article-content h2 {
  font-size: 1.4rem;
  color: var(--text);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.article-content h3 {
  font-size: 1.1rem;
  color: var(--text);
  margin: 1.5rem 0 0.8rem;
}

.article-content p { margin-bottom: 1.2rem; }

.article-content ul, .article-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

.article-content li { margin-bottom: 0.5rem; }

.article-content blockquote {
  border-left: 3px solid var(--primary);
  padding: 0.8rem 1.2rem;
  background: rgba(26,110,245,0.06);
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
  color: var(--text2);
}

.article-content .highlight-box {
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
}

/* 目录 */
.toc {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem;
  position: sticky;
  top: 80px;
}

.toc-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.toc-list a { font-size: 0.85rem; color: var(--text2); }
.toc-list a:hover { color: var(--accent); text-decoration: none; }
.toc-list .toc-sub { padding-left: 1rem; }
.toc-list .toc-sub a { font-size: 0.82rem; }

/* ===== 关于页 ===== */
.about-hero {
  padding: 4rem 2rem;
  text-align: center;
  background: linear-gradient(135deg, #0d1117, #161b22);
  border-bottom: 1px solid var(--border);
}

.about-content {
  max-width: 720px;
  margin: 3rem auto;
  padding: 0 2rem 4rem;
}

.about-content h2 {
  font-size: 1.4rem;
  margin: 2rem 0 1rem;
  color: var(--text);
}

.about-content p { color: var(--text2); line-height: 1.9; margin-bottom: 1rem; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.feature-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  text-align: center;
}

.feature-icon { font-size: 2rem; margin-bottom: 0.8rem; }
.feature-card h3 { font-size: 0.95rem; margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.82rem; color: var(--text2); margin: 0; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .main-layout, .article-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .hero-stats { gap: 1.5rem; }
  .nav-links { display: none; }
  .hero { padding: 50px 1.5rem; }
}