/* === Agent评测 设计系统 v1.0 === */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.06);
  --shadow-xl: 0 8px 32px rgba(0,0,0,0.12);
  --transition: all 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 740px; margin: 0 auto; padding: 0 24px; }

/* === HEADER === */
.site-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  color: var(--white);
  padding: 48px 0 40px;
  position: relative;
  overflow: hidden;
}
.site-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.site-header::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.site-header .container { position: relative; z-index: 1; text-align: center; }
.site-header h1 { font-size: 2.4em; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 10px; }
.site-header .subtitle { font-size: 1.05em; opacity: 0.8; max-width: 560px; margin: 0 auto; line-height: 1.6; }

/* === NAV === */
.site-nav {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.95);
}
.site-nav .container { display: flex; gap: 0; overflow-x: auto; }
.site-nav a {
  padding: 14px 20px;
  text-decoration: none;
  color: var(--gray-500);
  font-size: 0.9em;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}
.site-nav a:hover { color: var(--primary); }
.site-nav a.active { color: var(--primary); border-bottom-color: var(--primary); }

/* === HEADER SMALL (article/ category pages) === */
.header-small { padding: 24px 0 20px; }
.header-small h1 { font-size: 1.4em; margin-bottom: 4px; }
.header-small .subtitle { font-size: 0.9em; }
.header-small .back-link { 
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--gray-400); text-decoration: none; font-size: 0.85em;
  margin-bottom: 12px; transition: var(--transition);
}
.header-small .back-link:hover { color: var(--primary); }

/* === SECTIONS === */
.section { padding: 40px 0; }
.section-white { background: var(--white); }
.section-title {
  font-size: 1.35em;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--gray-900);
}

/* === CARDS === */
.card-grid { display: grid; gap: 20px; }
.card-grid-3 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.card-grid-2 { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }

.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.card-featured {
  border: 2px solid var(--primary);
  background: linear-gradient(135deg, var(--primary-light), var(--white));
  position: relative;
}
.card-featured::after {
  content: '🔥 推荐';
  position: absolute;
  top: -1px;
  right: 24px;
  background: var(--primary);
  color: var(--white);
  padding: 3px 12px;
  border-radius: 0 0 8px 8px;
  font-size: 0.75em;
  font-weight: 600;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75em;
  font-weight: 600;
  margin-bottom: 10px;
}
.tag-review { background: #dbeafe; color: #1d4ed8; }
.tag-tutorial { background: #dcfce7; color: #15803d; }
.tag-compare { background: #fef3c7; color: #b45309; }
.tag-news { background: #f3e8ff; color: #7c3aed; }

.card h3 { font-size: 1.05em; margin-bottom: 8px; line-height: 1.5; }
.card h3 a { color: var(--gray-900); text-decoration: none; transition: var(--transition); }
.card h3 a:hover { color: var(--primary); }
.card p { color: var(--gray-500); font-size: 0.9em; margin-bottom: 16px; line-height: 1.6; }
.card .meta { display: flex; justify-content: space-between; font-size: 0.8em; color: var(--gray-400); }

/* === RANKING === */
.rank-card { display: flex; align-items: center; gap: 16px; }
.rank-number {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1em; font-weight: 800; flex-shrink: 0;
}
.rank-1 { background: linear-gradient(135deg, #f59e0b, #d97706); color: #fff; box-shadow: 0 2px 8px rgba(245,158,11,0.3); }
.rank-2 { background: linear-gradient(135deg, #94a3b8, #64748b); color: #fff; }
.rank-3 { background: linear-gradient(135deg, #92400e, #78350f); color: #fff; }
.rank-info { flex: 1; }
.rank-info h3 { font-size: 1em; margin-bottom: 4px; }
.rank-info p { font-size: 0.85em; color: var(--gray-500); margin-bottom: 0; }

.rating-bar {
  display: inline-block;
  height: 6px;
  border-radius: 3px;
  background: var(--gray-200);
  width: 120px;
  vertical-align: middle;
  margin-left: 8px;
}
.rating-bar-fill { height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--primary), #6366f1); }

/* === ARTICLE === */
.article {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px;
  margin: 24px 24px 40px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
}
.article h1 { font-size: 1.8em; margin-bottom: 16px; line-height: 1.4; font-weight: 800; letter-spacing: -0.01em; }
.article h2 {
  font-size: 1.3em; margin: 36px 0 16px; padding-bottom: 10px;
  border-bottom: 2px solid var(--gray-100); color: var(--gray-800);
}
.article h3 { font-size: 1.1em; margin: 24px 0 12px; color: var(--gray-700); }
.article p { margin-bottom: 16px; color: var(--gray-600); line-height: 1.8; }
.article p strong { color: var(--gray-900); }
.article a { color: var(--primary); }
.article code {
  background: var(--gray-100); padding: 2px 6px; border-radius: 4px;
  font-size: 0.88em; color: #1d4ed8; font-family: 'SF Mono', 'Fira Code', monospace;
}
.article pre {
  background: #0f172a; color: #e2e8f0; padding: 20px; border-radius: var(--radius-sm);
  overflow-x: auto; margin: 16px 0; font-size: 0.82em; line-height: 1.7;
  border: 1px solid #1e293b;
}
.article pre code { background: transparent; color: #e2e8f0; padding: 0; }
.article blockquote {
  border-left: 4px solid var(--primary);
  padding: 16px 20px; margin: 16px 0;
  background: var(--primary-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--gray-600);
}
.article hr { border: none; border-top: 1px solid var(--gray-200); margin: 32px 0; }
.article li { margin-bottom: 8px; padding-left: 4px; color: var(--gray-600); }
.article table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.9em; }
.article td, .article th { border: 1px solid var(--gray-200); padding: 10px 14px; text-align: left; }
.article th { background: var(--gray-50); font-weight: 600; color: var(--gray-700); }
.article img { max-width: 100%; border-radius: var(--radius-sm); margin: 16px 0; }
.article-meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  padding-bottom: 16px; margin-bottom: 24px;
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.85em; color: var(--gray-400);
}

/* === LIST PAGE === */
.list-page { padding: 24px; }
.list-card { 
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--white); border-radius: var(--radius);
  padding: 20px 24px; margin-bottom: 16px;
  border: 1px solid var(--gray-200); transition: var(--transition);
}
.list-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.list-card-content { flex: 1; }
.list-card-content h3 { font-size: 1em; margin-bottom: 6px; }
.list-card-content h3 a { color: var(--gray-900); text-decoration: none; }
.list-card-content h3 a:hover { color: var(--primary); }
.list-card-content p { font-size: 0.85em; color: var(--gray-500); margin-bottom: 0; }
.list-card .meta { font-size: 0.78em; color: var(--gray-400); margin-top: 8px; }
.list-card-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3em; flex-shrink: 0;
}
.icon-review { background: #dbeafe; }
.icon-tutorial { background: #dcfce7; }
.icon-compare { background: #fef3c7; }

/* === PLACEHOLDER === */
.placeholder {
  text-align: center; padding: 60px 24px; color: var(--gray-400);
}
.placeholder-icon { font-size: 3em; margin-bottom: 16px; }
.placeholder p { font-size: 1em; }

/* === FOOTER === */
.site-footer {
  background: var(--dark-2); color: var(--gray-400);
  padding: 40px 0; text-align: center; font-size: 0.85em;
  margin-top: 40px;
}
.site-footer a { color: var(--primary); text-decoration: none; }

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .site-header h1 { font-size: 1.6em; }
  .site-header { padding: 32px 0 28px; }
  .article { padding: 20px; margin: 12px; }
  .article h1 { font-size: 1.3em; }
  .card-grid-3 { grid-template-columns: 1fr; }
  .card-grid-2 { grid-template-columns: 1fr; }
  .section { padding: 24px 0; }
  .list-card { flex-direction: column; gap: 12px; }
  .rank-card { flex-wrap: wrap; }
}

@media (min-width: 768px) {
  .article { margin: 24px auto 40px; }
}