/* CedarPond AI Feed — Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #FAFAFA;
  --bg-card: #FFFFFF;
  --text: #1A1A2E;
  --text-secondary: #64748B;
  --accent: #2563EB;
  --accent-green: #059669;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1200px;
  --tag-bg: #EFF6FF;
  --tag-text: #2563EB;
  --score-fill: #2563EB;
  --score-empty: #E2E8F0;
  --hero-bg: linear-gradient(135deg, #059669 0%, #2563EB 100%);
  --quote-bg: #F8FAFC;
  --quote-border: #059669;
}

[data-theme="dark"] {
  --bg: #0F172A;
  --bg-card: #1E293B;
  --text: #E2E8F0;
  --text-secondary: #94A3B8;
  --border: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.4);
  --tag-bg: #1E3A5F;
  --tag-text: #60A5FA;
  --score-empty: #334155;
  --quote-bg: #1E293B;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

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

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.site-logo:hover { text-decoration: none; }
.site-logo svg { width: 32px; height: 32px; }

.header-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.header-nav a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.header-nav a:hover, .header-nav a.active {
  background: var(--tag-bg);
  color: var(--accent);
  text-decoration: none;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text);
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); }

/* Hero */
.hero {
  background: var(--hero-bg);
  padding: 48px 0;
  margin-bottom: 40px;
  color: white;
}

.hero h1 { font-size: 2rem; font-weight: 700; margin-bottom: 8px; }
.hero p { font-size: 1.1rem; opacity: 0.9; }

/* Sections */
.section { margin-bottom: 48px; }
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}
.section-title { font-size: 1.35rem; font-weight: 700; }
.section-link { font-size: 0.875rem; font-weight: 500; }

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }

.card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
  background: var(--tag-bg);
  color: var(--tag-text);
}
.tag-category {
  background: var(--accent);
  color: white;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}
.card-title a { color: var(--text); }
.card-title a:hover { color: var(--accent); text-decoration: none; }

.card-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  flex-grow: 1;
  line-height: 1.5;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.card-meta-left { display: flex; align-items: center; gap: 8px; }
.card-links { display: flex; gap: 12px; }
.card-links a { font-weight: 500; font-size: 0.8rem; }

/* Score bar */
.score-bar {
  display: inline-flex;
  gap: 2px;
  align-items: center;
}
.score-bar .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--score-empty);
}
.score-bar .dot.filled { background: var(--score-fill); }
.score-label { margin-left: 4px; font-weight: 600; }

/* Post page */
.post-page { max-width: 800px; margin: 40px auto; padding: 0 24px; }
.back-link { display: inline-block; margin-bottom: 24px; font-weight: 500; }

.post-header { margin-bottom: 32px; }
.post-title { font-size: 1.75rem; font-weight: 700; margin-bottom: 16px; line-height: 1.3; }
.post-summary { font-size: 1.05rem; line-height: 1.7; color: var(--text); margin-bottom: 24px; }

.original-content {
  background: var(--quote-bg);
  border-left: 4px solid var(--quote-border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px;
  margin: 24px 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}
.original-content-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.post-metadata {
  margin: 32px 0;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.post-metadata dl { display: grid; grid-template-columns: 120px 1fr; gap: 8px 16px; }
.post-metadata dt { font-weight: 600; font-size: 0.85rem; color: var(--text-secondary); }
.post-metadata dd { font-size: 0.9rem; }

.related-posts { margin-top: 48px; }

/* Weekly page */
.weekly-page { max-width: 900px; margin: 40px auto; padding: 0 24px; }
.weekly-header { margin-bottom: 32px; }
.weekly-title { font-size: 1.75rem; font-weight: 700; margin-bottom: 8px; }
.weekly-dates { color: var(--text-secondary); font-size: 1rem; }
.weekly-summary { font-size: 1.05rem; line-height: 1.7; margin-bottom: 32px; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.stat-value { font-size: 1.75rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.8rem; color: var(--text-secondary); margin-top: 4px; }

/* Weekly archive */
.weekly-list { list-style: none; }
.weekly-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.weekly-list a { font-weight: 600; font-size: 1.05rem; }
.weekly-list .meta { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 64px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.footer-links { display: flex; justify-content: center; gap: 24px; margin-top: 8px; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
}
.empty-state p { font-size: 1.1rem; }

/* Responsive */
@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.5rem; }
  .header-inner { flex-direction: column; align-items: flex-start; }
  .post-title { font-size: 1.35rem; }
  .post-metadata dl { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .card { padding: 16px; }
  .stats-grid { grid-template-columns: 1fr; }
}