/* AI Builders 日报样式 */
@import url('https://fonts.googleapis.com/css2?family=Long+Cang&family=ZCOOL+KuaiLe&family=Noto+Sans+SC:wght@300;400;500;700;900&family=Ma+Shan+Zheng&family=JetBrains+Mono:wght@400;500&display=swap');
:root {
  --bg-main: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #1a1a25;
  --bg-section: #0e0e16;
  --accent-primary: #6366f1;
  --accent-primary-light: rgba(99,102,241,0.12);
  --accent-cyan: #06b6d4;
  --accent-cyan-light: rgba(6,182,212,0.12);
  --accent-amber: #f59e0b;
  --accent-amber-light: rgba(245,158,11,0.12);
  --accent-green: #22c55e;
  --accent-green-light: rgba(34,197,94,0.12);
  --accent-rose: #f43f5e;
  --accent-rose-light: rgba(244,63,94,0.12);
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-light: #71717a;
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', -apple-system, sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  padding-top: 64px;
}

a { color: inherit; text-decoration: none; }

/* ========== NAV ========== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.nav-logo img { width: 28px; height: 28px; border-radius: 50%; }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a {
  color: var(--text-light); font-size: 0.9rem; transition: var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }

/* ========== HERO ========== */
.hero {
  max-width: 960px; margin: 0 auto;
  padding: 48px 24px 24px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 20px;
  background: var(--accent-primary-light);
  color: var(--accent-primary); font-size: 0.82rem; font-weight: 500;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 2rem; font-weight: 800; line-height: 1.3;
  background: linear-gradient(135deg, #e4e4e7 0%, #6366f1 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-meta {
  margin-top: 12px; display: flex; gap: 16px; flex-wrap: wrap;
  color: var(--text-light); font-size: 0.88rem;
}
.hero-meta span { display: flex; align-items: center; gap: 4px; }

/* ========== DATE NAV ========== */
.date-nav {
  max-width: 960px; margin: 0 auto;
  padding: 0 24px 20px;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.date-btn {
  padding: 7px 16px; border-radius: 20px; border: 1px solid var(--border);
  background: transparent; color: var(--text-secondary);
  font-size: 0.85rem; cursor: pointer; transition: var(--transition);
  font-family: inherit;
}
.date-btn:hover { border-color: var(--border-hover); color: var(--text-primary); }
.date-btn.active {
  background: var(--accent-primary); color: #fff; border-color: var(--accent-primary);
}

/* ========== CONTENT ========== */
.content {
  max-width: 960px; margin: 0 auto;
  padding: 0 24px 80px;
}

/* Section */
.section { margin-bottom: 40px; }
.section-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 20px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.section-icon {
  width: 36px; height: 36px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.section-icon.twitter { background: var(--accent-cyan-light); }
.section-icon.podcast { background: var(--accent-amber-light); }
.section-title { font-size: 1.1rem; font-weight: 700; }
.section-count {
  margin-left: auto; font-size: 0.8rem; color: var(--text-light);
  padding: 3px 10px; border-radius: 12px; background: var(--bg-card);
}

/* Builder Card */
.builder-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  transition: var(--transition);
}
.builder-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}
.builder-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 12px;
}
.builder-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem; color: #fff;
  flex-shrink: 0;
}
.builder-info { flex: 1; min-width: 0; }
.builder-name { font-weight: 600; font-size: 0.95rem; }
.builder-bio {
  font-size: 0.82rem; color: var(--text-light);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.builder-handle {
  font-size: 0.8rem; color: var(--accent-cyan);
  font-family: 'JetBrains Mono', monospace;
}

/* Tweet */
.tweet { margin-bottom: 14px; }
.tweet:last-child { margin-bottom: 0; }
.tweet-text {
  font-size: 0.92rem; line-height: 1.75; color: var(--text-primary);
  margin-bottom: 8px;
}
.tweet-meta {
  display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
}
.tweet-link {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 0.78rem; color: var(--accent-cyan);
  font-family: 'JetBrains Mono', monospace;
  transition: var(--transition);
}
.tweet-link:hover { color: var(--accent-primary); }
.tweet-stats {
  font-size: 0.75rem; color: var(--text-light);
  display: flex; gap: 10px;
}
.tweet-stats span { display: flex; align-items: center; gap: 3px; }

/* Podcast Card */
.podcast-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 16px;
  transition: var(--transition);
}
.podcast-card:hover {
  border-color: var(--border-hover);
}
.podcast-header {
  display: flex; align-items: flex-start; gap: 14px;
  margin-bottom: 16px;
}
.podcast-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--accent-amber-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; flex-shrink: 0;
}
.podcast-show { font-size: 0.82rem; color: var(--accent-amber); font-weight: 500; }
.podcast-title { font-weight: 700; font-size: 1.05rem; margin-top: 4px; line-height: 1.5; }
.podcast-url {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 0.78rem; color: var(--accent-amber);
  font-family: 'JetBrains Mono', monospace;
  margin-top: 8px;
}

.podcast-summary {
  font-size: 0.92rem; line-height: 1.85; color: var(--text-secondary);
  white-space: pre-line;
}
.podcast-summary p { margin-bottom: 12px; }
.podcast-summary strong { color: var(--text-primary); }

/* ========== LOADING / ERROR ========== */
.loading, .error-box {
  text-align: center; padding: 80px 24px;
}
.loading-icon { font-size: 3rem; margin-bottom: 16px; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
.error-box h2 { font-size: 1.3rem; margin-bottom: 8px; }
.error-box p { color: var(--text-light); }

/* ========== FOOTER ========== */
.footer {
  text-align: center; padding: 40px 24px;
  color: var(--text-light); font-size: 0.82rem;
  border-top: 1px solid var(--border);
  max-width: 960px; margin: 0 auto;
}
.footer a { color: var(--accent-primary); transition: var(--transition); }
.footer a:hover { color: var(--accent-cyan); }

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  body { padding-top: 56px; }
  .hero h1 { font-size: 1.5rem; }
  .builder-card, .podcast-card { padding: 18px; }
  .nav-links { gap: 14px; }
  .date-nav { gap: 6px; }
  .date-btn { padding: 6px 12px; font-size: 0.8rem; }
}

/* ========== HIGHLIGHTS ========== */
.highlights-list {
  display: flex; flex-direction: column; gap: 10px;
}
.highlight-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border);
  font-size: 0.9rem; line-height: 1.6; color: var(--text-secondary);
  transition: var(--transition);
}
.highlight-item:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}
.highlight-item.hot {
  background: var(--accent-rose-light);
  border-color: rgba(244,63,94,0.15);
  color: var(--text-primary);
  font-weight: 500;
}
.highlight-dot {
  flex-shrink: 0; font-size: 0.9rem; margin-top: 2px;
}

/* Tweet hot indicator */
.tweet.hot {
  padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--accent-primary-light);
  border-left: 3px solid var(--accent-primary);
}
.tweet.hot .tweet-text.cn {
  font-weight: 500;
}

/* English original text - muted */
.tweet-text.en {
  color: var(--text-light);
  font-size: 0.85rem;
  padding: 6px 0 2px 12px;
  border-left: 2px solid var(--border);
  margin-top: 6px;
}