/* ══════════════════════════════════════════════════════════════
   GH Trend Digest — Dark theme inspired by Linear
   ══════════════════════════════════════════════════════════════ */

/* ── Reset & Variables ─────────────────────────────────────── */

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

:root {
  /* Backgrounds */
  --bg-root:     #08090a;
  --bg-panel:    #0f1011;
  --bg-surface:  #191a1b;
  --bg-elevated: #232427;
  --bg-hover:    rgba(255, 255, 255, 0.04);

  /* Text */
  --text-primary:   #f7f8f8;
  --text-secondary: #c0c6d0;
  --text-tertiary:  #8a8f98;
  --text-quaternary:#62666d;

  /* Accent */
  --accent:         #7170ff;
  --accent-dim:     #5e6ad2;
  --accent-hover:   #828fff;

  /* Borders */
  --border-subtle:  rgba(255, 255, 255, 0.05);
  --border-standard:rgba(255, 255, 255, 0.08);
  --border-strong:  rgba(255, 255, 255, 0.12);

  /* Misc */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-pill: 9999px;

  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;

  --max-width: 720px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--bg-root);
  color: var(--text-secondary);
  font-family: var(--font-sans);
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-hover); }

/* ── Navigation ────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 9, 10, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.15px;
}
.logo:hover { color: var(--text-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.13px;
}
.nav-link:hover { color: var(--text-primary); }

.nav-count {
  color: var(--text-quaternary);
  font-size: 12px;
  font-weight: 500;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

/* ── Hero ──────────────────────────────────────────────────── */

.hero {
  padding: 48px 24px 40px;
  text-align: center;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-tertiary);
  max-width: 480px;
  margin: 0 auto 24px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-num {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 13px;
  color: var(--text-quaternary);
  font-weight: 500;
}

/* ── Content ───────────────────────────────────────────────── */

.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-quaternary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

/* ── Loading ───────────────────────────────────────────────── */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 80px 0;
  color: var(--text-quaternary);
}

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-standard);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Post List ─────────────────────────────────────────────── */

.post-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.post-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.post-card:hover {
  background: var(--bg-hover);
  border-color: var(--border-standard);
}

.post-card-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.post-card-date {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.15px;
}

.post-card-meta {
  font-size: 13px;
  color: var(--text-quaternary);
  display: flex;
  gap: 12px;
}

.post-card-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.post-card-repo {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.post-card-stars {
  font-size: 12px;
  color: var(--text-quaternary);
}

/* ── Post Detail ───────────────────────────────────────────── */

.post-detail {
  padding-top: 16px;
}

.post-detail.hidden {
  display: none;
}

.detail-header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 32px;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
  margin-bottom: 16px;
}
.btn-back:hover {
  background: var(--bg-hover);
  border-color: var(--border-standard);
  color: var(--text-primary);
}

.detail-date {
  font-size: 14px;
  color: var(--text-quaternary);
  font-weight: 500;
  margin-bottom: 8px;
}

.detail-content {
  line-height: 1.75;
  color: var(--text-secondary);
}

/* Blog content styles */
.detail-content h1 {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 24px;
}

.detail-content h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 40px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.detail-content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 10px;
}

.detail-content p {
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.75;
}

.detail-content a {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid var(--accent-dim);
  padding-bottom: 1px;
}
.detail-content a:hover {
  color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.detail-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.detail-content blockquote {
  border-left: 2px solid var(--accent-dim);
  padding: 4px 0 4px 16px;
  margin: 20px 0;
  color: var(--text-tertiary);
  font-style: italic;
}

.detail-content hr {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 32px 0;
}

.detail-content code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: rgba(255,255,255,0.06);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--accent-hover);
}

.detail-content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border-standard);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 20px 0;
}

.detail-content pre code {
  background: none;
  padding: 0;
  color: var(--text-secondary);
}

.detail-content ul, .detail-content ol {
  padding-left: 20px;
  margin: 16px 0;
}

.detail-content li {
  margin-bottom: 8px;
  font-size: 15px;
}

.detail-content img {
  max-width: 100%;
  border-radius: var(--radius-lg);
}

.detail-content em {
  color: var(--text-tertiary);
}

/* ── Empty / Error States ──────────────────────────────────── */

.empty-state, .error-state {
  text-align: center;
  padding: 80px 24px;
}

.empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state h2, .error-state h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-state p, .error-state p {
  color: var(--text-quaternary);
  font-size: 15px;
}

/* ── Footer ────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 32px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer p {
  font-size: 13px;
  color: var(--text-quaternary);
  line-height: 1.8;
}

.footer a {
  color: var(--text-tertiary);
}
.footer a:hover {
  color: var(--text-primary);
}

.footer-meta {
  margin-top: 4px;
  font-style: italic;
}

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 640px) {
  .hero {
    padding: 32px 24px 32px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-num {
    font-size: 22px;
  }

  .post-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .post-card-right {
    align-items: flex-start;
  }

  .post-card-repo {
    max-width: 100%;
  }

  .detail-content h1 {
    font-size: 22px;
  }
}

/* ── Animations ────────────────────────────────────────────── */

.fade-in {
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Selection */
::selection {
  background: rgba(113, 112, 255, 0.3);
  color: var(--text-primary);
}