:root {
  --primary: #6366f1;
  --accent: #22d3ee;
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --radius: 12px;
  --content-width: 760px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 24px 20px 80px;
}

.back {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}
.back:hover { color: var(--accent); }

.ai-end {
  display: block;
  margin: 28px 0 0 auto;   /* right-aligned, end of the article */
  width: 110px;
  height: auto;
  opacity: 0.85;
}

.lang-switch {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.lang-switch a {
  color: var(--accent);
  text-decoration: none;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 0.8rem;
}
.lang-switch a:hover { background: color-mix(in srgb, var(--primary) 25%, transparent); }

.cover-wrap {
  position: relative;
  margin: 0 0 24px;
}
.cover-wrap .cover {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
}

.ai-footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
}
.ai-footer img {
  width: 110px;
  height: auto;
  display: block;
  margin-left: auto;
  opacity: 0.85;
}

.blog-index .hero {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius);
  padding: 44px 40px;
  margin-bottom: 8px;
  color: #fff;
  box-shadow: 0 14px 34px color-mix(in srgb, var(--primary) 35%, transparent);
}
.blog-index .hero h1 { margin: 0 0 6px; font-size: 2.2rem; line-height: 1.2; }
.blog-index .hero .subtitle { opacity: 0.85; margin: 0; }

.month-group { margin-top: 36px; }
.month-group h2 {
  font-size: 1.05rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
  padding-bottom: 8px;
  margin: 0 0 18px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}
.card {
  display: block;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--muted) 20%, transparent);
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
}
.card .thumb { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; }
.card .card-body { padding: 14px 16px 16px; }
.card .date { color: var(--muted); font-size: 0.78rem; }
.card h3 { margin: 6px 0 8px; font-size: 1rem; line-height: 1.4; color: var(--text); }
.card:hover h3 { color: var(--accent); }

.badge {
  font-size: 0.7rem;
  border-radius: 999px;
  padding: 1px 8px;
  color: var(--bg);
  background: var(--accent);
}
.badge.draft { background: var(--muted); }
.badge.needs_review { background: #f59e0b; }
.badge.ready { background: #10b981; }

article.post {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px 36px;
}

.post .cover {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 0 0 24px;
}

.post h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 8px; }
.post .meta { color: var(--muted); font-size: 0.9rem; margin-bottom: 24px; }
.post .meta .tag {
  display: inline-block;
  background: color-mix(in srgb, var(--primary) 25%, transparent);
  color: var(--accent);
  border-radius: 999px;
  padding: 2px 10px;
  margin-right: 6px;
  font-size: 0.8rem;
}

.post h2 { font-size: 1.45rem; margin-top: 1.8em; }
.post h3 { font-size: 1.15rem; margin-top: 1.4em; }
.post a { color: var(--accent); }
.post code {
  background: color-mix(in srgb, var(--bg) 60%, transparent);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}
.post pre {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
}
.post pre code { background: none; padding: 0; }
.code-block { position: relative; }
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-family: inherit;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s ease;
}
.copy-btn:hover { opacity: 1; }
.post blockquote {
  margin: 0;
  padding: 4px 20px;
  border-left: 4px solid var(--primary);
  color: var(--muted);
}
.post table { border-collapse: collapse; width: 100%; margin: 16px 0; }
.post th, .post td { border: 1px solid color-mix(in srgb, var(--muted) 30%, transparent); padding: 8px 12px; text-align: left; }
.post th { background: color-mix(in srgb, var(--primary) 15%, transparent); }

.post-footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
  color: var(--muted);
  font-size: 0.9rem;
}
.post-footer a { color: var(--accent); }