:root {
  --bg-color: #0d1117;
  --surface: #161b22;
  --border-color: #30363d;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent-color: #58a6ff;
  --link-color: #58a6ff;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  line-height: 1.65;
  min-height: 100vh;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  border-bottom: 1px solid var(--border-color);
  padding: 24px 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.blog-brand {
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--text-primary);
}

/* Main */
.main {
  padding: 50px 20px 80px;
}

.intro-section {
  margin-bottom: 36px;
}

.page-heading {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
  color: #fff;
}

.page-subheading {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Tag Bar */
.tag-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.tag-item {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tag-item:hover, .tag-item.active {
  background: rgba(88, 166, 255, 0.15);
  color: var(--accent-color);
  border-color: rgba(88, 166, 255, 0.3);
}

/* Posts List */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.post-item {
  display: flex;
  flex-direction: column;
  transition: opacity 0.2s ease;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.meta-dot {
  opacity: 0.5;
}

.post-tag {
  color: var(--accent-color);
  font-weight: 600;
}

.post-title {
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.post-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.post-title a:hover {
  color: var(--accent-color);
}

.post-excerpt {
  color: var(--text-secondary);
  font-family: 'Newsreader', Georgia, serif;
  font-size: 1.12rem;
  line-height: 1.6;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 30px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

@media (max-width: 600px) {
  .page-heading { font-size: 1.8rem; }
  .post-title { font-size: 1.25rem; }
  .footer-container { flex-direction: column; gap: 12px; text-align: center; }
}