:root, [data-theme="dark"] {
  --bg: #09090b;
  --bg-alt: #111113;
  --bg-card: #18181b;
  --border: #27272a;
  --text: #e4e4e7;
  --text-dim: #71717a;
  --accent: #22d3ee;
  --accent2: #2dd4bf;
  --purple: #c084fc;
  --orange: #fb923c;
  --radius: 8px;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f5f5f5;
  --bg-card: #ffffff;
  --border: #e5e5e5;
  --text: #1a1a1a;
  --text-dim: #888888;
  --accent: #0891b2;
  --accent2: #0d9488;
  --purple: #7c3aed;
  --orange: #d97706;
}

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

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

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

::selection { background: var(--accent); color: #000; }

.container { max-width: 720px; margin: 0 auto; padding: 0 20px; }

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0 20px;
  margin-bottom: 40px;
}

nav .logo { font-size: 1rem; font-weight: 500; color: var(--text-dim); }
nav .logo a { color: var(--accent); font-weight: 600; }
nav .logo a:hover { color: var(--accent2); }

nav .nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

nav .nav-links a {
  color: var(--text-dim);
  font-size: 0.85rem;
  transition: color 0.15s;
}

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

.hero { margin-bottom: 32px; }

.hero .tagline {
  color: var(--text-dim);
  font-size: 0.92rem;
  max-width: 580px;
  line-height: 1.6;
}

.search-box { margin-bottom: 24px; }

.search-box input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.88rem;
  font-family: inherit;
  outline: none;
  transition: border 0.15s;
}

.search-box input:focus { border-color: var(--accent); }
.search-box input::placeholder { color: var(--text-dim); }

.filters {
  display: flex;
  gap: 6px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 4px 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-btn:hover { border-color: var(--accent); color: var(--accent); }

.filter-btn.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.posts-list { display: flex; flex-direction: column; margin-bottom: 48px; }

.post-card {
  display: block;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  transition: opacity 0.15s;
}

.post-card:hover { opacity: 0.8; }

.post-card:last-child { border-bottom: none; }

.post-card .post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.post-card .post-meta .category {
  color: var(--accent2);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.post-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.4;
  color: var(--text);
}

.post-card p {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.6;
}

.post-card .post-tags {
  display: flex;
  gap: 4px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.post-card .post-tags .tag {
  font-size: 0.68rem;
  color: var(--purple);
  padding: 1px 8px;
  border-radius: 3px;
  background: rgba(192, 132, 252, 0.06);
}

footer {
  padding: 24px 0 32px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.78rem;
}

footer a { color: var(--accent); }
footer a:hover { text-decoration: underline; }

/* Post page */
.post-header { margin-bottom: 28px; }

.post-header .back-link {
  display: inline-block;
  color: var(--text-dim);
  font-size: 0.82rem;
  margin-bottom: 20px;
  transition: color 0.15s;
}

.post-header .back-link:hover { color: var(--accent); }

.post-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
}

.post-header .meta {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 0.8rem;
  flex-wrap: wrap;
}

.post-header .meta .cat {
  color: var(--accent2);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.post-content { font-size: 0.92rem; line-height: 1.8; }

.post-content h1 { font-size: 1.4rem; margin: 32px 0 14px; color: var(--accent); }
.post-content h2 { font-size: 1.2rem; margin: 28px 0 12px; color: var(--accent2); }
.post-content h3 { font-size: 1.05rem; margin: 24px 0 10px; }
.post-content h4 { font-size: 0.95rem; margin: 20px 0 8px; }

.post-content p { margin-bottom: 16px; }

.post-content ul, .post-content ol { margin: 12px 0 16px 20px; }
.post-content li { margin-bottom: 4px; }

.post-content code {
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.85em;
  color: var(--orange);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

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

.post-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 0.8rem;
  line-height: 1.6;
}

.post-content img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 20px 0;
}

.post-content blockquote {
  border-left: 2px solid var(--accent);
  padding: 8px 16px;
  margin: 20px 0;
  color: var(--text-dim);
  font-style: italic;
}

.post-content blockquote p { margin: 0; }

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

.post-content strong { color: var(--text); }

.post-content a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.post-content a:hover { color: var(--accent2); }

.post-footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); }

.post-footer .tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.post-footer .tags .tag {
  color: var(--purple);
  padding: 3px 10px;
  border-radius: 3px;
  font-size: 0.78rem;
  background: rgba(192, 132, 252, 0.06);
}

/* About */
.about-content { max-width: 640px; }

.about-content h1 { font-size: 1.5rem; margin-bottom: 20px; color: var(--accent); }
.about-content h2 { font-size: 1.1rem; margin: 28px 0 12px; color: var(--accent2); }

.about-content p { margin-bottom: 16px; font-size: 0.92rem; line-height: 1.8; }

.about-content ul { margin: 12px 0 20px 20px; }
.about-content li { margin-bottom: 6px; color: var(--text-dim); }
.about-content li::before { content: '> '; color: var(--accent); font-weight: 700; }

.social-links {
  display: flex;
  gap: 10px;
  margin: 20px 0;
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  padding: 8px 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.82rem;
  transition: all 0.15s;
}

.social-links a:hover { border-color: var(--accent); color: var(--accent); }

/* 404 */
.error-page { text-align: center; padding: 80px 0; }

.error-page .glitch {
  font-size: 5rem;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 2px 0 var(--accent2), -2px 0 var(--purple);
  margin-bottom: 8px;
}

.error-page p { color: var(--text-dim); margin-bottom: 20px; }

.error-page a {
  display: inline-block;
  padding: 10px 24px;
  background: var(--accent);
  color: #000;
  border-radius: var(--radius);
  font-weight: 500;
}

.error-page a:hover { background: var(--accent2); }

/* Theme button */
.theme-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.75rem;
  font-family: inherit;
  padding: 3px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.theme-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Landing modal */
.landing-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(8px);
}

.landing-modal.show { display: flex; }

.landing-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
  max-width: 480px;
  width: 90%;
  text-align: center;
}

.landing-box h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.landing-box p {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 28px;
}

.landing-choices {
  display: flex;
  gap: 12px;
}

.landing-card {
  flex: 1;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 16px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  font-family: inherit;
  color: var(--text);
}

.landing-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.landing-card .lc-icon {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.landing-card .lc-title {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.landing-card .lc-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.4;
}

@media (max-width: 600px) {
  .container { padding: 0 16px; }
  nav { flex-direction: column; gap: 12px; align-items: flex-start; }
  nav .nav-links { gap: 16px; }
  .post-header h1 { font-size: 1.3rem; }
}