:root {
  --bg: #0b0d14;
  --bg-elevated: #12151f;
  --border: #232838;
  --text: #e6e8ef;
  --text-muted: #9aa0b4;
  --accent-1: #7c5cff;
  --accent-2: #22d3ee;
  --accent-3: #ff6ec7;
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, .logo-text {
  font-family: "Space Grotesk", "Inter", sans-serif;
  letter-spacing: -0.01em;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(11, 13, 20, 0.85);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

.main-nav {
  display: flex;
  gap: 24px;
}

.main-nav a {
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.15s ease;
}

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

/* Hero */
.hero {
  padding: 80px 0 50px;
  text-align: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--accent-2);
  font-weight: 600;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 18px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2) 50%, var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Featured */
.featured {
  margin-bottom: 40px;
}

.featured-card {
  display: block;
  border-radius: var(--radius);
  padding: 36px;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.15), rgba(34, 211, 238, 0.1));
  border: 1px solid var(--border);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.featured-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-1);
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-2);
  margin-bottom: 12px;
}

.featured-content h2 {
  font-size: 1.8rem;
  margin: 0 0 12px;
}

.featured-content p {
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 0 16px;
}

.read-more {
  font-weight: 600;
  color: var(--accent-1);
}

/* Tags filter */
.tags-filter {
  margin-bottom: 40px;
}

.tags-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-pill {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.tag-pill:hover {
  border-color: var(--accent-1);
  color: var(--text);
}

.tag-pill.active {
  background: var(--accent-1);
  border-color: var(--accent-1);
  color: #fff;
}

.tag-pill.small {
  padding: 3px 10px;
  font-size: 0.72rem;
  pointer-events: none;
}

/* Post grid */
.section-title {
  font-size: 1.4rem;
  margin: 0 0 24px;
}

.post-grid-section, .related-section {
  padding-bottom: 80px;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-2);
}

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

.post-card h3 {
  font-size: 1.15rem;
  margin: 0;
}

.post-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0;
  flex-grow: 1;
}

.post-card-meta {
  display: flex;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.empty-state {
  color: var(--text-muted);
  text-align: center;
  padding: 40px 0;
}

/* Post detail */
.post-detail {
  padding: 50px 0 30px;
}

.post-detail-inner {
  max-width: 720px;
}

.back-link {
  display: inline-block;
  color: var(--text-muted);
  margin-bottom: 24px;
  font-weight: 500;
}

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

.post-detail-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.post-detail h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0 0 16px;
}

.post-detail-meta {
  display: flex;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.post-detail-content {
  font-size: 1.05rem;
  color: #d3d6e0;
}

.post-detail-content p {
  margin: 0 0 20px;
}

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

.post-detail-content ol, .post-detail-content ul {
  padding-left: 22px;
  margin: 0 0 20px;
}

.post-detail-content li {
  margin-bottom: 10px;
}

.related-section {
  border-top: 1px solid var(--border);
  padding-top: 50px;
  margin-top: 20px;
}

/* 404 */
.not-found {
  padding: 100px 0;
  text-align: center;
}

.not-found h1 {
  font-size: 1.6rem;
  max-width: 480px;
  margin: 0 auto 24px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: auto;
  padding: 30px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-note {
  color: #565c72;
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}