/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a0b;
  --bg-card: #121213;
  --bg-hover: #1a1a1c;
  --border: #1f1f23;
  --text: #e8e8ed;
  --text-secondary: #888899;
  --text-tertiary: #555566;
  --accent: #6366f1;
  --accent-subtle: #818cf8;
  --cyan: #06b6d4;
  --green: #22c55e;
  --orange: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1100px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Navigation */
.nav {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(12px);
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.3px;
}

.logo img {
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

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

/* Sections */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 24px;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 32px;
}

/* Hero */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 96px 24px 80px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--accent-subtle);
  border: 1px solid rgba(99, 102, 241, 0.2);
  background: rgba(99, 102, 241, 0.06);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.15s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-subtle);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--text-tertiary);
}

/* Feature Card */
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--text-tertiary);
}

.feature-card .card-tag.featured {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.card-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: transparent;
  margin-right: 6px;
}

.card-time {
  font-size: 11px;
  color: var(--text-tertiary);
  font-weight: 500;
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  margin-top: 14px;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

h2.card-title {
  font-size: 24px;
}

.card-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.card-meta {
  font-size: 12px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-dot {
  font-size: 10px;
}

.card-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-subtle);
}

.card-link:hover {
  color: var(--accent);
}

.arrow {
  transition: transform 0.15s;
  display: inline-block;
}

.card-link:hover .arrow {
  transform: translateX(4px);
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

/* Articles List */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--border);
}

.article-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 24px 32px;
  background: var(--bg-card);
  transition: background 0.15s;
}

.article-row:hover {
  background: var(--bg-hover);
}

.article-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 4px;
  letter-spacing: -0.2px;
}

.article-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.article-content .card-meta {
  font-size: 11px;
}

/* Trending */
.trending-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.trending-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
  cursor: default;
}

.trending-card:hover {
  border-color: var(--text-tertiary);
}

.trending-card h3 {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}

/* Topics */
.topics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.15s;
}

.topic-card:hover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.03);
}

.topic-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.topic-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Newsletter */
.newsletter-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.newsletter-card h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.newsletter-card > p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 28px;
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 420px;
  margin: 0 auto;
}

.newsletter-form input {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

.newsletter-form input:focus {
  border-color: var(--accent);
}

.newsletter-form button {
  margin-top: 4px;
}

.newsletter-note {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 16px;
  line-height: 1.5;
}

/* Library */
.library-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.library-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}

.library-card:hover {
  border-color: var(--text-tertiary);
}

.library-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-top: 12px;
  margin-bottom: 8px;
  line-height: 1.3;
}

.library-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Builder Kit */
.builder-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.builder-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}

.builder-card:hover {
  border-color: var(--text-tertiary);
}

.builder-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.builder-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

/* Membership */
.membership-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(6, 182, 212, 0.04));
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
}

.membership-card h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.membership-card > p {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 28px;
  line-height: 1.6;
}

.membership-features {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
}

.membership-features li {
  font-size: 13px;
  color: var(--text);
  background: rgba(99, 102, 241, 0.06);
  border: 1px solid rgba(99, 102, 241, 0.1);
  padding: 6px 14px;
  border-radius: 100px;
}

.membership-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: color 0.15s;
}

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

.footer-copy {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 64px 24px 48px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .article-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px 24px;
  }

  .trending-grid {
    grid-template-columns: 1fr;
  }

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .library-grid {
    grid-template-columns: 1fr;
  }

  .builder-grid {
    grid-template-columns: 1fr;
  }

  .newsletter-card {
    padding: 32px 24px;
  }

  .membership-card {
    padding: 32px 24px;
  }

  .membership-features {
    flex-direction: column;
    align-items: center;
  }

  .section {
    padding: 48px 24px;
  }

  .nav-links {
    display: none;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .topics-grid,
  .builder-grid {
    grid-template-columns: 1fr 1fr;
  }
}