/* ============================================
   Block Curious — Crypto Education Blog
   Dark theme with purple/orange accents
   ============================================ */

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

:root {
  --bg-primary: #0a0c10;
  --bg-card: #12141c;
  --bg-card-hover: #181b26;
  --bg-code: #1a1d27;
  --bg-input: #1a1d27;
  --text-primary: #e8eaed;
  --text-secondary: #9ca3af;
  --text-dim: #6b7280;
  --accent-purple: #6c5ce7;
  --accent-purple-light: #a29bfe;
  --accent-orange: #f7931a;
  --accent-orange-light: #fdba74;
  --accent-gradient: linear-gradient(135deg, #6c5ce7, #f7931a);
  --border: #1e2130;
  --border-light: #2a2d3e;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1120px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-purple-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-orange); }

img { max-width: 100%; height: auto; display: block; }

code, pre {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

/* --- Layout --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- Header / Nav --- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }

.nav-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; }

/* --- Hero --- */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero h1 .gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 32px;
  line-height: 1.65;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-purple);
  color: #fff;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(108, 92, 231, 0.35);
  color: #fff;
}

/* --- Post Grid --- */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
  letter-spacing: -0.5px;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 64px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-purple);
  box-shadow: 0 12px 40px rgba(108, 92, 231, 0.12);
}

.post-card-thumb {
  height: 180px;
  background: var(--bg-code);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.post-card-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(247,147,26,0.1));
}

.post-card-body { padding: 24px; }

.post-card-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-orange);
  margin-bottom: 10px;
}

.post-card-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.35;
  letter-spacing: -0.3px;
}

.post-card-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --- Affiliate Banner --- */
.affiliate-banner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin: 48px 0;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.affiliate-banner .af-text { flex: 1; min-width: 240px; }
.affiliate-banner h4 { font-size: 1.1rem; margin-bottom: 6px; }
.affiliate-banner p { font-size: 0.9rem; color: var(--text-secondary); }

.af-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-orange);
  color: #000;
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform var(--transition);
  white-space: nowrap;
}
.af-cta:hover { transform: translateY(-2px); color: #000; }

/* --- Subscribe --- */
.subscribe-section {
  background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(247,147,26,0.06));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  margin: 64px 0;
}

.subscribe-section h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.subscribe-section p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 440px;
  margin-left: auto;
  margin-right: auto;
}

.subscribe-form {
  display: flex;
  gap: 12px;
  max-width: 440px;
  margin: 0 auto;
}

.subscribe-form input {
  flex: 1;
  padding: 14px 18px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: 50px;
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition);
}
.subscribe-form input::placeholder { color: var(--text-dim); }
.subscribe-form input:focus { border-color: var(--accent-purple); }

.subscribe-form button {
  padding: 14px 28px;
  background: var(--accent-purple);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}
.subscribe-form button:hover { background: #5a4bd6; }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-inner p { color: var(--text-dim); font-size: 0.85rem; }
.footer-links { display: flex; gap: 20px; list-style: none; }
.footer-links a { color: var(--text-dim); font-size: 0.85rem; }
.footer-links a:hover { color: var(--text-secondary); }

/* ===== Article Page ===== */
.article-header {
  padding: 64px 0 32px;
  max-width: 740px;
  margin: 0 auto;
}

.article-header .back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 24px;
}
.article-header .back-link:hover { color: var(--accent-purple-light); }

.article-header .tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-orange);
  margin-bottom: 12px;
}

.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 20px;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.article-content {
  max-width: 740px;
  margin: 0 auto;
  padding-bottom: 64px;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 48px 0 16px;
  letter-spacing: -0.3px;
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 36px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
  color: var(--text-secondary);
}

.article-content li { margin-bottom: 8px; line-height: 1.7; }

.article-content blockquote {
  border-left: 3px solid var(--accent-purple);
  padding: 16px 24px;
  margin: 24px 0;
  background: rgba(108, 92, 231, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-content pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 24px 0;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
  color: #c8ccd4;
}

.article-content code {
  background: var(--bg-code);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--accent-purple-light);
}

.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-content .info-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-purple);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 24px 0;
}

.article-content .info-box h4 {
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: var(--accent-purple-light);
}

.article-content .info-box p { margin-bottom: 0; }

.article-content .key-takeaway {
  background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(247,147,26,0.06));
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

.article-content .key-takeaway h4 {
  font-size: 0.95rem;
  margin-bottom: 12px;
  color: var(--accent-orange);
}

/* --- Article Nav --- */
.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 32px 0;
  border-top: 1px solid var(--border);
  max-width: 740px;
  margin: 0 auto;
}

.article-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  flex: 1;
  transition: border-color var(--transition);
}
.article-nav a:hover { border-color: var(--accent-purple); }
.article-nav a .label { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }
.article-nav a .title { font-size: 0.95rem; font-weight: 600; }
.article-nav .next { text-align: right; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 12, 16, 0.97);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }
  .nav-toggle { display: block; }
  .hero { padding: 48px 0 40px; }
  .post-grid { grid-template-columns: 1fr; }
  .affiliate-banner { flex-direction: column; text-align: center; }
  .subscribe-form { flex-direction: column; }
  .subscribe-section { padding: 32px 20px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .article-header { padding: 40px 0 24px; }
  .article-nav { flex-direction: column; }
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  .container { padding: 0 16px; }
  .nav-inner { padding: 0 16px; }
}