/* ===== DESIGN TOKENS ===== */
:root[data-theme="dark"] {
  --bg-primary: #080b12;
  --bg-secondary: #0c1019;
  --bg-card: #111827;
  --bg-card-hover: #172033;
  --border: #1e2d42;
  --border-accent: #00e5c0;
  --text-primary: #e8edf5;
  --text-secondary: #7d8fa8;
  --text-muted: #4a5d76;
  --accent: #00e5c0;
  --accent-secondary: #3d6fff;
  --accent-dim: rgba(0, 229, 192, 0.08);
  --accent-blue-dim: rgba(61, 111, 255, 0.08);
  --nav-bg: rgba(8, 11, 18, 0.9);
  --input-bg: #0c1019;
  --tag-bg: #111827;
  --tag-text: #7d8fa8;
  --hero-label: #00e5c0;
  --stat-color: #00e5c0;
  --glow-sm: 0 0 20px rgba(0,229,192,0.06);
  --scanline: rgba(0,229,192,0.03);
  --grid-line: rgba(0,229,192,0.04);
  --heading-color: #e8edf5;
  --heading-sub-color: #c8d0e0;
}
:root[data-theme="light"] {
  --bg-primary: #e8ecf2;
  --bg-secondary: #dfe4ed;
  --bg-card: #f0f3f8;
  --bg-card-hover: #e4e8f0;
  --border: #c5ccd8;
  --border-accent: #5A55F4;
  --text-primary: #1e2152;
  --text-secondary: #3a3f6e;
  --text-muted: #6b7194;
  --accent: #5A55F4;
  --accent-secondary: #6E69F7;
  --accent-dim: rgba(90, 85, 244, 0.08);
  --accent-blue-dim: rgba(90, 85, 244, 0.06);
  --nav-bg: rgba(232, 236, 242, 0.94);
  --input-bg: #f0f3f8;
  --tag-bg: #dfe4ed;
  --tag-text: #3a3f6e;
  --hero-label: #5A55F4;
  --stat-color: #1e2152;
  --glow-sm: 0 0 16px rgba(90,85,244,0.06);
  --scanline: transparent;
  --grid-line: rgba(90,85,244,0.03);
  --heading-color: #1e2152;
  --heading-sub-color: #2a2d5e;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary); color: var(--text-primary);
  line-height: 1.6; transition: background 0.3s, color 0.3s; overflow-x: hidden;
}
body::before {
  content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: repeating-linear-gradient(0deg, var(--scanline) 0px, var(--scanline) 1px, transparent 1px, transparent 4px),
    repeating-linear-gradient(90deg, var(--grid-line) 0px, var(--grid-line) 1px, transparent 1px, transparent 80px);
  opacity: 0.5;
}
body > * { position: relative; z-index: 1; }

.mono { font-family: 'JetBrains Mono', monospace; }
.label-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--hero-label);
}
h1, h2, h3, h4 { font-weight: 700; line-height: 1.12; letter-spacing: -0.025em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); color: var(--heading-color); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); color: var(--heading-color); }
h3 { font-size: 1.15rem; font-weight: 600; color: var(--heading-sub-color); }
h4 { color: var(--heading-sub-color); }
[data-theme="light"] h1,
[data-theme="light"] h2 { color: #1e2152 !important; }
[data-theme="light"] h3,
[data-theme="light"] h4 { color: #2a2d5e !important; }

p { color: var(--text-secondary); }
a { color: inherit; text-decoration: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
section { padding: 72px 0; }

/* NAV */
nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: var(--nav-bg); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.nav-logo svg { height: 28px; width: auto; display: block; }
.nav-links { display: flex; align-items: center; gap: 24px; list-style: none; }
.nav-links a { font-family: 'JetBrains Mono', monospace; font-size: 0.75rem; color: var(--text-muted); transition: color 0.2s; letter-spacing: 0.02em; }
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--text-primary); }
.nav-actions { display: flex; align-items: center; gap: 10px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 20px; font-size: 0.82rem; font-weight: 600;
  border-radius: 3px; cursor: pointer; transition: all 0.2s;
  border: none; letter-spacing: 0.01em; font-family: 'JetBrains Mono', monospace;
}
.btn-primary { background: var(--accent); color: #080b12; }
[data-theme="light"] .btn-primary { background: #5A55F4; color: #fff; }
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--text-primary); background: var(--accent-dim); }

.theme-toggle {
  width: 34px; height: 34px; display: flex; align-items: center; justify-content: center;
  border-radius: 3px; border: 1px solid var(--border); background: transparent;
  cursor: pointer; color: var(--text-muted); font-size: 0.95rem; transition: all 0.2s;
}
.theme-toggle:hover { background: var(--accent-dim); color: var(--text-primary); }

/* FOOTER */
footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; }
.footer-logo svg { height: 22px; width: auto; }
.footer-copy { font-size: 0.75rem; color: var(--text-muted); }

.section-header { margin-bottom: 40px; }
.section-header h2 { margin-top: 10px; }
.section-header p { margin-top: 10px; font-size: 0.92rem; }

/* PAGE HERO (for subpages) */
.page-hero { padding-top: 110px; padding-bottom: 48px; }
.page-hero h1 { margin-bottom: 16px; }
.page-hero p { max-width: 560px; font-size: 1rem; line-height: 1.65; }

/* CARD GRID (reusable) */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
  padding: 24px; transition: all 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--glow-sm); }
[data-theme="light"] .card:hover { border-color: #5A55F4; }
.card-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.64rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 8px;
}
[data-theme="light"] .card-tag { color: #5A55F4; }
.card-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text-primary); }
.card-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }
.card-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; color: var(--text-muted); margin-top: 12px; padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* FAQ STYLES */
.faq-list { max-width: 740px; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 0; cursor: pointer; font-size: 0.95rem; font-weight: 600;
  color: var(--text-primary); transition: color 0.2s;
}
.faq-question:hover { color: var(--accent); }
[data-theme="light"] .faq-question:hover { color: #5A55F4; }
.faq-toggle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem; color: var(--text-muted); flex-shrink: 0; transition: transform 0.3s;
}
.faq-item.open .faq-toggle { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 400px; padding-bottom: 20px; }

/* VIDEO CARD */
.video-thumb {
  width: 100%; aspect-ratio: 16/9; background: var(--bg-secondary); border-radius: 4px;
  margin-bottom: 14px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); overflow: hidden;
}
.play-icon {
  width: 48px; height: 48px; border-radius: 50%; background: var(--accent-dim);
  border: 2px solid var(--accent); display: flex; align-items: center; justify-content: center;
  color: var(--accent); font-size: 1.1rem;
}
[data-theme="light"] .play-icon { border-color: #5A55F4; color: #5A55F4; }

/* DEMO */
.demo-embed {
  width: 100%; aspect-ratio: 16/9; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 6px; display: flex; align-items: center; justify-content: center; margin-top: 32px;
}
.demo-placeholder {
  text-align: center; color: var(--text-muted); font-size: 0.9rem;
}
.demo-placeholder .mono { font-size: 0.78rem; margin-top: 8px; }

/* ARTICLE PROSE */
.article-prose { max-width: 680px; }
.article-prose .article-back {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem; color: var(--text-muted); text-decoration: none; display: inline-block;
  margin-bottom: 24px; transition: color 0.2s;
}
.article-prose .article-back:hover { color: var(--text-primary); }
.article-prose .prose-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.64rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px; display: block;
}
[data-theme="light"] .article-prose .prose-tag { color: #5A55F4; }
.article-prose h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 16px; line-height: 1.15; color: var(--heading-color); }
.article-prose .prose-meta {
  font-size: 0.82rem; color: var(--text-muted); margin-bottom: 36px; padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.article-prose p { font-size: 1rem; color: var(--text-primary); line-height: 1.8; margin-bottom: 20px; opacity: 0.92; }
[data-theme="light"] .article-prose p { color: #2a2d5e; opacity: 1; }
.article-prose h2, .article-prose h3 { margin-top: 36px; margin-bottom: 14px; color: var(--accent); }
[data-theme="light"] .article-prose h2, [data-theme="light"] .article-prose h3 { color: #1e2152 !important; }
.article-prose h2 { font-size: 1.4rem; }
.article-prose h3 { font-size: 1.15rem; }
.article-prose h4 { font-size: 1rem; margin-top: 24px; margin-bottom: 10px; color: var(--accent); }
[data-theme="light"] .article-prose h4 { color: #2a2d5e !important; }
.article-prose ul, .article-prose ol { margin-bottom: 20px; padding-left: 24px; }
.article-prose li { font-size: 0.95rem; color: var(--text-primary); line-height: 1.75; margin-bottom: 8px; opacity: 0.92; }
[data-theme="light"] .article-prose li { color: #2a2d5e; opacity: 1; }
.article-prose strong { color: #fff; }
[data-theme="light"] .article-prose strong { color: #1e2152; }
.article-prose blockquote {
  border-left: 2px solid var(--accent); padding: 12px 0 12px 20px; margin: 24px 0;
  font-size: 1.05rem; color: var(--text-primary); font-weight: 500; line-height: 1.6;
}
[data-theme="light"] .article-prose blockquote { border-left-color: #5A55F4; }
.article-prose img { width: 100%; border-radius: 6px; margin: 24px 0; border: 1px solid var(--border); }
.article-prose .prose-author {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border);
  font-size: 0.85rem; color: var(--text-muted);
}
.article-prose .prose-author strong { color: var(--text-primary); font-weight: 600; }

/* MOBILE */
@media (max-width: 900px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-links.mobile-open { display: flex; flex-direction: column; position: absolute; top: 56px; left: 0; right: 0; background: var(--nav-bg); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); padding: 16px 24px; gap: 16px; z-index: 99; }
  .hamburger { display: flex; flex-direction: column; gap: 4px; cursor: pointer; padding: 8px; border: none; background: none; }
  .hamburger span { display: block; width: 20px; height: 2px; background: var(--text-primary); border-radius: 1px; transition: all 0.2s; }
  .hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }
  .footer-inner { flex-wrap: wrap; gap: 12px; justify-content: center; text-align: center; }
}
@media (min-width: 901px) {
  .hamburger { display: none; }
}
@media (max-width: 600px) {
  .card-grid { grid-template-columns: 1fr; }
  h1 { font-size: clamp(1.5rem, 8vw, 1.8rem); }
}