/* ===== RESET & VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f17;
  --bg2: #16162a;
  --surface: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.08);
  --text: #e2e8f0;
  --text2: #94a3b8;
  --text3: #475569;
  --accent: #8b5cf6;
  --accent2: #06b6d4;
  --green: #10b981;
  --yellow: #f59e0b;
  --red: #ef4444;
  --sans: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max: 740px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }

/* ===== NAV ===== */
nav {
  position: sticky;
  top: 0; z-index: 50;
  background: rgba(15,15,23,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-brand span { color: var(--accent); }
.nav-links { display: flex; gap: 0.1rem; }
.nav-links a {
  color: var(--text2);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  transition: all 0.15s;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }

/* ===== HOME PAGE ===== */
.home-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4rem 1.5rem 2.5rem;
  border-bottom: 1px solid var(--border);
}
.home-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.8rem;
  color: #f1f5f9;
}
.home-sub {
  font-size: 1rem;
  color: var(--text2);
  max-width: 500px;
  line-height: 1.65;
}
.home-meta {
  margin-top: 1.2rem;
  display: flex;
  gap: 1.5rem;
  font-size: 0.78rem;
  color: var(--text3);
  font-family: var(--mono);
}
.home-meta a { color: var(--accent); text-decoration: none; }
.home-meta a:hover { text-decoration: underline; }

/* ===== POST LISTING ===== */
.posts-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}
.posts-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  font-family: var(--mono);
  margin-bottom: 1.5rem;
}
.post-card {
  display: block;
  text-decoration: none;
  padding: 1.4rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 1rem;
  background: var(--surface);
  transition: all 0.2s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
}
.post-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
}
.post-card:hover { border-color: rgba(139,92,246,0.3); transform: translateX(3px); }
.post-card:hover::before { opacity: 1; }
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}
.post-date {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text3);
}
.post-tags { display: flex; gap: 0.4rem; }
.tag {
  font-size: 0.65rem;
  font-weight: 600;
  font-family: var(--mono);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.tag-ml  { background: rgba(139,92,246,0.15); color: #a78bfa; }
.tag-era { background: rgba(6,182,212,0.12); color: #67e8f9; }
.tag-viz { background: rgba(16,185,129,0.12); color: #6ee7b7; }
.post-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 0.4rem;
  letter-spacing: -0.015em;
}
.post-card-desc {
  font-size: 0.85rem;
  color: var(--text2);
  line-height: 1.55;
}
.post-card-arrow {
  position: absolute;
  right: 1.25rem; top: 50%;
  transform: translateY(-50%);
  color: var(--text3);
  font-size: 1rem;
  transition: all 0.2s;
}
.post-card:hover .post-card-arrow { color: var(--accent); transform: translateY(-50%) translateX(3px); }

/* ===== BLOG POST PAGE ===== */
.post-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}
.post-header { margin-bottom: 3rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border); }
.post-header .post-tags { margin-bottom: 1rem; }
.post-heading {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: #f1f5f9;
  margin-bottom: 1rem;
}
.post-header-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.78rem;
  color: var(--text3);
  font-family: var(--mono);
  flex-wrap: wrap;
}
.post-header-meta span { display: flex; align-items: center; gap: 0.4rem; }
.post-lede {
  margin-top: 1.2rem;
  font-size: 1.05rem;
  color: var(--text2);
  line-height: 1.75;
  border-left: 3px solid var(--accent);
  padding-left: 1.2rem;
  font-style: italic;
}

/* ===== PROSE ===== */
.prose { font-size: 0.97rem; color: var(--text); }
.prose h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 3rem 0 1rem;
  color: #f1f5f9;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
  color: var(--text);
}
.prose p { margin-bottom: 1.2rem; line-height: 1.8; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: #a78bfa; }
.prose strong { color: #f1f5f9; font-weight: 600; }
.prose em { color: var(--text2); font-style: italic; }
.prose ul, .prose ol { margin: 0.8rem 0 1.2rem 1.4rem; }
.prose li { margin-bottom: 0.4rem; line-height: 1.7; color: var(--text2); }
.prose li strong { color: var(--text); }

/* ===== CODE ===== */
.prose code {
  font-family: var(--mono);
  font-size: 0.83em;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  color: #c084fc;
}
.prose pre {
  background: #1a1a2e;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin: 1.2rem 0;
  position: relative;
}
.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.83rem;
  color: #e2e8f0;
  line-height: 1.7;
}

/* ===== EXPERIMENT CARDS ===== */
.exp-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  margin: 2.5rem 0;
  background: rgba(255,255,255,0.02);
}
.exp-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.4rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.exp-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(139,92,246,0.12);
  border: 1px solid rgba(139,92,246,0.25);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.exp-card-title { font-size: 0.95rem; font-weight: 700; color: var(--text); }
.exp-body { padding: 1.4rem; }
.exp-body p { font-size: 0.9rem; margin-bottom: 0.8rem; line-height: 1.75; }
.exp-body p:last-child { margin-bottom: 0; }

/* ===== CLAIM / RESULT / INSIGHT BOXES ===== */
.box {
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  margin: 1rem 0;
  font-size: 0.88rem;
  line-height: 1.65;
}
.box-claim {
  background: rgba(139,92,246,0.08);
  border-left: 3px solid var(--accent);
  color: var(--text2);
}
.box-claim strong { color: var(--text); }
.box-result {
  background: rgba(16,185,129,0.08);
  border-left: 3px solid var(--green);
  color: var(--text2);
}
.box-result strong { color: #6ee7b7; }
.box-insight {
  background: rgba(245,158,11,0.08);
  border-left: 3px solid var(--yellow);
  color: var(--text2);
}
.box-insight strong { color: #fcd34d; }

/* ===== STAT PILLS ===== */
.stat-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}
.stat-pill {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
}
.stat-pill-label { font-size: 0.62rem; font-family: var(--mono); color: var(--text3); text-transform: uppercase; letter-spacing: 0.08em; }
.stat-pill-val { font-size: 1rem; font-weight: 700; font-family: var(--mono); }

/* ===== LIVE DEMO BUTTON ===== */
.demo-btn-wrap { margin: 1.5rem 0; text-align: center; }
.demo-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: white;
  text-decoration: none;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.2s;
  letter-spacing: 0.01em;
}
.demo-btn:hover { background: #7c3aed; transform: translateY(-1px); box-shadow: 0 4px 20px rgba(139,92,246,0.4); }
.demo-btn-icon { font-size: 1rem; }

/* ===== MATRIX PROOF ===== */
.matrix-proof {
  background: #1a1a2e;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  margin: 1rem 0;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text2);
  overflow-x: auto;
}
.matrix-proof .eq { color: var(--accent); font-weight: 600; font-size: 0.95rem; }
.matrix-proof .note { display: block; margin-top: 0.6rem; font-size: 0.72rem; color: var(--text3); }

/* ===== SECTION DIVIDER ===== */
.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
}
.footer-inner { max-width: var(--max); margin: 0 auto; }
.footer-inner p { font-size: 0.78rem; color: var(--text3); }
.footer-inner a { color: var(--text2); text-decoration: none; }
.footer-inner a:hover { color: var(--text); }

/* ===== ANIMATIONS ===== */
@keyframes fadeUp { from { opacity:0; transform:translateY(16px); } to { opacity:1; transform:translateY(0); } }
.prose, .post-header, .home-hero { animation: fadeUp 0.5s ease both; }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .post-header-meta { gap: 0.75rem; }
  .nav-links a { padding: 0.3rem 0.5rem; font-size: 0.78rem; }
  .post-wrap { padding: 2rem 1rem 4rem; }
  .home-hero { padding: 2.5rem 1rem 2rem; }
  .posts-section { padding: 1.5rem 1rem; }
}