/* ═══════════════════════════════════════════════════════════════════
   SANSQRIT — Global Design System
   Aesthetic: Cosmic Brutalism — deep space meets quantum precision
   Fonts: Bebas Neue (display) + Space Mono (code) + Syne (body)
═══════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Space+Mono:ital,wght@0,400;0,700;1,400&family=Syne:wght@400;500;600;700;800&display=swap');

:root {
  /* Core palette */
  --void:     #000000;
  --deep:     #030610;
  --abyss:    #060d1f;
  --shell:    #0a1628;
  --surface:  #0e1e35;
  --lift:     #132540;

  /* Quantum spectrum */
  --cyan:     #00e5ff;
  --teal:     #00b4d8;
  --blue:     #0077b6;
  --indigo:   #023e8a;
  --glow:     #00ffcc;
  --pulse:    #7df9ff;
  --hot:      #00fff5;
  --dim-cyan: rgba(0,229,255,0.12);

  /* Text */
  --text-1:   #f0f8ff;
  --text-2:   #8ab4c4;
  --text-3:   #4a7a8a;
  --text-code:#7df9ff;

  /* UI */
  --border:   rgba(0,229,255,0.15);
  --border-h: rgba(0,229,255,0.4);
  --glass:    rgba(6,13,31,0.7);
  --glass-h:  rgba(10,22,40,0.9);

  /* Type scale */
  --font-display: 'Bebas Neue', cursive;
  --font-body:    'Syne', sans-serif;
  --font-code:    'Space Mono', monospace;

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:   cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--void);
  color: var(--text-1);
  line-height: 1.6;
  overflow-x: hidden;
  cursor: crosshair;
}

/* ── Custom cursor ─────────────────────────────────────────────── */
.cursor-dot {
  position: fixed; top: 0; left: 0; z-index: 9999;
  width: 8px; height: 8px;
  background: var(--cyan);
  border-radius: 50%;
  pointer-events: none;
  mix-blend-mode: screen;
  transition: transform 0.1s var(--ease-out-expo);
  box-shadow: 0 0 20px var(--cyan), 0 0 40px rgba(0,229,255,0.4);
}
.cursor-ring {
  position: fixed; top: 0; left: 0; z-index: 9998;
  width: 36px; height: 36px;
  border: 1px solid rgba(0,229,255,0.5);
  border-radius: 50%;
  pointer-events: none;
  transition: transform 0.25s var(--ease-out-expo), opacity 0.2s;
}

/* ── Navigation ─────────────────────────────────────────────────── */
nav.site-nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 20px 48px;
  display: flex; align-items: center; justify-content: space-between;
  background: linear-gradient(to bottom, rgba(0,0,0,0.95) 0%, transparent 100%);
  backdrop-filter: blur(0);
  transition: background 0.3s, backdrop-filter 0.3s;
}
nav.site-nav.scrolled {
  background: rgba(3,6,16,0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 4px;
  color: var(--cyan);
  text-decoration: none;
  text-shadow: 0 0 30px rgba(0,229,255,0.6);
  position: relative;
}
.nav-logo::after {
  content: 'QUANTUM DSL';
  position: absolute; bottom: -10px; left: 0;
  font-family: var(--font-code);
  font-size: 8px;
  letter-spacing: 3px;
  color: var(--teal);
  opacity: 0.7;
}

.nav-links {
  display: flex; align-items: center; gap: 32px;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-code);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute; bottom: -3px; left: 0; right: 0;
  height: 1px; background: var(--cyan);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s var(--ease-out-expo);
}
.nav-links a:hover { color: var(--cyan); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--cyan); }

.nav-cta {
  font-family: var(--font-code);
  font-size: 11px;
  letter-spacing: 2px;
  padding: 8px 20px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  text-decoration: none;
  text-transform: uppercase;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.nav-cta::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--cyan);
  transform: translateX(-100%);
  transition: transform 0.3s var(--ease-out-expo);
  z-index: -1;
}
.nav-cta:hover { color: var(--void); }
.nav-cta:hover::before { transform: translateX(0); }

/* ── Page wrapper for interior pages ──────────────────────────── */
.page-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  padding-top: 80px;
}

/* ── Sidebar TOC ────────────────────────────────────────────────── */
.sidebar-toc {
  position: sticky; top: 80px;
  height: calc(100vh - 80px);
  overflow-y: auto;
  padding: 40px 24px 40px 48px;
  border-right: 1px solid var(--border);
}
.sidebar-toc::-webkit-scrollbar { width: 3px; }
.sidebar-toc::-webkit-scrollbar-thumb { background: var(--border); }

.toc-title {
  font-family: var(--font-code);
  font-size: 9px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.toc-section { margin-bottom: 6px; }
.toc-section > a {
  display: block;
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--text-2);
  text-decoration: none;
  padding: 6px 0;
  border-left: 2px solid transparent;
  padding-left: 12px;
  transition: all 0.2s;
}
.toc-section > a:hover, .toc-section > a.active {
  color: var(--cyan);
  border-left-color: var(--cyan);
}
.toc-subsections { padding-left: 16px; }
.toc-subsections a {
  display: block;
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--text-3);
  text-decoration: none;
  padding: 3px 0;
  transition: color 0.2s;
}
.toc-subsections a:hover { color: var(--teal); }

/* ── Main content ────────────────────────────────────────────────── */
.page-content {
  padding: 60px 80px 120px;
  max-width: 900px;
}
.page-content-full { padding: 60px 80px 120px; }

/* ── Typography ─────────────────────────────────────────────────── */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(80px, 12vw, 160px);
  letter-spacing: 8px;
  line-height: 0.9;
  color: var(--text-1);
}
.display-lg {
  font-family: var(--font-display);
  font-size: clamp(48px, 7vw, 96px);
  letter-spacing: 4px;
  line-height: 1;
}
.display-md {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 56px);
  letter-spacing: 3px;
}
h1.page-title {
  font-family: var(--font-display);
  font-size: 56px;
  letter-spacing: 4px;
  color: var(--text-1);
  margin-bottom: 8px;
}
h2.section-title {
  font-family: var(--font-display);
  font-size: 36px;
  letter-spacing: 2px;
  color: var(--cyan);
  margin: 60px 0 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
h3.sub-title {
  font-family: var(--font-body);
  font-size: 20px;
  font-weight: 700;
  color: var(--teal);
  margin: 36px 0 12px;
}
h4.mini-title {
  font-family: var(--font-code);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-2);
  margin: 24px 0 8px;
}
p { color: var(--text-2); margin-bottom: 16px; font-size: 15px; }
p.lead { font-size: 18px; color: var(--text-1); line-height: 1.7; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Code blocks ─────────────────────────────────────────────────── */
code {
  font-family: var(--font-code);
  font-size: 0.875em;
  background: var(--dim-cyan);
  color: var(--text-code);
  padding: 2px 6px;
  border: 1px solid var(--border);
}

pre {
  font-family: var(--font-code);
  font-size: 13px;
  background: var(--abyss);
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  padding: 24px 28px;
  overflow-x: auto;
  line-height: 1.7;
  margin: 20px 0;
  position: relative;
}
pre::before {
  content: attr(data-lang);
  position: absolute; top: 8px; right: 12px;
  font-size: 9px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--text-3);
}
pre code { background: none; border: none; padding: 0; color: var(--text-code); font-size: inherit; }

/* Syntax highlighting */
.kw  { color: #ff79c6; }
.fn  { color: var(--glow); }
.str { color: #f1fa8c; }
.num { color: #bd93f9; }
.cmt { color: var(--text-3); font-style: italic; }
.op  { color: var(--cyan); }
.ty  { color: #ffb86c; }

/* ── Cards ────────────────────────────────────────────────────────── */
.card {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 28px;
  transition: all 0.3s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0; transition: opacity 0.3s;
}
.card:hover { border-color: var(--border-h); background: var(--glass-h); transform: translateY(-2px); }
.card:hover::before { opacity: 1; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

/* ── Stat blocks ─────────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin: 32px 0;
}
.stat-block {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 24px;
  text-align: center;
}
.stat-number {
  font-family: var(--font-display);
  font-size: 48px;
  letter-spacing: 2px;
  color: var(--cyan);
  line-height: 1;
  text-shadow: 0 0 30px rgba(0,229,255,0.4);
}
.stat-label {
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-top: 6px;
}

/* ── Tags ──────────────────────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--text-2);
  margin: 3px;
}
.tag.quantum   { border-color: #7C3AED; color: #a78bfa; }
.tag.chemistry { border-color: #059669; color: #34d399; }
.tag.rust      { border-color: #F46623; color: #fdba74; }
.tag.python    { border-color: #3b82f6; color: #93c5fd; }
.tag.hot       { border-color: var(--cyan); color: var(--cyan); }

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-code);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 12px 28px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  background: transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.25s var(--ease-out-expo);
  position: relative; overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--cyan);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s var(--ease-out-expo);
  z-index: 0;
}
.btn span { position: relative; z-index: 1; }
.btn:hover { color: var(--void); text-decoration: none; }
.btn:hover::before { transform: scaleX(1); }

.btn-ghost {
  border-color: var(--border);
  color: var(--text-2);
}
.btn-ghost::before { background: var(--surface); }
.btn-ghost:hover { color: var(--text-1); }

.btn-lg { padding: 16px 40px; font-size: 13px; }

/* ── Table ────────────────────────────────────────────────────────── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 13px;
}
th {
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(0,229,255,0.06);
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: 14px;
}
td code { font-size: 12px; }
tr:hover td { background: rgba(0,229,255,0.03); }

/* ── Progress / comparison bars ─────────────────────────────────── */
.perf-bar-wrap { margin: 12px 0; }
.perf-bar-label {
  display: flex; justify-content: space-between;
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--text-2);
  margin-bottom: 6px;
}
.perf-bar {
  height: 6px; background: var(--surface);
  position: relative; overflow: hidden;
}
.perf-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  box-shadow: 0 0 12px rgba(0,229,255,0.5);
  transition: width 1.5s var(--ease-out-expo);
  width: 0;
}
.perf-bar-fill.rust  { background: linear-gradient(90deg, #B7410E, #F46623); box-shadow: 0 0 12px rgba(244,102,35,0.5); }
.perf-bar-fill.py    { background: linear-gradient(90deg, #1e3a5f, #3b82f6); }
.perf-bar-fill.js    { background: linear-gradient(90deg, #92400e, #F7DF1E); }

/* ── Callout boxes ──────────────────────────────────────────────── */
.callout {
  padding: 20px 24px;
  border-left: 3px solid;
  margin: 24px 0;
  background: rgba(0,0,0,0.3);
  font-size: 14px;
}
.callout.info    { border-color: var(--cyan);    color: var(--text-2); }
.callout.warning { border-color: #F59E0B; color: #fcd34d; }
.callout.tip     { border-color: #10B981; color: #6ee7b7; }
.callout.danger  { border-color: #EF4444; color: #fca5a5; }
.callout-title   { font-family: var(--font-code); font-size: 10px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px; opacity: 0.7; }

/* ── Section divider ────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
  position: relative;
}
.divider::after {
  content: '◆';
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  background: var(--void);
  padding: 0 12px;
  color: var(--border);
  font-size: 10px;
}

/* ── Footer ──────────────────────────────────────────────────────── */
footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 60px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand .logo {
  font-family: var(--font-display);
  font-size: 32px;
  letter-spacing: 4px;
  color: var(--cyan);
}
.footer-brand p { font-size: 13px; margin-top: 12px; color: var(--text-3); }
.footer-col h4 {
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-3);
  text-decoration: none;
  padding: 4px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 80px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--text-3);
}

/* ── Scroll reveal ───────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}
.reveal.visible { opacity: 1; transform: none; }



/* ── Interactive diagram widgets ───────────────────────────────── */
.diagram-shell {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 20px;
  background:
    radial-gradient(circle at top, rgba(0,229,255,0.08), transparent 36%),
    linear-gradient(180deg, rgba(5,10,20,0.98), rgba(2,4,10,0.98));
  overflow: hidden;
  margin: 20px 0 28px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.35);
}
.diagram-shell::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.85), transparent 92%);
  pointer-events: none;
}
.diagram-shell-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 18px 10px;
}
.diagram-kicker {
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--cyan);
}
.diagram-subtitle {
  margin-top: 6px;
  color: var(--text-3);
  font-size: 13px;
  max-width: 620px;
}
.diagram-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}
.diagram-btn {
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  background: rgba(255,255,255,0.02);
  color: var(--text-2);
  border: 1px solid rgba(0,229,255,0.18);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.diagram-btn:hover {
  color: var(--cyan);
  border-color: rgba(0,229,255,0.45);
  transform: translateY(-1px);
}
.diagram-btn-wide { padding-inline: 16px; }
.diagram-legend {
  position: relative;
  z-index: 2;
  padding: 0 18px 14px;
  color: var(--text-3);
  font-family: var(--font-code);
  font-size: 10px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
}
.diagram-viewport {
  position: relative;
  height: calc(100% - 92px);
  overflow: hidden;
}
.diagram-stage {
  position: absolute;
  inset: 0;
  transform-origin: 0 0;
}
.diagram-svg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.diagram-flow-path {
  fill: none;
  animation: dashFlow 4s linear infinite;
}
.diagram-node {
  position: absolute;
  text-align: left;
  border-radius: 18px;
  border: 1px solid rgba(148,163,184,0.22);
  padding: 16px 16px 14px;
  background: linear-gradient(180deg, rgba(8,14,29,0.96), rgba(5,8,16,0.94));
  color: var(--text-1);
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.diagram-node:hover,
.diagram-node.active {
  transform: translateY(-2px);
}
.diagram-node-top {
  display: flex;
  gap: 10px;
  align-items: baseline;
  justify-content: space-between;
}
.diagram-node-title {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 1px;
  line-height: 1.04;
}
.diagram-node-badge {
  font-family: var(--font-code);
  font-size: 9px;
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0.9;
  white-space: nowrap;
}
.diagram-node-subtitle {
  font-family: var(--font-code);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--text-3);
}
.diagram-node-body {
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-wrap: pretty;
}
.diagram-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}
.diagram-chip {
  display: inline-flex;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  color: var(--text-3);
  font-family: var(--font-code);
  font-size: 9px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.diagram-tooltip,
.diagram-detail-panel {
  position: absolute;
  z-index: 3;
  border: 1px solid rgba(0,229,255,0.18);
  background: rgba(3,7,16,0.92);
  backdrop-filter: blur(14px);
  border-radius: 16px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
}
.diagram-tooltip {
  width: 300px;
  padding: 12px 14px;
  pointer-events: none;
  transition: opacity 0.14s ease, transform 0.14s ease;
}
.diagram-tooltip-title {
  font-family: var(--font-display);
  font-size: 16px;
  margin-bottom: 6px;
  letter-spacing: 1px;
}
.diagram-tooltip-text {
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.55;
}
.diagram-detail-panel {
  right: 18px;
  top: 18px;
  width: min(320px, calc(100% - 36px));
  padding: 16px 16px 14px;
}
.diagram-detail-label {
  font-family: var(--font-code);
  font-size: 9px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 6px;
}
.diagram-detail-panel h3 {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 1px;
  margin: 0 0 8px;
}
.diagram-detail-panel p {
  margin: 0;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.65;
}
.diagram-facts {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}
.diagram-fact {
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
}
.diagram-fact-label {
  font-family: var(--font-code);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 4px;
}
.diagram-fact-value {
  font-size: 12px;
  color: var(--text-2);
  line-height: 1.45;
}
.diagram-detail-note {
  margin-top: 12px;
  font-family: var(--font-code);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-3);
}

@keyframes dashFlow {
  to { stroke-dashoffset: -240; }
}

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .page-layout { grid-template-columns: 1fr; }
  .sidebar-toc { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--border); padding: 20px 24px; }
  .page-content { padding: 40px 32px 80px; }
  nav.site-nav { padding: 16px 24px; }
  .nav-links { gap: 20px; }
  footer.site-footer { grid-template-columns: 1fr; padding: 40px 24px; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .display-xl { font-size: 56px; }
}

.diagram-shell .diagram-stage { will-change: transform; }

/* ── 2026-04 layout readability fixes ───────────────────────────── */
nav.site-nav { gap: 22px; }
.nav-logo { flex: 0 0 auto; }
.nav-links { flex: 1 1 auto; justify-content: center; gap: clamp(14px, 1.45vw, 26px); min-width: 0; }
.nav-links a, .nav-cta { white-space: nowrap; }
.nav-cta { flex: 0 0 auto; }
@media (max-width: 1280px) {
  nav.site-nav { padding: 16px 24px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 10px; letter-spacing: 1.4px; }
  .nav-cta { padding: 8px 14px; font-size: 10px; }
}
@media (max-width: 1120px) {
  .nav-links { display: none; }
}
.learning-section { padding: 90px 80px; border-top: 1px solid rgba(0,229,255,0.08); }
.learning-section.alt { background: radial-gradient(circle at 15% 10%, rgba(0,229,255,0.08), transparent 32%), var(--abyss); }
.section-intro { max-width: 760px; color: var(--text-2); font-size: 16px; line-height: 1.8; margin-top: 14px; }
.card, .feature-cell, .stat-block { min-width: 0; }
.card p, .feature-desc, .stat-label { overflow-wrap: anywhere; }
@media (max-width: 900px) {
  .learning-section, .section, .section-sm { padding-left: 24px; padding-right: 24px; }
}