/* =========================================
   AI DEEP DIVE — DESIGN TOKENS
   All colors, fonts, spacing live here.
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Mono:ital,wght@0,300;0,400;0,500;1,400&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&display=swap');

:root {
  /* Dark mode (default) */
  --bg: #07070e;
  --surface: #0f0f1a;
  --surface-2: #181826;
  --surface-3: #212134;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.14);
  --border-accent: rgba(0,212,255,0.25);
  --accent: #00d4ff;
  --accent-dim: rgba(0,212,255,0.12);
  --accent-warm: #ff8c42;
  --accent-warm-dim: rgba(255,140,66,0.15);
  --text: #e2e4f0;
  --text-muted: #626280;
  --text-dim: #2e2e48;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 32px;
  --sp-xl: 64px;
  --sp-2xl: 120px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-full: 100px;
  --t-fast: all 0.15s ease;
  --t-normal: all 0.25s ease;
}

body.light-mode {
  /* Light mode overrides – improved contrast */
  --bg: #f9fafc;
  --surface: #ffffff;
  --surface-2: #f1f3f8;
  --surface-3: #e9ecf2;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.12);
  --border-accent: rgba(0,212,255,0.3);
  --accent: #0088aa;
  --accent-dim: rgba(0,136,170,0.1);
  --accent-warm: #cc7a2c;
  --accent-warm-dim: rgba(204,122,44,0.1);
  --text: #1a1f2e;
  --text-muted: #4a5568;      /* darker for better readability */
  --text-dim: #cbd5e0;        /* keep light for backgrounds */
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(ellipse 900px 700px at 50% -5%, rgba(0,30,60,0.6) 0%, transparent 70%);
}

body.light-mode {
  background-image: radial-gradient(ellipse 900px 700px at 50% -5%, rgba(0,212,255,0.05) 0%, transparent 70%);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: #ffffff;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

body.light-mode h1,
body.light-mode h2,
body.light-mode h3 {
  color: var(--text);
}

h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 800; }
h2 { font-size: clamp(22px, 3.5vw, 36px); font-weight: 700; }
h3 { font-size: clamp(17px, 2.5vw, 22px); font-weight: 600; }

p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.75;
  max-width: 68ch;
}

code, .mono, .label-mono {
  font-family: var(--font-mono);
}

/* Universal card style */
.card, .step-card, .concept-card, .layer-card,
.safety-layer, .resource-card, .repo-card,
.pillar-card, .framework-card, .course-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: var(--t-normal);
}

.card:hover, .step-card:hover, .concept-card:hover,
.layer-card:hover, .safety-layer:hover, .resource-card:hover,
.repo-card:hover, .pillar-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

/* Accent top-bar on key interactive cards */
.card-accent-top {
  border-top: 2px solid var(--accent);
}

/* Section spacing */
section {
  padding-top: var(--sp-2xl);
  padding-bottom: var(--sp-xl);
}

.section-inner, .container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}

/* Section eyebrow */
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: block;
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

th {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

tr:hover td {
  background: var(--surface);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* Responsive */
@media (max-width: 640px) {
  section { padding-top: 64px; padding-bottom: 48px; }
  .section-inner, .container { padding: 0 18px; }
  h1 { font-size: 28px; }
  h2 { font-size: 22px; }

  /* Force all flow diagrams to scroll horizontally */
  .flow-row, .flow-diagram, .pipeline,
  .agent-flow, .rag-flow, .mcp-flow {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 12px;
  }
}