/* ==============================================================================
   DECODER · ECU LAB — Design System Tokens & Base Ambient Canvas
   web/components/tokens.css
   Aligned with UI Concepts (#kit) Glassmorphism & CRT Monitor Optics
   ============================================================================== */

:root {
  /* Public-page scale: shared by the landing, preview and illustrated guide. */
  --public-body: clamp(16px, 1.2vw, 18px);
  --public-control: 15px;
  --public-caption: 13px;
  --public-heading: clamp(26px, 2.8vw, 36px);
  --public-subheading: 20px;
  --public-hero: clamp(36px, 5vw, 64px);
  --public-leading: 1.65;
  --public-touch: 48px;
  --public-dark-canvas: #070a10;
  --public-dark-panel: #101c2b;
  --public-dark-ink: #edf5ff;
  --public-dark-muted: #b7c8d8;
  --public-dark-link: #7dd3fc;
  --public-dark-edge: #466076;
  --public-light-panel: #ffffff;
  --public-light-muted: #40566e;
  --public-light-link: #075985;
  --public-light-edge: #7890a5;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-synthesis: none;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* Typography scale */
  --kit-meta: 10px;
  --kit-caption: 11px;
  --kit-ui: 12px;
  --kit-body: 13px;
  --kit-heading: 16px;

  /* Geometry & Spacing */
  --radius-panel: 18px;
  --radius-control: 6px;
  --radius-monitor: 12px;
  --space-unit: 8px;
  --space-half: 4px;
  --space-2: calc(var(--space-unit) * 2);
  --space-3: calc(var(--space-unit) * 3);
  --space-4: calc(var(--space-unit) * 4);
  --motion-fast: 150ms;
  --motion-normal: 220ms;
  --motion-feedback: 200ms;
  --motion-slow: 300ms;

  /* UI Concepts / Green Studio Codes: controls have their own material. */
  --ui-font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ui-radius-button: 6px;
  --ui-radius-thumb: 4px;
  --ui-focus-ring: 0 0 0 3px color-mix(in srgb, var(--ui-accent) 19%, transparent);

  /* Focus ring */
  --focus-ring: 0 0 0 3px rgba(56, 189, 248, 0.28);

  /* Procedural SVG grain texture */
  --grain-texture: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath fill='%238899aa' opacity='.2' filter='url(%23n)' d='M0 0h180v180H0z'/%3E%3C/svg%3E");
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-width: 280px;
  padding: max(12px, env(safe-area-inset-top)) 12px max(12px, env(safe-area-inset-bottom));
  font-size: var(--kit-ui);
  line-height: 1.5;
  background-color: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  transition: background-color .3s ease, color .3s ease;
  position: relative;
  overflow-x: hidden;
  /* Keep fixed negative-z ambient layers above the page base, below content. */
  isolation: isolate;
}

/* Ambient canvas: multi-tier coordinate grid & depth glow */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 85% 15%, var(--blue-glow), transparent 60%),
    radial-gradient(ellipse 65% 55% at 15% 85%, var(--mint-glow), transparent 60%),
    repeating-linear-gradient(0deg, transparent 0 31px, var(--grid) 31px 32px),
    repeating-linear-gradient(90deg, transparent 0 31px, var(--grid) 31px 32px),
    repeating-linear-gradient(0deg, transparent 0 159px, var(--grid-major) 159px 160px),
    repeating-linear-gradient(90deg, transparent 0 159px, var(--grid-major) 159px 160px);
  background-position: center;
  z-index: -2;
}

/* Atmospheric analog grain */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: var(--grain);
  background-image: var(--grain-texture);
  z-index: -1;
}

button, input, textarea {
  font: inherit;
}

/* ==============================================================================
   Theme Dark (Cyber-Optic Blue / Phosphor Lab)
   ============================================================================== */
.theme-dark {
  --public-panel: var(--public-dark-panel);
  --public-muted: var(--public-dark-muted);
  --public-link: var(--public-dark-link);
  --public-edge: var(--public-dark-edge);
  color-scheme: dark;
  --ui-accent: #25f878;
  --ui-on-accent: #0b1423;
  --ui-face: rgba(5, 23, 30, .46);
  --ui-edge: rgba(119, 180, 185, .20);
  --ui-field: rgba(26, 43, 61, .62);
  --ui-thumb: rgba(12, 31, 41, .97);
  --bg: #070a10;
  --ink: #e3edf7;
  --text: #e2e8f0;
  --muted: #738a9c;
  --faint: #475d6e;

  /* Accents */
  --cyan: #38bdf8;
  --cyan-bright: #7dd3fc;
  --cyan-soft: #0284c7;
  --amber: #f59e0b;
  --green: #10b981;
  --green-bright: #34d399;
  --rose: #f43f5e;

  /* Glassmorphism */
  --bg-container: linear-gradient(145deg, rgba(13, 18, 28, 0.88) 0%, rgba(8, 12, 19, 0.80) 100%);
  --bg-card: linear-gradient(145deg, rgba(16, 24, 38, 0.76) 0%, rgba(10, 15, 24, 0.62) 100%);
  --bg-subtle: rgba(19, 27, 42, 0.58);
  --border: rgba(148, 197, 237, 0.14);
  --border-subtle: rgba(148, 197, 237, 0.07);
  --glass-highlight: rgba(255, 255, 255, 0.16);
  --glass-blur: 18px;
  --glass-saturate: 160%;
  --glass-sheen: inset 0 1px 0 var(--glass-highlight), inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  --glass-sheen-hover: inset 0 1px 0 rgba(255, 255, 255, 0.28), inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  --shadow: rgba(0, 4, 14, 0.70);
  --active: #1d2c3e;
  --control: rgba(26, 38, 56, 0.62);

  /* Hardware Monitor & CRT Tokens */
  --monitor-face: rgba(6, 14, 22, 0.70);
  --monitor-rim: rgba(86, 142, 185, 0.22);
  --crt-lines: rgba(0, 0, 0, 0.32);
  --crt-edge: rgba(2, 8, 18, 0.75);
  --crt-grain: 0.11;
  --crt-beam: 0.16;
  --crt-glow: rgba(56, 189, 248, 0.35);

  /* Tactile Buttons */
  --button-face: rgba(17, 26, 39, 0.75);
  --button-edge: rgba(119, 166, 204, 0.24);
  --button-depth: 0 4px 12px -6px rgba(0, 0, 0, 0.6);

  /* Ambient Canvas Variables */
  --blue-glow: rgba(2, 132, 199, 0.20);
  --mint-glow: rgba(160, 225, 205, 0.12);
  --grid: rgba(90, 135, 175, 0.05);
  --grid-major: rgba(90, 135, 175, 0.09);
  --grain: 0.08;

  --term-bg: rgba(5, 11, 18, 0.88);
  --term-hdr: rgba(10, 19, 30, 0.88);
}

/* ==============================================================================
   Theme Light (Crystal Ice / Engineering Clear)
   ============================================================================== */
.theme-light {
  --public-panel: var(--public-light-panel);
  --public-muted: var(--public-light-muted);
  --public-link: var(--public-light-link);
  --public-edge: var(--public-light-edge);
  color-scheme: light;
  --ui-accent: #005d2d;
  --ui-on-accent: #ffffff;
  --ui-face: rgba(238, 248, 255, .50);
  --ui-edge: rgba(66, 112, 140, .18);
  --ui-field: rgba(255, 255, 255, .64);
  --ui-thumb: rgba(241, 249, 255, .97);
  --bg: #e6eef8;
  --ink: #1b2c3d;
  --text: #1a2838;
  --muted: #5e7488;
  --faint: #8ba0b2;

  /* Accents */
  --cyan: #0284c7;
  --cyan-bright: #0369a1;
  --cyan-soft: #0ea5e9;
  --amber: #d97706;
  --green: #059669;
  --green-bright: #10b981;
  --rose: #e11d48;

  /* Glassmorphism */
  --bg-container: linear-gradient(145deg, rgba(248, 252, 255, 0.88) 0%, rgba(236, 244, 253, 0.80) 100%);
  --bg-card: linear-gradient(145deg, rgba(240, 247, 255, 0.76) 0%, rgba(228, 239, 251, 0.60) 100%);
  --bg-subtle: rgba(224, 236, 249, 0.58);
  --border: rgba(45, 87, 120, 0.16);
  --border-subtle: rgba(45, 87, 120, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.95);
  --glass-blur: 18px;
  --glass-saturate: 160%;
  --glass-sheen: inset 0 1px 0 var(--glass-highlight), inset 0 0 0 1px rgba(255, 255, 255, 0.55);
  --glass-sheen-hover: inset 0 1px 0 #ffffff, inset 0 0 0 1px rgba(255, 255, 255, 0.85);
  --shadow: rgba(30, 60, 95, 0.18);
  --active: #ffffff;
  --control: rgba(255, 255, 255, 0.70);

  /* Hardware Monitor & CRT Tokens */
  --monitor-face: rgba(235, 244, 253, 0.68);
  --monitor-rim: rgba(58, 102, 136, 0.22);
  --crt-lines: rgba(24, 52, 75, 0.10);
  --crt-edge: rgba(18, 45, 68, 0.22);
  --crt-grain: 0.06;
  --crt-beam: 0.10;
  --crt-glow: rgba(2, 132, 199, 0.25);

  /* Tactile Buttons */
  --button-face: rgba(255, 255, 255, 0.75);
  --button-edge: rgba(70, 115, 150, 0.25);
  --button-depth: 0 4px 10px -5px rgba(45, 85, 125, 0.18);

  /* Ambient Canvas Variables */
  --blue-glow: rgba(125, 180, 245, 0.35);
  --mint-glow: rgba(160, 225, 205, 0.25);
  --grid: rgba(50, 95, 135, 0.045);
  --grid-major: rgba(50, 95, 135, 0.08);
  --grain: 0.05;

  --term-bg: rgba(240, 247, 255, 0.88);
  --term-hdr: rgba(230, 240, 252, 0.88);
}

/* ==============================================================================
   App Shell Surface Container
   ============================================================================== */
.app-shell {
  width: min(100%, 780px);
  min-height: 640px;
  margin: 0 auto;
  padding: 16px;
  color: var(--text);
  background: var(--bg-container);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate, 160%));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate, 160%));
  border: 1px solid var(--border);
  border-radius: var(--radius-panel);
  box-shadow:
    0 28px 75px -20px var(--shadow),
    0 8px 24px -10px var(--shadow),
    var(--glass-sheen);
  transition: background .25s ease, color .25s ease, border-color .25s ease, box-shadow .25s ease;
  position: relative;
  isolation: isolate;
}

.app-shell::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), transparent 45%, rgba(56, 189, 248, 0.03));
  pointer-events: none;
}

.muted {
  color: var(--muted);
}

.hidden {
  display: none !important;
}