/* ==========================================================================
   Linux Permission Lab — Design Tokens
   Signature direction: "amber phosphor terminal" — a nod to pre-green CRT
   terminals (VT100 amber displays) rather than the expected matrix-green
   hacker cliché. Amber is the voice of the product; cyan is informational;
   red/green are reserved strictly for security semantics (critical/safe).
   ========================================================================== */

:root {
  /* ---- Surface ---- */
  --bg-void: #0a0c0d;
  --bg-base: #0d1113;
  --bg-panel: #12181a;
  --bg-elevated: #1a2224;
  --bg-inset: #080a0b;
  --border-hairline: #232d30;
  --border-strong: #33403f;

  /* ---- Amber system (brand voice) ---- */
  --amber-100: #ffe9b3;
  --amber-300: #ffcf5c;
  --amber-500: #ffb000;
  --amber-600: #e69800;
  --amber-glow: rgba(255, 176, 0, 0.35);

  /* ---- Cyan (informational / links / secondary accent) ---- */
  --cyan-400: #5fd8e0;
  --cyan-500: #2bc4d1;
  --cyan-glow: rgba(43, 196, 209, 0.3);

  /* ---- Security semantics (reserved — do not use decoratively) ---- */
  --safe-500: #3ddc84;
  --safe-glow: rgba(61, 220, 132, 0.25);
  --warn-500: #ffcf3d;
  --warn-glow: rgba(255, 207, 61, 0.25);
  --crit-500: #ff5c5c;
  --crit-glow: rgba(255, 92, 92, 0.3);

  /* ---- Text ---- */
  --text-primary: #eef2f1;
  --text-secondary: #a9b6b5;
  --text-tertiary: #6f8180;
  --text-on-amber: #16110a;

  /* ---- Type ---- */
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* ---- Scale ---- */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --sidebar-width: 240px;
  --shadow-panel: 0 8px 30px rgba(0, 0, 0, 0.45);
  --shadow-soft: 0 2px 12px rgba(0, 0, 0, 0.3);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-med: 280ms;
  --dur-slow: 480ms;
}

/* Light theme override (data attribute toggled via JS) */
:root[data-theme="light"] {
  --bg-void: #eef1ef;
  --bg-base: #f6f7f5;
  --bg-panel: #ffffff;
  --bg-elevated: #ffffff;
  --bg-inset: #e7ebe9;
  --border-hairline: #dbe0de;
  --border-strong: #c3cbc8;
  --text-primary: #131b1a;
  --text-secondary: #4b5957;
  --text-tertiary: #7c8886;
  --amber-glow: rgba(230, 152, 0, 0.25);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg-base);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(255,176,0,0.06), transparent),
    repeating-linear-gradient(180deg, rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px, transparent 1px, transparent 3px);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  min-height: 100vh;
  transition: background-color var(--dur-med) var(--ease-out), color var(--dur-med) var(--ease-out);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 var(--space-3);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 var(--space-3); color: var(--text-secondary); }

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

a { color: var(--cyan-400); text-decoration: none; }
a:hover { color: var(--amber-300); }

ul { padding-left: 1.1em; color: var(--text-secondary); }

::selection { background: var(--amber-glow); color: var(--text-primary); }

/* Visible keyboard focus everywhere */
:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-500);
}

.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--amber-500);
  color: var(--text-on-amber);
  padding: var(--space-2) var(--space-4);
  z-index: 999;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-inset); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--amber-600); }