/* ═══════════════════════════════════════════════════════════
   TOOLKIT — core.css
   CSS Custom Properties · Reset · Base · Background FX
   ═══════════════════════════════════════════════════════════ */

/* ── 0. Self-hosted Fonts ──────────────────────────────────── */
@font-face {
  font-family: 'Space Grotesk';
  src: url('../fonts/SpaceGrotesk.woff2') format('woff2');
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('../fonts/JetBrainsMono.woff2') format('woff2');
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('../fonts/JetBrainsMono-Italic.woff2') format('woff2');
  font-weight: 100 800;
  font-style: italic;
  font-display: swap;
}

/* ── 1. CSS Custom Properties ─────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-base:     #05070f;
  --bg-surface:  #0b0f1e;
  --bg-elevated: #111829;
  --bg-card:     rgba(15, 20, 40, 0.55);

  /* Brand colours */
  --cyan:       #00d4ff;
  --cyan-dim:   rgba(0, 212, 255, 0.15);
  --cyan-glow:  rgba(0, 212, 255, 0.35);
  --purple:     #7c3aed;
  --purple-dim: rgba(124, 58, 237, 0.15);

  /* Status */
  --green:  #10d97e;
  --yellow: #f5c542;
  --red:    #ff4d6a;

  /* Text */
  --text-primary:   #e8efff;
  --text-secondary: #8892a4;
  --text-muted:     #718096;
  --control-muted:  #4a5568;
  --text-code:      #a5f3fc;

  /* Borders */
  --border:       rgba(255, 255, 255, 0.07);
  --border-hover: rgba(255, 255, 255, 0.14);

  /* Typography */
  --font-sans: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-ui:   var(--font-sans);

  /* Layout */
  --nav-h:     68px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-full: 999px;
  --radius:    var(--radius-md);

  /* Motion */
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-card: 0 8px 40px rgba(0,0,0,0.55), 0 1px 0 rgba(255,255,255,0.04) inset;
}

/* ── 2. Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
ul, ol   { list-style: none; }
a        { color: inherit; text-decoration: none; }
button   { font-family: inherit; }

/* Keep keyboard focus visible even where a component removes its native outline. */
:is(a[href], button, input, select, textarea, summary, [role="button"], [tabindex]):focus-visible {
  outline: 2px solid var(--cyan) !important;
  outline-offset: 2px;
}

/* ── 3. Screen-reader only ────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ── 4. Background FX ─────────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

.bg-glow {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  border-radius: 50%;
  filter: blur(120px);
  animation: glowPulse 8s ease-in-out infinite;
}

.bg-glow--1 {
  width: 600px; height: 600px;
  top: -200px; left: -200px;
  background: rgba(124, 58, 237, 0.12);
}

.bg-glow--2 {
  width: 500px; height: 500px;
  bottom: -150px; right: -150px;
  background: rgba(0, 212, 255, 0.08);
  animation-delay: -4s;
}

@keyframes glowPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(1.1); }
}

/* ── 5. Selection ─────────────────────────────────────────── */
::selection {
  background: rgba(0, 212, 255, 0.25);
  color: var(--text-primary);
}

/* ── 6. Scrollbar ─────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.12);
  border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(0,212,255,0.3); }

/* ── 7. Focus & Accessibility ─────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Respect motion preferences and avoid unnecessary visual work on mobile. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}