/* ─────────────────────────────────────────────────────────
   base.css — CSS reset, custom properties, typography
   ───────────────────────────────────────────────────────── */

/* ---------- Custom Properties (Design Tokens) ---------- */
:root {
  /* Colors */
  --bg-deep:        #07090f;
  --bg-surface:     #0f1322;
  --bg-card:        #161c2e;
  --bg-card-hover:  #1e2640;
  --bg-terminal:    #0a0f1a;

  --clr-primary:    #00d4ff;
  --clr-secondary:  #a855f7;
  --clr-accent:     #f59e0b;
  --clr-success:    #10b981;
  --clr-warning:    #f59e0b;
  --clr-error:      #ef4444;

  --clr-text:       #e2e8f0;
  --clr-text-muted: #94a3b8;
  --clr-text-dim:   #64748b;

  --clr-border:     rgba(0, 212, 255, 0.15);
  --clr-border-mid: rgba(0, 212, 255, 0.3);

  /* Terminal colors */
  --term-bg:        #060a12;
  --term-text:      #a8ff78;
  --term-prompt:    #00d4ff;
  --term-error:     #ff6b6b;
  --term-warn:      #ffd93d;
  --term-info:      #74b9ff;
  --term-muted:     #636e72;

  /* Fonts */
  --font-base:  'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono:  'Cascadia Code', 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-title: 'Georgia', 'Times New Roman', serif;

  /* Spacing scale */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* Glows */
  --glow-primary:   0 0 16px rgba(0, 212, 255, 0.35), 0 0 32px rgba(0, 212, 255, 0.15);
  --glow-secondary: 0 0 16px rgba(168, 85, 247, 0.35), 0 0 32px rgba(168, 85, 247, 0.15);
  --glow-accent:    0 0 16px rgba(245, 158, 11, 0.35);
  --glow-success:   0 0 16px rgba(16, 185, 129, 0.35);
  --glow-error:     0 0 16px rgba(239, 68, 68, 0.35);

  /* Z-index scale */
  --z-base:    1;
  --z-overlay: 100;
  --z-modal:   200;
  --z-toast:   300;
  --z-top:     400;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-base);
  background-color: var(--bg-deep);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100%;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: var(--clr-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-family: var(--font-title); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p { margin-bottom: var(--sp-4); }
p:last-child { margin-bottom: 0; }

strong { font-weight: 700; color: var(--clr-primary); }
em { font-style: italic; color: var(--clr-accent); }

code {
  font-family: var(--font-mono);
  background: rgba(0, 212, 255, 0.1);
  color: var(--clr-primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

pre {
  font-family: var(--font-mono);
  background: var(--term-bg);
  color: var(--term-text);
  padding: var(--sp-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  line-height: 1.5;
  font-size: 0.875rem;
  border: 1px solid var(--clr-border);
}

/* ---------- Utility Classes ---------- */
.text-primary   { color: var(--clr-primary) !important; }
.text-secondary { color: var(--clr-secondary) !important; }
.text-accent    { color: var(--clr-accent) !important; }
.text-success   { color: var(--clr-success) !important; }
.text-error     { color: var(--clr-error) !important; }
.text-muted     { color: var(--clr-text-muted) !important; }
.text-center    { text-align: center !important; }
.text-mono      { font-family: var(--font-mono) !important; }

.hidden  { display: none !important; }
.visible { visibility: visible !important; }

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

.mt-auto { margin-top: auto !important; }
.mb-4    { margin-bottom: var(--sp-4) !important; }
.mb-8    { margin-bottom: var(--sp-8) !important; }
.gap-4   { gap: var(--sp-4) !important; }

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

/* Focus ring */
:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}