/* 
  AUFN PUNKT — Design Tokens (SSOT)
  Cyan + Magenta on deep charcoal. Mobile-first. WCAG friendly.
  Link this from index.html + studio.html for shared shell + design system.
  NO build step required.
*/

:root {
  /* === BRAND COLORS (never use blue #0066ff) === */
  --bg: #0a0a0a;
  --bg-soft: #121212;
  --bg-elev: #1a1a1a;
  --accent: #00ffff;
  --accent2: #ff00aa;
  --accent3: #ff7a00; /* raw orange accent */
  --text: #e8e8e8;
  --text-dim: #888;
  --text-muted: #555;
  --border: #222;
  --border-soft: #333;

  /* === TYPOGRAPHY === */
  --font-sans: 'Space Grotesk', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Fluid type scale (mobile first) */
  --fs-xs: clamp(10px, 1.8vw, 11px);
  --fs-sm: clamp(11px, 2vw, 13px);
  --fs-base: clamp(14px, 2.2vw, 16px);
  --fs-md: clamp(15px, 2.4vw, 18px);
  --fs-lg: clamp(18px, 3vw, 21px);
  --fs-xl: clamp(24px, 4.5vw, 32px);
  --fs-2xl: clamp(32px, 6vw, 48px);
  --fs-hero: clamp(42px, 8vw, 88px);

  /* === SPACING (mobile first, generous on desktop) === */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;

  /* === TOUCH / TARGETS (WCAG 2.5.5) === */
  --touch-min: 44px;
  --touch-min-sm: 40px; /* for dense grids only when unavoidable */

  /* === BORDERS + RADII === */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 999px;
  --border-w: 1px;

  /* === FOCUS (WCAG 2.4.7 / 2.4.11) === */
  --focus-ring: 2px solid var(--accent);
  --focus-ring-magenta: 2px solid var(--accent2);
  --focus-offset: 2px;
  --focus-outline: 2px solid var(--accent);
  --focus-shadow: 0 0 0 3px rgba(0, 255, 255, 0.25);

  /* === MOTION === */
  --dur-fast: 80ms;
  --dur-base: 160ms;
  --dur-slow: 320ms;
  --ease: cubic-bezier(0.23, 1, 0.32, 1);

  /* === COMPONENT TOKENS (landing + future studio shell) === */
  --nav-h: 56px;
  --nav-bg: rgba(10, 10, 10, 0.95);
  --section-pad-y: clamp(48px, 8vw, 80px);
  --section-pad-x: clamp(16px, 4vw, 24px);
  --card-pad: clamp(16px, 3vw, 24px);

  /* Playground / sequencer */
  --seq-cell-min: 44px;
  --seq-gap: 4px;
  --scope-h: clamp(160px, 28vw, 240px);

  /* Buttons */
  --btn-h: var(--touch-min);
  --btn-pad-x: 18px;
  --btn-fs: 13px;
}

/* Base reset + shared shell styles (safe to link everywhere) */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.5;
  overflow-x: hidden;
}

/* Shared full-bleed background canvas (used by index + future studio) */
.bg-canvas {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: -1;
  opacity: 0.6;
  pointer-events: none;
}

/* Shared sticky nav shell */
nav.app-shell-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 var(--space-5);
  gap: var(--space-4);
}

.app-shell-nav .logo {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.app-shell-nav .logo span { color: var(--accent2); }

.app-shell-nav .nav-links {
  display: flex;
  gap: clamp(12px, 3vw, 22px);
  font-size: var(--fs-sm);
  font-weight: 500;
  margin-left: auto;
}

.app-shell-nav .nav-links a {
  color: var(--text);
  text-decoration: none;
  padding: 6px 4px;
  transition: color var(--dur-fast);
  white-space: nowrap;
}
.app-shell-nav .nav-links a:hover,
.app-shell-nav .nav-links a:focus-visible {
  color: var(--accent);
}

/* Mobile nav: hamburger + slide-in drawer (landing first, studio can reuse) */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: var(--touch-min);
  height: var(--touch-min);
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 18px;
  cursor: pointer;
}
.nav-toggle:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 1px;
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .app-shell-nav .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: var(--space-4) var(--space-5);
    gap: var(--space-2);
    display: none;
    z-index: 999;
  }
  .app-shell-nav .nav-links.open {
    display: flex;
  }
  .app-shell-nav .nav-links a {
    padding: 10px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
  }
  .app-shell-nav .nav-links a:last-child { border-bottom: none; }
}

/* Focus visible globally (cyan ring, high contrast) */
:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  box-shadow: var(--focus-shadow);
}
button:focus-visible,
.btn:focus-visible,
.key:focus-visible,
[role="gridcell"]:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 1px;
}

/* Buttons (shared base) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-min);
  padding: 8px var(--btn-pad-x);
  background: #222;
  border: 1px solid #444;
  color: var(--text);
  border-radius: var(--radius-sm);
  font-size: var(--btn-fs);
  font-weight: 500;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: background var(--dur-fast), border-color var(--dur-fast), color var(--dur-fast), transform var(--dur-fast);
  text-decoration: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover { background: #333; border-color: var(--accent); color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  font-weight: 600;
}
.btn.primary:hover { background: #fff; color: #000; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Form controls */
input[type="range"] {
  accent-color: var(--accent);
  width: 100%;
  min-height: 28px; /* helps touch */
}

/* Ensure no horizontal overflow root */
body, html { max-width: 100vw; }
* { max-width: 100%; } /* defensive, grids etc override */

/* Reduced motion: disable non-essential anims */
@media (prefers-reduced-motion: reduce) {
  .scanlines::after,
  .glitch,
  .neon {
    animation: none !important;
    text-shadow: none !important;
  }
  .gallery-card:hover { transform: none; }
}