/* ==========================================================================
   NEXON AXIOM — UNIFIED DESIGN SYSTEM (DARK / LIGHT THEME TOKENS)
   ========================================================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Fonts */
  --font-ui: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-display: 'Playfair Display', Georgia, serif;

  /* Layout dimensions */
  --toolbar-h: 52px;
  --panel-width: 60px;
  --right-panel-w: 240px;

  /* Theme Tokens — Default Dark ("The Void") */
  --bg-void: #030303;
  --bg-subtle: #0A0A0A;
  --bg-elevated: #121212;
  --glass-surface: rgba(18, 18, 18, 0.92);
  --glass-surface-opaque: #121212;
  --glass-card: rgba(14, 14, 14, 0.96);
  --glass-card-hover: rgba(22, 22, 22, 0.98);
  --glass-border: rgba(212, 175, 55, 0.16);
  --glass-border-hover: rgba(212, 175, 55, 0.40);

  /* Gold Accents */
  --gold-pure: #D4AF37;
  --gold-dim: #8A6E1A;
  --gold-light: #F5E7A3;
  --gold-deep: #B8860B;
  --gold-glow: rgba(212, 175, 55, 0.08);
  --gold-glow-strong: rgba(212, 175, 55, 0.22);
  --gold-border-subtle: rgba(212, 175, 55, 0.25);

  /* Silver & Monochrome */
  --silver-accent: #C0C0C0;
  --ink-white: #FFFFFF;
  --ink-gray: #888888;
  --ink-muted: #4B4B4B;
  --ink-faint: #222222;

  /* Semantic status colors */
  --ink-emerald: #22C55E;
  --ink-crimson: #EF4444;
  --ink-blue: #60A5FA;
  --ink-purple: #A78BFA;
  --ink-orange: #F97316;

  /* Canvas grid */
  --canvas-grid-dot: rgba(212, 175, 55, 0.20);
  --canvas-grid-line: rgba(212, 175, 55, 0.04);
  --canvas-grid-major: rgba(212, 175, 55, 0.10);
  --selection-box: rgba(212, 175, 55, 0.14);

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.65);
  --shadow-card-hover: 0 14px 40px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(212, 175, 55, 0.35);
  --shadow-modal: 0 24px 80px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(212, 175, 55, 0.25);
  --shadow-toast: 0 12px 36px rgba(0, 0, 0, 0.7);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme — "Ivory & Imperial Gold" */
html[data-theme="light"],
body[data-theme="light"] {
  --bg-void: #F7F5F0;
  --bg-subtle: #EFECE4;
  --bg-elevated: #FFFFFF;
  --glass-surface: rgba(255, 255, 255, 0.94);
  --glass-surface-opaque: #FFFFFF;
  --glass-card: rgba(255, 255, 255, 0.97);
  --glass-card-hover: #FFFFFF;
  --glass-border: rgba(184, 134, 11, 0.22);
  --glass-border-hover: rgba(184, 134, 11, 0.50);

  /* High-contrast Gold for Light Mode */
  --gold-pure: #B8860B;
  --gold-dim: #7C5A06;
  --gold-light: #946C09;
  --gold-deep: #614603;
  --gold-glow: rgba(184, 134, 11, 0.10);
  --gold-glow-strong: rgba(184, 134, 11, 0.25);
  --gold-border-subtle: rgba(184, 134, 11, 0.30);

  /* Silver & High Contrast Monochrome */
  --silver-accent: #64748B;
  --ink-white: #111114;
  --ink-gray: #555560;
  --ink-muted: #8E8E9A;
  --ink-faint: #E2E0D8;

  /* Semantic status colors (tuned for light background) */
  --ink-emerald: #16A34A;
  --ink-crimson: #DC2626;
  --ink-blue: #2563EB;
  --ink-purple: #7C3AED;
  --ink-orange: #EA580C;

  /* Canvas grid */
  --canvas-grid-dot: rgba(184, 134, 11, 0.28);
  --canvas-grid-line: rgba(184, 134, 11, 0.07);
  --canvas-grid-major: rgba(184, 134, 11, 0.18);
  --selection-box: rgba(184, 134, 11, 0.12);

  /* Shadows */
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-card-hover: 0 12px 32px rgba(184, 134, 11, 0.15), 0 0 0 1px rgba(184, 134, 11, 0.35);
  --shadow-modal: 0 20px 60px rgba(0, 0, 0, 0.16), 0 0 0 1px rgba(184, 134, 11, 0.25);
  --shadow-toast: 0 8px 28px rgba(0, 0, 0, 0.12);
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-void);
  font-family: var(--font-ui);
  color: var(--ink-white);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Grids */
#bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--canvas-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--canvas-grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
}
#bg-radial {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 40%, var(--gold-glow) 0%, transparent 70%);
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--glass-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--gold-dim);
}

/* Universal Keyframes */
@keyframes pulse-brand {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.72);
  }
}

@keyframes pulse-gold {
  0%, 100% {
    box-shadow: 0 0 8px var(--gold-glow);
  }
  50% {
    box-shadow: 0 0 24px var(--gold-glow-strong);
  }
}

@keyframes toast-in {
  from {
    transform: translateY(16px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes modal-pop {
  from {
    transform: scale(0.96) translateY(8px);
    opacity: 0;
  }
  to {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

/* Theme Toggle Button Component */
.theme-toggle-btn {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  border: 0.5px solid var(--glass-border);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-gray);
  transition: all var(--transition-fast);
}
.theme-toggle-btn:hover {
  background: var(--gold-glow);
  color: var(--gold-pure);
  border-color: var(--glass-border-hover);
}
.theme-toggle-btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 1.6;
}

/* Toast Component */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 500;
  background: var(--glass-surface);
  border: 0.5px solid var(--glass-border);
  border-radius: 8px;
  padding: 10px 18px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--ink-white);
  box-shadow: var(--shadow-toast);
  transform: translateY(16px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 10px;
}
#toast.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
#toast.ok::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-emerald);
  flex-shrink: 0;
}
#toast.err::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-crimson);
  flex-shrink: 0;
}
#toast.warn::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-orange);
  flex-shrink: 0;
}

/* Modal Overlay & Card Defaults */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.modal-box {
  background: var(--glass-card);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  box-shadow: var(--shadow-modal);
  width: 90%;
  max-width: 520px;
  padding: 24px 28px;
  animation: modal-pop 0.22s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  position: relative;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.modal-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-pure);
}
.modal-close {
  background: none;
  border: none;
  color: var(--ink-gray);
  cursor: pointer;
  padding: 4px;
  font-size: 16px;
  line-height: 1;
  border-radius: 4px;
  transition: all var(--transition-fast);
}
.modal-close:hover {
  color: var(--ink-white);
  background: var(--gold-glow);
}