/* GN Tracing Unified Design Tokens — Light & Dark */
/* Import this file before any page-specific styles */

/* ============================================================
   1. NO-FLASH GUARD
   This must be the first rule in every page's CSS cascade.
   ============================================================ */
html:not([data-theme]) {
  visibility: hidden;
}
html[data-theme] {
  visibility: visible;
}

/* ============================================================
   2. DARK MODE (Default)
   ============================================================ */
:root,
[data-theme="dark"] {
  /* Surfaces */
  --bg-base: #0b1120;
  --bg-elevated: #0f1728;
  --bg-surface: rgba(13, 22, 40, 0.86);
  --bg-surface-solid: #0d1628;
  --bg-card: rgba(8, 15, 30, 0.34);
  --bg-card-hover: rgba(14, 24, 45, 0.78);
  --bg-input: rgba(11, 18, 33, 0.82);
  --bg-input-hover: rgba(15, 25, 45, 0.92);
  --bg-toast: rgba(13, 22, 40, 0.96);
  --bg-overlay: rgba(2, 6, 23, 0.72);
  --bg-success-soft: rgba(20, 83, 45, 0.72);
  --bg-error-soft: rgba(69, 10, 10, 0.48);
  --bg-warning-soft: rgba(251, 191, 36, 0.08);
  --bg-accent-soft: rgba(37, 99, 235, 0.18);
  --bg-danger-soft: rgba(153, 27, 27, 0.18);

  /* Text */
  --text-primary: #f8fbff;
  --text-secondary: #b7c4df;
  --text-muted: #8d99ae;
  --text-dim: #7a8a9e;
  --text-inverse: #0b1120;

  /* Accent (Electric Blue) */
  --accent: #4f8cff;
  --accent-hover: #3b7aee;
  --accent-muted: rgba(96, 165, 250, 0.72);
  --accent-subtle: rgba(96, 165, 250, 0.38);
  --accent-ghost: rgba(96, 165, 250, 0.16);

  /* Semantic colors */
  --danger: #ff6b6b;
  --danger-hover: #ff5252;
  --danger-soft: #fecaca;
  --danger-bg: #3a1820;
  --danger-border: #6b2330;
  --success: #22c55e;
  --success-hover: #16a34a;
  --success-soft: #86efac;
  --success-bg: #12351f;
  --success-border: #1f7a3a;
  --warning: #f59e0b;
  --warning-soft: #f8d777;
  --info: #38bdf8;
  --info-soft: #93c5fd;

  /* Borders */
  --border-subtle: rgba(129, 149, 196, 0.16);
  --border-default: rgba(129, 149, 196, 0.2);
  --border-hover: rgba(96, 165, 250, 0.38);
  --border-focus: rgba(96, 165, 250, 0.72);
  --border-danger: rgba(248, 113, 113, 0.24);
  --border-success: rgba(34, 197, 94, 0.42);
  --border-input: #304466;
  --border-input-hover: #46618d;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 10px 22px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.28);
  --shadow-xl: 0 22px 70px rgba(0, 0, 0, 0.48);
  --shadow-accent: 0 10px 22px rgba(79, 140, 255, 0.24);

  /* Scrollbar */
  --scrollbar-track: transparent;
  --scrollbar-thumb: #304466;

  /* Glassmorphism */
  --glass-bg: rgba(13, 22, 40, 0.86);
  --glass-border: rgba(129, 149, 196, 0.2);
  --glass-blur: blur(14px);

  /* Gradients */
  --gradient-hero:
    radial-gradient(circle at 12% 0%, rgba(79, 140, 255, 0.22), transparent 32rem),
    radial-gradient(circle at 88% 12%, rgba(46, 196, 182, 0.1), transparent 28rem),
    linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg-base) 100%);
  --gradient-accent: linear-gradient(90deg, rgba(96, 165, 250, 0.26), rgba(59, 130, 246, 0.14));
  --gradient-success: linear-gradient(90deg, rgba(34, 197, 94, 0.28), rgba(22, 163, 74, 0.14));
  --gradient-danger: linear-gradient(90deg, rgba(239, 68, 68, 0.28), rgba(220, 38, 38, 0.14));
}

/* ============================================================
   3. LIGHT MODE
   ============================================================ */
[data-theme="light"] {
  /* Surfaces */
  --bg-base: #f8fafc;
  --bg-elevated: #ffffff;
  --bg-surface: rgba(255, 255, 255, 0.86);
  --bg-surface-solid: #f1f5f9;
  --bg-card: rgba(241, 245, 249, 0.6);
  --bg-card-hover: rgba(226, 232, 240, 0.8);
  --bg-input: #f8fafc;
  --bg-input-hover: #f1f5f9;
  --bg-toast: rgba(255, 255, 255, 0.98);
  --bg-overlay: rgba(15, 23, 42, 0.5);
  --bg-success-soft: rgba(34, 197, 94, 0.1);
  --bg-error-soft: rgba(239, 68, 68, 0.08);
  --bg-warning-soft: rgba(251, 191, 36, 0.08);
  --bg-accent-soft: rgba(59, 130, 246, 0.1);
  --bg-danger-soft: rgba(239, 68, 68, 0.08);

  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #f8fafc;

  /* Accent */
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-muted: rgba(37, 99, 235, 0.72);
  --accent-subtle: rgba(37, 99, 235, 0.2);
  --accent-ghost: rgba(37, 99, 235, 0.08);

  /* Semantic */
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --danger-soft: #fca5a5;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --success: #16a34a;
  --success-hover: #15803d;
  --success-soft: #86efac;
  --success-bg: #f0fdf4;
  --success-border: #bbf7d0;
  --warning: #d97706;
  --warning-soft: #fde68a;
  --info: #0284c7;
  --info-soft: #7dd3fc;

  /* Borders */
  --border-subtle: rgba(148, 163, 184, 0.2);
  --border-default: rgba(148, 163, 184, 0.3);
  --border-hover: rgba(37, 99, 235, 0.3);
  --border-focus: rgba(37, 99, 235, 0.6);
  --border-danger: rgba(239, 68, 68, 0.3);
  --border-success: rgba(34, 197, 94, 0.4);
  --border-input: #cbd5e1;
  --border-input-hover: #94a3b8;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 10px 22px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 50px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 22px 70px rgba(15, 23, 42, 0.12);
  --shadow-accent: 0 10px 22px rgba(37, 99, 235, 0.18);

  /* Scrollbar */
  --scrollbar-track: transparent;
  --scrollbar-thumb: #cbd5e1;

  /* Glassmorphism (lighter in light mode) */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(148, 163, 184, 0.25);
  --glass-blur: blur(16px);

  /* Gradients */
  --gradient-hero:
    radial-gradient(circle at 12% 0%, rgba(59, 130, 246, 0.08), transparent 32rem),
    radial-gradient(circle at 88% 12%, rgba(46, 196, 182, 0.05), transparent 28rem),
    linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg-base) 100%);
  --gradient-accent: linear-gradient(90deg, rgba(59, 130, 246, 0.15), rgba(37, 99, 235, 0.08));
  --gradient-success: linear-gradient(90deg, rgba(34, 197, 94, 0.15), rgba(22, 163, 74, 0.08));
  --gradient-danger: linear-gradient(90deg, rgba(239, 68, 68, 0.15), rgba(220, 38, 38, 0.08));
}

/* ============================================================
   4. SHARED UTILITIES
   ============================================================ */

/* Base reset */
.gn-theme-reset {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Body base */
.gn-theme-body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 13px;
  color: var(--text-primary);
  background: var(--gradient-hero);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Buttons */
.gn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition:
    border-color 150ms ease,
    background 150ms ease,
    box-shadow 150ms ease,
    color 150ms ease,
    transform 80ms ease;
  background: var(--bg-input);
  color: var(--text-primary);
  border-color: var(--border-input);
}

.gn-btn:hover:not(:disabled) {
  background: var(--bg-input-hover);
  border-color: var(--border-input-hover);
}

.gn-btn:active:not(:disabled) {
  transform: scale(0.98) translateY(1px);
}

.gn-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.gn-btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: rgba(79, 140, 255, 0.3);
  box-shadow: var(--shadow-accent);
}

.gn-btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 12px 28px rgba(79, 140, 255, 0.3);
}

.gn-btn-danger {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-soft);
}

.gn-btn-danger:hover:not(:disabled) {
  background: rgba(220, 38, 38, 0.12);
  border-color: var(--danger);
}

.gn-btn-secondary {
  background: var(--bg-input);
  border-color: var(--border-input);
  color: var(--text-primary);
}

.gn-btn-secondary:hover:not(:disabled) {
  background: var(--bg-input-hover);
  border-color: var(--border-input-hover);
}

.gn-btn-small {
  padding: 4px 10px;
  font-size: 11px;
  min-height: 28px;
}

/* Icon buttons */
.gn-icon-btn {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-input);
  border-radius: 8px;
  background: var(--bg-input);
  color: var(--text-primary);
  cursor: pointer;
  transition:
    border-color 150ms ease,
    background 150ms ease,
    color 150ms ease,
    transform 80ms ease;
}

.gn-icon-btn:hover:not(:disabled) {
  border-color: var(--border-input-hover);
  background: var(--bg-input-hover);
}

.gn-icon-btn:active:not(:disabled) {
  transform: scale(0.95);
}

.gn-icon-btn svg {
  width: 14px;
  height: 14px;
  display: block;
}

/* Focus */
.gn-focus:focus-visible {
  outline: 2px solid var(--accent-muted);
  outline-offset: 3px;
}

/* Cards / Panels */
.gn-card {
  padding: 12px;
  border: 1px solid var(--border-default);
  border-radius: 12px;
  background: var(--bg-card);
  transition:
    border-color 150ms ease,
    background 150ms ease,
    box-shadow 150ms ease;
}

.gn-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.gn-panel {
  padding: 12px;
  border: 1px solid var(--border-default);
  border-radius: 14px;
  background: var(--glass-bg);
  box-shadow: var(--shadow-md);
  backdrop-filter: var(--glass-blur);
}

.gn-panel-lg {
  padding: 22px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
}

/* Inputs */
.gn-input {
  width: 100%;
  min-height: 38px;
  padding: 8px 11px;
  border: 1px solid var(--border-input);
  border-radius: 8px;
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 13px;
  transition:
    border-color 150ms ease,
    box-shadow 150ms ease,
    background 150ms ease;
  outline: none;
}

.gn-input:hover {
  border-color: var(--border-input-hover);
  background: var(--bg-input-hover);
}

.gn-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ghost);
}

.gn-input::placeholder {
  color: var(--text-dim);
}

/* Scrollbar */
.gn-scrollbar::-webkit-scrollbar {
  width: 8px;
}

.gn-scrollbar::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

.gn-scrollbar::-webkit-scrollbar-thumb {
  border: 2px solid var(--bg-base);
  border-radius: 999px;
  background: var(--scrollbar-thumb);
}

/* Hidden */
.hidden,
.gn-hidden {
  display: none !important;
}

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

/* Theme toggle specific */
.gn-theme-toggle {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-input);
  border-radius: 8px;
  background: var(--bg-input);
  color: var(--text-primary);
  cursor: pointer;
  transition:
    border-color 150ms ease,
    background 150ms ease,
    color 150ms ease,
    transform 80ms ease;
}

.gn-theme-toggle:hover {
  border-color: var(--border-input-hover);
  background: var(--bg-input-hover);
}

.gn-theme-toggle:active {
  transform: scale(0.95);
}

.gn-theme-toggle svg {
  width: 14px;
  height: 14px;
  display: block;
}

/* Progress */
.gn-progress {
  position: relative;
  overflow: hidden;
  min-height: 10px;
  border: 1px solid var(--border-input);
  border-radius: 999px;
  background: var(--bg-input);
}

.gn-progress-fill {
  position: absolute;
  inset: 0;
  width: var(--progress, 0%);
  border-radius: inherit;
  background: var(--gradient-accent);
  transition: width 200ms ease;
}

.gn-progress-fill.success {
  background: var(--gradient-success);
}

.gn-progress-fill.danger {
  background: var(--gradient-danger);
}