/**
 * ============================================
 * BRAINDUMP V3.0 DESIGN SYSTEM
 * ============================================
 *
 * @version     3.0.0
 * @date        2026-01-05
 *
 * Based on UX Guide V3.0 Expert Panel Review:
 * - mymind: Clean visual aesthetic, orange accent
 * - Superhuman: Speed, keyboard-first, command palette
 * - Linear: Professional polish, consistent system
 *
 * USAGE:
 * Include this file AFTER design-tokens.css to add V3 enhancements
 *
 * ============================================
 */

/* ============================================
   V3 COLOR SYSTEM (mymind-inspired)
   ============================================ */
:root {
  /* === PRIMARY SURFACES === */
  --v3-bg: #FFFFFF;
  --v3-bg-subtle: #FAFAFA;
  --v3-surface: #FFFFFF;
  --v3-surface-elevated: #FFFFFF;

  /* === BORDERS === */
  --v3-border: #E5E5E5;
  --v3-border-subtle: #F0F0F0;

  /* === TEXT === */
  --v3-text-primary: #171717;
  --v3-text-secondary: #737373;
  --v3-text-muted: #A3A3A3;

  /* === ACCENT (mymind orange) === */
  --v3-accent: #F97316;
  --v3-accent-hover: #EA580C;
  --v3-accent-subtle: rgba(249, 115, 22, 0.1);

  /* === SEMANTIC COLORS === */
  --v3-success: #22C55E;
  --v3-success-subtle: rgba(34, 197, 94, 0.1);
  --v3-warning: #F59E0B;
  --v3-warning-subtle: rgba(245, 158, 11, 0.1);
  --v3-error: #EF4444;
  --v3-error-subtle: rgba(239, 68, 68, 0.1);
  --v3-info: #3B82F6;
  --v3-info-subtle: rgba(59, 130, 246, 0.1);

  /* === SHADOWS (subtle, professional) === */
  --v3-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --v3-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.03);
  --v3-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05), 0 4px 6px rgba(0, 0, 0, 0.03);
  --v3-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08);
  --v3-shadow-card-hover: 0 8px 16px rgba(0, 0, 0, 0.08);
  --v3-shadow-modal: 0 25px 50px rgba(0, 0, 0, 0.15);

  /* === TYPOGRAPHY === */
  --v3-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --v3-font-size-xs: 11px;
  --v3-font-size-sm: 13px;
  --v3-font-size-md: 15px;
  --v3-font-size-lg: 18px;
  --v3-font-size-xl: 24px;
  --v3-font-size-2xl: 32px;

  /* === SPACING (8px grid) === */
  --v3-space-1: 4px;
  --v3-space-2: 8px;
  --v3-space-3: 12px;
  --v3-space-4: 16px;
  --v3-space-5: 20px;
  --v3-space-6: 24px;
  --v3-space-8: 32px;
  --v3-space-10: 40px;

  /* === BORDER RADIUS === */
  --v3-radius-sm: 6px;
  --v3-radius-md: 8px;
  --v3-radius-lg: 12px;
  --v3-radius-xl: 16px;
  --v3-radius-full: 9999px;

  /* === TRANSITIONS === */
  --v3-transition-fast: 150ms ease;
  --v3-transition-normal: 250ms ease;
  --v3-transition-slow: 400ms ease;

  /* === Z-INDEX LAYERS (standardized) === */
  --v3-z-base: 1;
  --v3-z-dropdown: 100;
  --v3-z-sticky: 200;
  --v3-z-overlay: 300;
  --v3-z-modal: 400;
  --v3-z-toast: 500;
  --v3-z-tooltip: 600;
  --v3-z-command-palette: 9000;
  --v3-z-critical: 99999;
}

/* ============================================
   DARK THEME OVERRIDE
   ============================================ */
[data-theme="warm-vault"],
[data-theme="dark"] {
  --v3-bg: #0D0D0D;
  --v3-bg-subtle: #141414;
  --v3-surface: #1A1A1A;
  --v3-surface-elevated: #242424;

  --v3-border: rgba(255, 255, 255, 0.1);
  --v3-border-subtle: rgba(255, 255, 255, 0.05);

  --v3-text-primary: rgba(255, 255, 255, 0.95);
  --v3-text-secondary: rgba(255, 255, 255, 0.6);
  --v3-text-muted: rgba(255, 255, 255, 0.4);

  --v3-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --v3-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
  --v3-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3), 0 4px 6px rgba(0, 0, 0, 0.2);
  --v3-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3);
  --v3-shadow-card-hover: 0 8px 16px rgba(0, 0, 0, 0.4);
  --v3-shadow-modal: 0 25px 50px rgba(0, 0, 0, 0.5);
}

/* ============================================
   V3 CARD BASE STYLES (mymind-inspired)
   ============================================ */
.v3-card {
  background: var(--v3-surface);
  border-radius: var(--v3-radius-lg);
  box-shadow: var(--v3-shadow-card);
  overflow: hidden;
  transition: box-shadow var(--v3-transition-normal), transform var(--v3-transition-normal);
  cursor: pointer;
}

.v3-card:hover {
  box-shadow: var(--v3-shadow-card-hover);
  transform: translateY(-2px);
}

.v3-card--with-border {
  border: 1px solid var(--v3-border-subtle);
}

/* === Card with image === */
.v3-card__media {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

/* === Card content === */
.v3-card__body {
  padding: var(--v3-space-4);
}

.v3-card__title {
  font-size: var(--v3-font-size-md);
  font-weight: 600;
  color: var(--v3-text-primary);
  margin: 0 0 var(--v3-space-2);
  line-height: 1.4;
}

.v3-card__description {
  font-size: var(--v3-font-size-sm);
  color: var(--v3-text-secondary);
  margin: 0 0 var(--v3-space-3);
  line-height: 1.5;
}

.v3-card__meta {
  display: flex;
  align-items: center;
  gap: var(--v3-space-2);
  font-size: var(--v3-font-size-xs);
  color: var(--v3-text-muted);
}

/* ============================================
   V3 MASONRY GRID (Pinterest-style)
   ============================================ */
.v3-masonry {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--v3-space-6);
  padding: var(--v3-space-6);
}

@media (min-width: 1200px) {
  .v3-masonry {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (max-width: 640px) {
  .v3-masonry {
    grid-template-columns: 1fr;
    gap: var(--v3-space-4);
    padding: var(--v3-space-4);
  }
}

/* ============================================
   V3 BUTTONS (Superhuman-inspired)
   ============================================ */
.v3-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--v3-space-2);
  padding: var(--v3-space-3) var(--v3-space-4);
  font-family: var(--v3-font-family);
  font-size: var(--v3-font-size-sm);
  font-weight: 500;
  line-height: 1;
  border: none;
  border-radius: var(--v3-radius-md);
  cursor: pointer;
  transition: all var(--v3-transition-fast);
  min-height: 44px; /* WCAG touch target */
}

.v3-btn--primary {
  background: var(--v3-accent);
  color: white;
}

.v3-btn--primary:hover {
  background: var(--v3-accent-hover);
  transform: translateY(-1px);
}

.v3-btn--secondary {
  background: var(--v3-bg-subtle);
  color: var(--v3-text-primary);
}

.v3-btn--secondary:hover {
  background: var(--v3-border);
}

.v3-btn--ghost {
  background: transparent;
  color: var(--v3-text-secondary);
}

.v3-btn--ghost:hover {
  background: var(--v3-bg-subtle);
  color: var(--v3-text-primary);
}

/* ============================================
   V3 KEYBOARD HINT BAR (V8.0: Hidden by default)
   ============================================ */
/*
 * V8.0: Floating keyboard hints bar is now HIDDEN.
 * It disrupts the clean dashboard aesthetic.
 * Users can discover shortcuts via Help modal (? key).
 * Keeping CSS for future modal-based implementation.
 */
.v3-keyboard-hints {
  display: none; /* V8.0: Hidden - opens via ? key in future */
}

.v3-keyboard-hint {
  display: flex;
  align-items: center;
  gap: var(--v3-space-2);
}

.v3-kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 22px;
  padding: 0 var(--v3-space-2);
  background: var(--v3-surface);
  border: 1px solid var(--v3-border);
  border-radius: var(--v3-radius-sm);
  font-family: inherit;
  font-size: 11px;
  font-weight: 500;
  color: var(--v3-text-secondary);
}

@media (max-width: 768px) {
  .v3-keyboard-hints {
    display: none;
  }
}

/* ============================================
   V3 CONFIDENCE BADGES (Linear-inspired)
   ============================================ */
.v3-confidence {
  display: inline-flex;
  align-items: center;
  gap: var(--v3-space-1);
  padding: 2px var(--v3-space-2);
  font-size: var(--v3-font-size-xs);
  font-weight: 500;
  border-radius: var(--v3-radius-full);
}

.v3-confidence--high {
  background: var(--v3-success-subtle);
  color: var(--v3-success);
}

.v3-confidence--medium {
  background: var(--v3-warning-subtle);
  color: var(--v3-warning);
}

.v3-confidence--low {
  background: var(--v3-error-subtle);
  color: var(--v3-error);
}

/* ============================================
   V3 UTILITY CLASSES
   ============================================ */
.v3-text-primary { color: var(--v3-text-primary); }
.v3-text-secondary { color: var(--v3-text-secondary); }
.v3-text-muted { color: var(--v3-text-muted); }
.v3-text-accent { color: var(--v3-accent); }
.v3-text-success { color: var(--v3-success); }
.v3-text-warning { color: var(--v3-warning); }
.v3-text-error { color: var(--v3-error); }

.v3-bg-surface { background: var(--v3-surface); }
.v3-bg-subtle { background: var(--v3-bg-subtle); }

.v3-rounded-sm { border-radius: var(--v3-radius-sm); }
.v3-rounded-md { border-radius: var(--v3-radius-md); }
.v3-rounded-lg { border-radius: var(--v3-radius-lg); }
.v3-rounded-full { border-radius: var(--v3-radius-full); }

.v3-shadow-sm { box-shadow: var(--v3-shadow-sm); }
.v3-shadow-md { box-shadow: var(--v3-shadow-md); }
.v3-shadow-lg { box-shadow: var(--v3-shadow-lg); }

/* Screen reader only */
.v3-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;
}

/* ============================================
   V3 ANIMATION CLASSES
   ============================================ */
.v3-fade-in {
  animation: v3-fade-in 0.3s ease forwards;
}

@keyframes v3-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.v3-slide-up {
  animation: v3-slide-up 0.25s ease forwards;
}

@keyframes v3-slide-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.v3-scale-in {
  animation: v3-scale-in 0.2s ease forwards;
}

@keyframes v3-scale-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .v3-card,
  .v3-btn,
  .v3-fade-in,
  .v3-slide-up,
  .v3-scale-in {
    animation: none;
    transition: none;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .v3-card {
    box-shadow: none;
    border: 1px solid #ddd;
  }

  .v3-keyboard-hints {
    display: none;
  }
}