/* Breakpoints: mobile ≤767px | tablet 768–1023px | desktop ≥1024px */

:root {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d27;
  --bg-card: #222533;
  --bg-card-hover: #2a2d3d;
  --bg-input: #181b24;
  --text-primary: #e8eaed;
  --text-secondary: #9aa0a6;
  --text-muted: #6b7280;
  --accent: #6c63ff;
  --accent-hover: #7b73ff;
  --accent-dim: rgba(108, 99, 255, 0.15);
  --success: #34d399;
  --success-dim: rgba(52, 211, 153, 0.15);
  --error: #f87171;
  --error-dim: rgba(248, 113, 113, 0.15);
  --warning: #fbbf24;
  --warning-dim: rgba(251, 191, 36, 0.15);
  --border: #2d3142;
  --border-light: #3a3f55;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1100px;
  --nav-height: 56px;
  --sidebar-width: 220px;
  --transition: 0.2s ease;

  /* Quiz card accent colors */
  --card-lecture: #38bdf8;
  --card-lecture-dim: rgba(56, 189, 248, 0.12);
  --card-expert: #6b7280;
  --card-expert-dim: rgba(107, 114, 128, 0.12);
  --card-recall: #f59e0b;
  --card-recall-dim: rgba(245, 158, 11, 0.12);
  --card-official: #22c55e;
  --card-official-dim: rgba(34, 197, 94, 0.12);

  /* Background pattern */
  --bg-pattern-image: url('../img/bg-pharmacy.webp');
  --bg-pattern-opacity: 0.15;
}


/* Quizlet-inspired light mode */
[data-theme="light"] {
  --bg-primary: #f6f7fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #edefff;
  --bg-input: #edefff;
  --text-primary: #303545;
  --text-secondary: #646e83;
  --text-muted: #939bb4;
  --accent: #4255ff;
  --accent-hover: #2b3ce0;
  --accent-dim: rgba(66, 85, 255, 0.12);
  --success: #23b26d;
  --success-dim: rgba(35, 178, 109, 0.12);
  --error: #ff5252;
  --error-dim: rgba(255, 82, 82, 0.12);
  --warning: #ffcd1f;
  --warning-dim: rgba(255, 205, 31, 0.18);
  --border: #d9dde8;
  --border-light: #edeff4;

  /* Quiz card accent colors (light) */
  --card-lecture: #0284c7;
  --card-lecture-dim: rgba(2, 132, 199, 0.1);
  --card-expert: #9ca3af;
  --card-expert-dim: rgba(156, 163, 175, 0.1);
  --card-recall: #d97706;
  --card-recall-dim: rgba(217, 119, 6, 0.1);
  --card-official: #16a34a;
  --card-official-dim: rgba(22, 163, 74, 0.1);

  --bg-pattern-image: url('../img/bg-pharmacy-light.png');
  --bg-pattern-opacity: 0.10;
}

/* Sidebar icon buttons (theme, sound toggles) */
.sidebar-icon-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.sidebar-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.sidebar-icon-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.sidebar-icon-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Full-width block button for sign-out */
.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

/* Legacy theme-toggle (keep for any remaining usage) */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 8px 12px;
  margin-bottom: 8px;
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.theme-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border);
}
.theme-toggle svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Tighter spacing on mobile */
@media (max-width: 767px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
  }
}