/* C++ DSA & LLD Mastery Hub Stylesheet */
:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1e293b;
  --bg-card: #131d2e;
  --bg-card-hover: #1a273e;
  --border-color: #24324d;
  --border-color-light: #334466;
  --text-primary: #f3f4f6;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --code-bg: #0d1321;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --border-color: #e2e8f0;
  --border-color-light: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-blue: #2563eb;
  --accent-purple: #7c3aed;
  --accent-cyan: #0891b2;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  --code-bg: #1e293b;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-color-light);
}

/* Code fonts */
code, pre, .font-mono {
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', Courier, monospace;
}

/* Smooth transitions */
.transition-all-200 {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Glow effects */
.glow-blue {
  box-shadow: 0 0 25px -5px rgba(59, 130, 246, 0.25);
}
.glow-purple {
  box-shadow: 0 0 25px -5px rgba(139, 92, 246, 0.25);
}

/* Category Badge Colors */
.badge-cyan { background: rgba(6, 182, 212, 0.15); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.3); }
.badge-blue { background: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-purple { background: rgba(139, 92, 246, 0.15); color: #a78bfa; border: 1px solid rgba(139, 92, 246, 0.3); }
.badge-amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-emerald { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-green { background: rgba(34, 197, 94, 0.15); color: #4ade80; border: 1px solid rgba(34, 197, 94, 0.3); }
.badge-yellow { background: rgba(234, 179, 8, 0.15); color: #facc15; border: 1px solid rgba(234, 179, 8, 0.3); }
.badge-indigo { background: rgba(99, 102, 241, 0.15); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.3); }
.badge-pink { background: rgba(236, 72, 153, 0.15); color: #f472b6; border: 1px solid rgba(236, 72, 153, 0.3); }
.badge-rose { background: rgba(244, 63, 94, 0.15); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.3); }
.badge-orange { background: rgba(249, 115, 22, 0.15); color: #fb923c; border: 1px solid rgba(249, 115, 22, 0.3); }
.badge-teal { background: rgba(20, 184, 166, 0.15); color: #2dd4bf; border: 1px solid rgba(20, 184, 166, 0.3); }
.badge-sky { background: rgba(14, 165, 233, 0.15); color: #38bdf8; border: 1px solid rgba(14, 165, 233, 0.3); }
.badge-violet { background: rgba(124, 58, 237, 0.15); color: #c084fc; border: 1px solid rgba(124, 58, 237, 0.3); }

/* Difficulty Badges */
.diff-easy { background: rgba(16, 185, 129, 0.15); color: #10b981; border: 1px solid rgba(16, 185, 129, 0.3); }
.diff-medium { background: rgba(245, 158, 11, 0.15); color: #f59e0b; border: 1px solid rgba(245, 158, 11, 0.3); }
.diff-hard { background: rgba(244, 63, 94, 0.15); color: #f43f5e; border: 1px solid rgba(244, 63, 94, 0.3); }

/* Status Badges */
.status-todo { background: rgba(100, 116, 139, 0.15); color: #94a3b8; border: 1px solid rgba(100, 116, 139, 0.3); }
.status-in_progress { background: rgba(245, 158, 11, 0.18); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.4); }
.status-completed { background: rgba(16, 185, 129, 0.18); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.4); }
.status-revision { background: rgba(236, 72, 153, 0.18); color: #f472b6; border: 1px solid rgba(236, 72, 153, 0.4); }

/* Custom Checkbox */
.custom-checkbox {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color-light);
  border-radius: 6px;
  background-color: var(--bg-tertiary);
  cursor: pointer;
  position: relative;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.custom-checkbox:hover {
  border-color: var(--accent-blue);
}
.custom-checkbox:checked {
  background-color: var(--accent-emerald);
  border-color: var(--accent-emerald);
}
.custom-checkbox:checked::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

/* Star Rating */
.star-btn {
  cursor: pointer;
  color: #475569;
  transition: color 0.15s ease, transform 0.15s ease;
}
.star-btn:hover {
  transform: scale(1.2);
}
.star-btn.active {
  color: #fbbf24;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
  animation: fadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Modal overlay */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(3, 7, 18, 0.75);
  backdrop-filter: blur(4px);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

/* Code container */
.code-wrapper {
  background: var(--code-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.code-wrapper pre {
  margin: 0 !important;
  padding: 1.25rem !important;
  font-size: 0.88rem;
  line-height: 1.6;
  max-height: 520px;
  overflow: auto;
}

/* Tooltip */
.tooltip-container {
  position: relative;
}
.tooltip-text {
  visibility: hidden;
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background-color: #1e293b;
  color: #f8fafc;
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  z-index: 60;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  border: 1px solid #334155;
}
.tooltip-container:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

/* Print Friendly */
@media print {
  .no-print {
    display: none !important;
  }
}