/* Modern Sorting Visualizer Styles */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252542;
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --comparing: #f59e0b;
    --swapping: #ef4444;
    --pivot: #8b5cf6;
    --less-than: #3b82f6;
    --greater-than: #ec4899;
    --sorted: #10b981;
    --glow-primary: rgba(99, 102, 241, 0.4);
    --glow-success: rgba(16, 185, 129, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Controls */
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 16px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--bg-tertiary);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--glow-primary);
    transition: transform 0.2s;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.control-group select {
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.control-group select:focus {
    border-color: var(--accent-primary);
}

.control-group span {
    font-size: 0.9rem;
    color: var(--accent-secondary);
    font-weight: 600;
}

/* Buttons */
.button-row {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary {
    background: var(--accent-primary);
    color: white;
    border: 1px solid var(--accent-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.btn-warning:hover:not(:disabled) {
    background: rgba(245, 158, 11, 0.2);
    border-color: var(--warning);
}

.btn-info {
    background: rgba(59, 130, 246, 0.1);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.btn-info:hover:not(:disabled) {
    background: rgba(59, 130, 246, 0.2);
    border-color: #60a5fa;
}

.btn-sound {
    background: rgba(16, 185, 129, 0.1);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.btn-sound:hover:not(:disabled) {
    background: rgba(16, 185, 129, 0.2);
    border-color: #10b981;
}

.btn-sound.sound-off {
    background: rgba(107, 114, 128, 0.1);
    color: #9ca3af;
    border: 1px solid rgba(107, 114, 128, 0.2);
}

/* Stats Panel */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat {
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--bg-tertiary);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-secondary);
}

.phase-badge {
    font-size: 0.85rem !important;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    display: inline-block;
    font-weight: 600;
    letter-spacing: 0.02em;
    border: 1px solid transparent;
    transition: all 0.3s ease;
    background: var(--bg-tertiary);
    /* Default state */
    color: var(--text-secondary);
}

/* Visualization Container */
.visualization-container {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--bg-tertiary);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.bars-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 2px;
    height: 350px;
    padding: 1rem 0;
}

.bar {
    flex: 1;
    max-width: 30px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 4px 4px 0 0;
    transition: all 0.1s ease;
    position: relative;
}

.bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), transparent);
    border-radius: 4px 4px 0 0;
}

.bar.comparing {
    background: linear-gradient(180deg, var(--comparing), #fcd34d) !important;
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.5);
    transform: scaleY(1.02);
}

.bar.swapping {
    background: linear-gradient(180deg, var(--swapping), #f87171) !important;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.5);
    animation: pulse 0.3s ease;
}

.bar.pivot {
    background: linear-gradient(180deg, var(--pivot), #a78bfa) !important;
    box-shadow: 0 0 25px rgba(139, 92, 246, 0.6);
}

.bar.less-than {
    background: linear-gradient(180deg, var(--less-than), #60a5fa) !important;
}

.bar.greater-than {
    background: linear-gradient(180deg, var(--greater-than), #f472b6) !important;
}

.bar.sorted {
    background: linear-gradient(180deg, var(--sorted), #34d399) !important;
    box-shadow: 0 0 15px var(--glow-success);
}

@keyframes pulse {

    0%,
    100% {
        transform: scaleY(1);
    }

    50% {
        transform: scaleY(1.05);
    }
}

/* Legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--bg-tertiary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.legend-color.default {
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
}

.legend-color.comparing {
    background: var(--comparing);
}

.legend-color.swapping {
    background: var(--swapping);
}

.legend-color.pivot {
    background: var(--pivot);
}

.legend-color.less-than {
    background: var(--less-than);
}

.legend-color.greater-than {
    background: var(--greater-than);
}

.legend-color.sorted {
    background: var(--sorted);
}

/* Info Panel */
.info-panel {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--bg-tertiary);
}

.info-panel h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.info-content ul {
    margin-left: 1.5rem;
    margin-top: 0.75rem;
}

.info-content li {
    margin-bottom: 0.5rem;
}

.info-content strong {
    color: var(--accent-secondary);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer code {
    background: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: 'Fira Code', 'Monaco', monospace;
    color: var(--accent-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.75rem;
    }

    .bars-container {
        height: 250px;
    }

    .button-row {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}