/* Visual Sorting - Multi-Theme Support */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

/* ========== THEME DEFINITIONS ========== */

/* Dark Theme (Default) */
[data-theme="dark"] {
    --bg-primary: #1a1d23;
    --bg-secondary: #22262e;
    --bg-tertiary: #2a2f38;
    --bg-hover: #323842;
    --text-primary: #e4e7eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-primary: #67e8f9;
    --accent-secondary: #4ade80;
    --bar-default: #7dd3fc;
    --bar-comparing: #c084fc;
    --bar-swapping: #4ade80;
    --bar-sorted: #4ade80;
    --border-color: #374151;
    --slider-track: #374151;
    --slider-fill: #4ade80;
    --btn-primary-bg: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --btn-primary-hover: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
}

/* Midnight Theme */
[data-theme="midnight"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #16162a;
    --bg-tertiary: #1e1e3a;
    --bg-hover: #2a2a4a;
    --text-primary: #e8e8ff;
    --text-secondary: #a0a0c0;
    --text-muted: #6060a0;
    --accent-primary: #818cf8;
    --accent-secondary: #a78bfa;
    --bar-default: #6366f1;
    --bar-comparing: #f472b6;
    --bar-swapping: #fbbf24;
    --bar-sorted: #34d399;
    --border-color: #303050;
    --slider-track: #303050;
    --slider-fill: #818cf8;
    --btn-primary-bg: linear-gradient(135deg, #6366f1 0%, #4338ca 100%);
    --btn-primary-hover: linear-gradient(135deg, #818cf8 0%, #6366f1 100%);
}

/* Ocean Theme */
[data-theme="ocean"] {
    --bg-primary: #0c1929;
    --bg-secondary: #112240;
    --bg-tertiary: #1a365d;
    --bg-hover: #234e85;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-primary: #22d3ee;
    --accent-secondary: #06b6d4;
    --bar-default: #0ea5e9;
    --bar-comparing: #f97316;
    --bar-swapping: #22d3ee;
    --bar-sorted: #10b981;
    --border-color: #1e3a5f;
    --slider-track: #1e3a5f;
    --slider-fill: #22d3ee;
    --btn-primary-bg: linear-gradient(135deg, #0ea5e9 0%, #0369a1 100%);
    --btn-primary-hover: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
}

/* Forest Theme */
[data-theme="forest"] {
    --bg-primary: #0f1a0f;
    --bg-secondary: #162016;
    --bg-tertiary: #1f2f1f;
    --bg-hover: #2a402a;
    --text-primary: #e8f5e8;
    --text-secondary: #a0c0a0;
    --text-muted: #608060;
    --accent-primary: #4ade80;
    --accent-secondary: #22c55e;
    --bar-default: #22c55e;
    --bar-comparing: #facc15;
    --bar-swapping: #f97316;
    --bar-sorted: #86efac;
    --border-color: #2a502a;
    --slider-track: #2a502a;
    --slider-fill: #4ade80;
    --btn-primary-bg: linear-gradient(135deg, #22c55e 0%, #15803d 100%);
    --btn-primary-hover: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
}

/* Sunset Theme */
[data-theme="sunset"] {
    --bg-primary: #1a1010;
    --bg-secondary: #2a1515;
    --bg-tertiary: #3a2020;
    --bg-hover: #4a2a2a;
    --text-primary: #fff5f0;
    --text-secondary: #e0b0a0;
    --text-muted: #a07060;
    --accent-primary: #fb923c;
    --accent-secondary: #f97316;
    --bar-default: #f97316;
    --bar-comparing: #ec4899;
    --bar-swapping: #fbbf24;
    --bar-sorted: #fb7185;
    --border-color: #5a3030;
    --slider-track: #5a3030;
    --slider-fill: #fb923c;
    --btn-primary-bg: linear-gradient(135deg, #f97316 0%, #c2410c 100%);
    --btn-primary-hover: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
}

/* Neon Theme */
[data-theme="neon"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-hover: #252530;
    --text-primary: #ffffff;
    --text-secondary: #c0c0ff;
    --text-muted: #8080c0;
    --accent-primary: #f0abfc;
    --accent-secondary: #e879f9;
    --bar-default: #e879f9;
    --bar-comparing: #22d3ee;
    --bar-swapping: #a3e635;
    --bar-sorted: #4ade80;
    --border-color: #404060;
    --slider-track: #404060;
    --slider-fill: #e879f9;
    --btn-primary-bg: linear-gradient(135deg, #e879f9 0%, #a21caf 100%);
    --btn-primary-hover: linear-gradient(135deg, #f0abfc 0%, #e879f9 100%);
}

/* Retro Theme */
[data-theme="retro"] {
    --bg-primary: #2d1b00;
    --bg-secondary: #3d2800;
    --bg-tertiary: #4d3500;
    --bg-hover: #5d4200;
    --text-primary: #ffedcc;
    --text-secondary: #ddc090;
    --text-muted: #aa9060;
    --accent-primary: #fbbf24;
    --accent-secondary: #f59e0b;
    --bar-default: #fbbf24;
    --bar-comparing: #ef4444;
    --bar-swapping: #22c55e;
    --bar-sorted: #f59e0b;
    --border-color: #6d4f00;
    --slider-track: #6d4f00;
    --slider-fill: #fbbf24;
    --btn-primary-bg: linear-gradient(135deg, #fbbf24 0%, #b45309 100%);
    --btn-primary-hover: linear-gradient(135deg, #fcd34d 0%, #fbbf24 100%);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-hover: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-secondary: #2563eb;
    --bar-default: #3b82f6;
    --bar-comparing: #ec4899;
    --bar-swapping: #22c55e;
    --bar-sorted: #10b981;
    --border-color: #e2e8f0;
    --slider-track: #cbd5e1;
    --slider-fill: #3b82f6;
    --btn-primary-bg: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --btn-primary-hover: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
}

/* ========== BASE STYLES ========== */

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    transition: background-color 0.3s, border-color 0.3s;
}

.logo {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 400;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Custom Array Input */
.custom-input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.875rem;
    width: 250px;
    outline: none;
    transition: all 0.2s;
}

.custom-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(103, 232, 249, 0.1);
}

.custom-input::placeholder {
    color: var(--text-muted);
}

.apply-btn {
    background: var(--accent-primary);
    border: none;
    color: var(--bg-primary);
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Volume Control */
.volume-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.volume-icon {
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
}

.volume-slider {
    width: 80px;
    height: 4px;
    background: var(--slider-track);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

.volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.volume-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.theme-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.theme-select:hover {
    border-color: var(--accent-primary);
}

.sound-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sound-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sound-btn.active {
    color: var(--accent-primary);
}

.sound-btn.muted .sound-waves {
    display: none;
}

.sound-icon {
    width: 20px;
    height: 20px;
}

.sound-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.sound-select:hover {
    border-color: var(--accent-primary);
}

/* Main Visualizer */
.visualizer-container {
    flex: 1;
    display: flex;
    align-items: flex-end;
    padding: 20px 24px;
    background: var(--bg-primary);
    min-height: 0;
    transition: background-color 0.3s;
}

#visualizer {
    width: 100%;
    height: 100%;
    background: transparent;
}

/* Compare Mode */
.compare-container {
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.compare-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.compare-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.compare-algo-select {
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 6px 12px;
    background: var(--bg-secondary);
    color: var(--accent-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    outline: none;
}

.compare-algo-select:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.compare-algo-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(103, 232, 249, 0.1);
}

.compare-header span:first-child {
    font-weight: 600;
    color: var(--accent-primary);
}

.compare-stats {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.compare-stats strong {
    color: var(--text-primary);
}

.compare-panel canvas {
    flex: 1;
    width: 100%;
}

/* Control Panel Footer */
.control-panel {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 32px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
    transition: background-color 0.3s, border-color 0.3s;
}

/* Algorithm Grid */
.algorithm-grid {
    display: grid;
    grid-template-columns: repeat(4, auto);
    gap: 4px;
}

.algo-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 14px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s;
    text-align: left;
    white-space: nowrap;
    border-left: 2px solid transparent;
}

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

.algo-btn.active {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
}

.algo-btn.compare-toggle {
    color: var(--accent-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.algo-btn.compare-toggle .arrow {
    font-size: 1rem;
}

.algo-btn.compare-toggle:hover {
    background: rgba(74, 222, 128, 0.1);
}

.algo-btn.compare-toggle.active {
    background: rgba(74, 222, 128, 0.15);
    border-left-color: var(--accent-secondary);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.action-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.action-btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--text-muted);
}

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

.action-btn.primary {
    background: var(--btn-primary-bg);
    border: none;
    color: white;
    padding: 10px 32px;
}

.action-btn.primary:hover:not(:disabled) {
    background: var(--btn-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.action-btn.danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border: none;
    color: white;
    padding: 10px 32px;
}

.action-btn.danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.action-btn.running {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.action-btn.running:hover:not(:disabled) {
    background: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.preset-buttons {
    display: flex;
    gap: 8px;
    margin-left: 16px;
    padding-left: 16px;
    border-left: 1px solid var(--border-color);
}

.preset-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 14px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.15s;
}

.preset-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

/* Slider Controls */
.slider-controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 220px;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

.slider-header span:first-child {
    color: var(--text-secondary);
}

.slider-value {
    color: var(--text-primary);
    font-weight: 500;
}

/* Custom Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--slider-track);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--slider-fill);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, background-color 0.3s;
    box-shadow: 0 0 0 3px var(--bg-secondary);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 0 3px var(--bg-secondary), 0 0 10px var(--slider-fill);
}

/* Info Button */
.action-btn.info {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    border: none;
    color: white;
    padding: 8px 16px;
    font-size: 0.85rem;
}

.action-btn.info:hover:not(:disabled) {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    transform: translateY(-1px);
}

/* Algorithm Info Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.3s;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-content h2 {
    color: var(--accent-primary);
    margin: 0 0 24px 0;
    font-size: 1.8rem;
    font-weight: 700;
}

.modal-content h3 {
    color: var(--text-primary);
    margin: 0 0 12px 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.info-section {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.info-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.info-section p {
    color: var(--text-secondary);
    margin: 8px 0;
    line-height: 1.6;
}

.info-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

.info-section span {
    color: var(--accent-secondary);
    font-weight: 500;
}

/* Scrollbar styling for modal */
.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--slider-fill);
    border-radius: 4px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* Benchmark Mode */
.benchmark-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 20px;
    overflow-y: auto;
}

.benchmark-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.benchmark-header h2 {
    color: var(--accent-primary);
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.benchmark-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.benchmark-btn {
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.benchmark-btn.primary {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
}

.benchmark-btn.primary:hover {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    transform: translateY(-1px);
}

.benchmark-btn.danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.benchmark-btn.danger:hover {
    background: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
    transform: translateY(-1px);
}

.benchmark-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
}

.benchmark-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    flex: 1;
    min-height: 0;
}

.benchmark-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    overflow-y: auto;
    padding: 4px;
}

.benchmark-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all 0.2s;
}

.benchmark-panel:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.benchmark-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.benchmark-panel .algo-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.benchmark-status {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}

.benchmark-status.waiting {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.benchmark-status.running {
    background: #3b82f6;
    color: white;
    animation: pulse 1.5s infinite;
}

.benchmark-status.done {
    background: #22c55e;
    color: white;
}

.benchmark-status.error {
    background: #ef4444;
    color: white;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.benchmark-canvas {
    width: 100%;
    height: 100px;
    background: var(--bg-primary);
    border-radius: 4px;
}

.benchmark-stats {
    display: flex;
    justify-content: space-around;
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding-top: 4px;
    border-top: 1px solid var(--border-color);
}

.benchmark-stats strong {
    color: var(--accent-secondary);
}

.benchmark-leaderboard {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
}

.benchmark-leaderboard h3 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.2rem;
    font-weight: 700;
}

.leaderboard-filters {
    display: flex;
    gap: 8px;
}

.filter-btn {
    flex: 1;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.leaderboard-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.leaderboard-item {
    display: grid;
    grid-template-columns: 40px 1fr auto;
    align-items: center;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    gap: 12px;
    transition: all 0.2s;
}

.leaderboard-item:hover {
    transform: translateX(4px);
    border-color: var(--accent-primary);
}

.leaderboard-item.rank-1 {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1) 0%, var(--bg-tertiary) 100%);
    border-color: #ffd700;
}

.leaderboard-item.rank-2 {
    background: linear-gradient(135deg, rgba(192, 192, 192, 0.1) 0%, var(--bg-tertiary) 100%);
    border-color: #c0c0c0;
}

.leaderboard-item.rank-3 {
    background: linear-gradient(135deg, rgba(205, 127, 50, 0.1) 0%, var(--bg-tertiary) 100%);
    border-color: #cd7f32;
}

.leaderboard-item .rank {
    font-size: 1.2rem;
    text-align: center;
    font-weight: 700;
}

.leaderboard-item .algo-name {
    color: var(--text-primary);
    font-weight: 600;
}

.leaderboard-item .stats {
    display: flex;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.leaderboard-item .stats span {
    white-space: nowrap;
}

/* Responsive benchmark grid */
@media (max-width: 1400px) {
    .benchmark-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1000px) {
    .benchmark-content {
        grid-template-columns: 1fr;
    }
    
    .benchmark-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--slider-fill);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform 0.15s;
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.15);
}

/* ========== STUDY MODE ========== */
.study-container {
    display: none;
    height: 100%;
    width: 100%;
    background: var(--bg-primary);
    overflow: hidden;
    gap: 0;
    flex-direction: row;
    position: relative;
}

.study-sidebar {
    width: 220px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    overflow-y: auto;
}

.study-sidebar h3 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 16px 0;
}

.study-algo-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.study-algo-btn {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.study-algo-btn:hover {
    background: var(--bg-primary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.study-algo-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.study-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
    scrollbar-gutter: stable;
}

.study-header {
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    height: 80px;
    box-sizing: border-box;
}

.study-header h2 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.study-controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

.study-btn {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.study-btn:hover {
    background: var(--bg-primary);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

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

.study-btn.primary:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

.study-speed-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.study-speed-slider {
    width: 100px;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    cursor: pointer;
}

.study-visual {
    height: 120px;
    display: flex;
    gap: 15px;
    padding: 10px 24px;
    overflow: visible;
    flex-shrink: 0;
    flex-grow: 0;
    box-sizing: border-box;
}

.study-canvas {
    flex: 2;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-height: 300px;
    display: none;
}

.study-array-display {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 15px;
    overflow: visible;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
}

.array-container {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    justify-content: center;
}

.array-element {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    transition: background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
}

.array-element.comparing {
    background: #ffc107;
    border-color: #ff9800;
    color: #000;
    box-shadow: 0 2px 8px rgba(255, 193, 7, 0.4);
}

.array-element.swapping {
    background: #f44336;
    border-color: #d32f2f;
    color: white;
    box-shadow: 0 2px 8px rgba(244, 67, 54, 0.4);
}

.array-element.sorted {
    background: var(--accent-primary);
    border-color: var(--accent-secondary);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 200, 150, 0.3);
}

.array-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 2px;
}

.study-explanation {
    width: 560px;
    flex-shrink: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    overflow: hidden;
}

.study-explanation h4 {
    color: var(--accent-primary);
    margin: 0 0 12px 0;
    font-size: 1rem;
    font-weight: 600;
}

.study-explanation p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.study-info-tabs {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    scrollbar-gutter: stable;
}

.study-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.study-tab {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.study-tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.study-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
    background: var(--bg-secondary);
}

.study-tab-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    padding-right: 41px;
}

.study-tab-panel {
    display: none;
    height: 100%;
}

.study-tab-panel.active {
    display: block;
}

.study-tab-panel h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 12px 0;
}

.study-tab-panel p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 20px 0;
}

.study-tab-panel ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.study-tab-panel li {
    color: var(--text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.study-tab-panel li:last-child {
    border-bottom: none;
}

.study-tab-panel pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin: 0;
}

.study-tab-panel code {
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
}

.complexity-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.complexity-table td {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.complexity-table td:first-child {
    font-weight: 600;
    color: var(--text-primary);
    width: 140px;
}

.complexity-table td:last-child {
    color: var(--accent-primary);
    font-family: 'Courier New', monospace;
}

/* Responsive */
@media (max-width: 1200px) {
    .control-panel {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .algorithm-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        order: 2;
    }
    
    .action-buttons {
        order: 1;
        flex-wrap: wrap;
    }
    
    .slider-controls {
        order: 3;
        flex-direction: row;
        min-width: auto;
    }
    
    .slider-group {
        flex: 1;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 10px 16px;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .logo-subtitle {
        display: none;
    }
    
    .visualizer-container {
        padding: 10px 16px;
    }
    
    .control-panel {
        padding: 12px 16px;
    }
    
    .algorithm-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .preset-buttons {
        display: none;
    }
    
    .slider-controls {
        flex-direction: column;
    }
    
    .compare-container {
        grid-template-columns: 1fr;
    }
}

/* Animation for active sorting */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.algo-btn.sorting {
    animation: pulse 1s infinite;
}

/* Theme transition */
* {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}