:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: #2a2a2a;
    --accent: #ffffff;
    --accent-muted: #404040;
    --bar-default: #4a90d9;
    --bar-compare: #f5c842;
    --bar-swap: #e74c3c;
    --bar-sorted: #2ecc71;
    --shadow: rgba(0, 0, 0, 0.5);
    --transition: 0.3s ease;
    --slider-track: #404040;
    --slider-thumb: #ffffff;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #ebebeb;
    --text-primary: #0a0a0a;
    --text-secondary: #555555;
    --text-muted: #888888;
    --border-color: #e0e0e0;
    --accent: #0a0a0a;
    --accent-muted: #cccccc;
    --bar-default: #3498db;
    --bar-compare: #f39c12;
    --bar-swap: #e74c3c;
    --bar-sorted: #27ae60;
    --shadow: rgba(0, 0, 0, 0.1);
    --slider-track: #cccccc;
    --slider-thumb: #333333;
}

/* Colorblind-friendly themes */
/* Deuteranopia (red-green, most common) */
[data-colorblind="deuteranopia"] {
    --bar-default: #0077BB;
    --bar-compare: #EE7733;
    --bar-swap: #CC3311;
    --bar-sorted: #009988;
}

/* Protanopia (red-green) */
[data-colorblind="protanopia"] {
    --bar-default: #4477AA;
    --bar-compare: #CCBB44;
    --bar-swap: #EE6677;
    --bar-sorted: #228833;
}

/* Tritanopia (blue-yellow) */
[data-colorblind="tritanopia"] {
    --bar-default: #332288;
    --bar-compare: #AA4499;
    --bar-swap: #CC6677;
    --bar-sorted: #44AA99;
}

/* Screen reader only (visually hidden but readable) */
.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;
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: background-color var(--transition), color var(--transition);
}

header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    z-index: 100;
    transition: background-color var(--transition), border-color var(--transition);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

h1 {
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle-btn {
    width: 48px;
    height: 26px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 13px;
    cursor: pointer;
    position: relative;
    transition: all var(--transition);
}

.theme-toggle-btn::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--text-primary);
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform var(--transition);
}

[data-theme="light"] .theme-toggle-btn::after {
    transform: translateX(22px);
}

.theme-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.docs-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all var(--transition);
}

.docs-link:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.auth-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all var(--transition);
}

.auth-link:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

/* User Profile */
.user-profile {
    position: relative;
}

.profile-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-tertiary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: border-color var(--transition);
}

.profile-avatar:hover {
    border-color: var(--text-muted);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
}

.profile-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 0;
    min-width: 200px;
    box-shadow: 0 4px 20px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1000;
}

.user-profile.open .profile-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.profile-info {
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.profile-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.profile-email {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.profile-dropdown hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 0.25rem 0;
}

.dropdown-item {
    width: 100%;
    padding: 0.6rem 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition);
}

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

.tabs {
    display: flex;
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    position: relative;
    isolation: isolate;
}

.tab-glider {
    position: absolute;
    top: 4px;
    left: 0;
    height: calc(100% - 8px);
    background: var(--bg-primary);
    border-radius: 6px;
    z-index: 1;
    transition: transform 0.25s cubic-bezier(0.2, 0, 0.2, 1), width 0.25s cubic-bezier(0.2, 0, 0.2, 1);
    box-shadow: 0 1px 3px var(--shadow);
    pointer-events: none;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.15s ease;
    position: relative;
    z-index: 2;
    flex: 0 0 auto;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.tab-btn:hover {
    color: var(--text-secondary);
}

.tab-btn.active {
    background: transparent;
    color: var(--text-primary);
}

.tab-btn.hover-preview {
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.controls {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.control-group label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    font-weight: 500;
}

select,
input[type="number"] {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.875rem;
    outline: none;
    transition: all var(--transition);
    cursor: pointer;
    min-width: 120px;
}

select:hover,
select:focus,
input[type="number"]:hover,
input[type="number"]:focus {
    border-color: var(--text-muted);
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 8px;
    background: var(--slider-track);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    padding: 8px 0;
    margin: 4px 0;
    touch-action: pan-x;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    transition: transform 0.15s;
    box-shadow: 0 2px 6px var(--shadow);
    border: 2px solid var(--bg-secondary);
}

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

input[type=range]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    transition: transform 0.15s;
    box-shadow: 0 2px 6px var(--shadow);
    border: 2px solid var(--bg-secondary);
}

input[type=range]::-moz-range-thumb:hover {
    transform: scale(1.1);
}

input[type=range]::-moz-range-track {
    height: 8px;
    background: var(--slider-track);
    border-radius: 4px;
}

.btn {
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all var(--transition);
}

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

.btn.primary:hover {
    opacity: 0.85;
}

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

.btn.secondary:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn.small {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
}

.btn.stop {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.btn.stop:hover:not(:disabled) {
    background: #e74c3c;
    border-color: #e74c3c;
    color: #ffffff;
}

.btn.stop:disabled {
    opacity: 0.3;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.active-section {
    display: flex !important;
    height: 100%;
    flex-direction: column;
}

#section-visualizer {
    display: none;
    position: relative;
    background: var(--bg-primary);
}

.toolbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    transition: all var(--transition);
}

.separator {
    width: 1px;
    height: 24px;
    background: var(--border-color);
}

.stats {
    display: flex;
    gap: 1.5rem;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.stats span {
    color: var(--text-primary);
    font-weight: 500;
}

.select-wrapper select {
    min-width: 180px;
}

.advanced-options {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.advanced-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 2rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all var(--transition);
}

.advanced-toggle:hover {
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

.toggle-icon {
    transition: transform 0.2s ease;
}

.advanced-options.open .toggle-icon {
    transform: rotate(180deg);
}

.advanced-content {
    display: none;
    padding: 1rem 2rem 1.25rem;
    gap: 2rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--border-color);
}

.advanced-options.open .advanced-content {
    display: flex;
}

.option-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.option-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.option-group select {
    min-width: 140px;
}

.option-group input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--bar-sorted);
}

.save-load-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
}

.save-load-buttons {
    display: flex;
    gap: 0.5rem;
}

.save-load-buttons .btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
}

/* Custom Array Upload */
.custom-array-group {
    flex-direction: column;
    align-items: flex-start !important;
    gap: 0.5rem !important;
}

.custom-array-group>label {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.custom-array-group>label small {
    font-size: 0.65rem;
    color: var(--text-muted);
    opacity: 0.8;
}

.custom-array-wrapper {
    display: flex;
    gap: 0.5rem;
}

.custom-array-wrapper input[type="text"] {
    flex: 1;
    min-width: 180px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.8rem;
    outline: none;
    transition: all var(--transition);
}

.custom-array-wrapper input[type="text"]:focus {
    border-color: var(--text-muted);
}

.custom-array-wrapper input[type="text"]::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

.custom-array-upload {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.custom-array-upload .btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.upload-hint {
    font-size: 0.65rem;
    color: var(--text-muted);
    opacity: 0.7;
}

/* Custom array mini controls for Compare and Benchmark */
.custom-array-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.custom-array-config label,
.custom-array-bench label {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
}

.custom-array-config label small,
.custom-array-bench label small {
    font-size: 0.65rem;
    color: var(--text-muted);
    opacity: 0.8;
}

.custom-status {
    font-size: 0.7rem;
    color: var(--bar-sorted);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.custom-status.error {
    color: var(--bar-swap);
}

.custom-status.loaded {
    color: var(--bar-sorted);
}

.compare-custom-indicator {
    background: var(--bg-tertiary);
    border: 1px solid var(--bar-sorted);
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--bar-sorted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.stats-panel {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    background: var(--bg-secondary);
    padding: 0.75rem 1.25rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 2rem;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    z-index: 10;
    transition: all var(--transition);
}

.stats-panel span {
    color: var(--text-primary);
    font-weight: 600;
}

#visualizer-container {
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 2.5rem 4rem 0;
    min-height: 300px;
    overflow: visible;
}

.bar {
    flex: 1;
    min-width: 1px;
    background: var(--bar-default);
    margin: 0;
    border-radius: 1px 1px 0 0;
    transition: height 0.08s ease-out, background-color 0.1s;
    opacity: 0.85;
    position: relative;
}

.bar.compare {
    background: var(--bar-compare) !important;
    opacity: 1;
}

.bar.swap {
    background: var(--bar-swap) !important;
    opacity: 1;
}

.bar.sorted {
    background: var(--bar-sorted) !important;
    opacity: 1;
}

.bar.show-value::before {
    content: attr(data-value);
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%) rotate(-90deg);
    transform-origin: center center;
    font-size: 0.6rem;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.7);
    white-space: nowrap;
    pointer-events: none;
}

.progress-container {
    width: 100%;
    max-width: calc(100% - 8rem);
    margin: 0.5rem 4rem;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    position: relative;
    display: none;
}

.progress-container.active {
    display: block;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--text-primary);
    border-radius: 2px;
    transition: width 0.1s ease-out;
}

.progress-text {
    position: absolute;
    right: 0;
    top: -18px;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    opacity: 0;
    animation: confetti-fall 3s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        opacity: 1;
        transform: translateY(-100px) rotate(0deg);
    }

    100% {
        opacity: 0;
        transform: translateY(100vh) rotate(720deg);
    }
}

.keyboard-hints {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.7rem;
    color: var(--text-muted);
    z-index: 100;
    opacity: 0.7;
    transform: translateX(0);
    transition: opacity var(--transition), transform 0.3s ease-in-out;
}

.keyboard-hints.hidden {
    transform: translateX(calc(100% + 2rem));
    opacity: 0;
    pointer-events: none;
}

.keyboard-hints:hover {
    opacity: 1;
}

.keyboard-hints kbd {
    display: inline-block;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    padding: 0.15rem 0.4rem;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.65rem;
    margin-right: 0.25rem;
}

#section-compare {
    display: none;
    padding: 2rem;
    overflow-y: auto;
    background: var(--bg-primary);
}

#section-compare.active-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.compare-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.compare-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.compare-header p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.compare-controls {
    display: flex;
    gap: 2rem;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.compare-config {
    display: flex;
    gap: 1.5rem;
}

.compare-actions {
    display: flex;
    gap: 0.75rem;
}

.race-count {
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.race-count span {
    color: var(--bar-compare);
    font-weight: 600;
}

.compare-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    width: 100%;
    max-width: 1600px;
    transition: max-width 0.3s ease;
}

/* Expand to full width when many racers (10+) */
.compare-grid.full-width {
    max-width: 100%;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.compare-grid.full-width .compare-panel {
    padding: 0.5rem;
    min-height: 200px;
}

.compare-grid.full-width .compare-visualizer {
    min-height: 120px;
}

.compare-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    min-height: 250px;
    position: relative;
}

.compare-panel .remove-panel {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    opacity: 0.6;
    transition: all 0.2s;
}

.compare-panel .remove-panel:hover {
    opacity: 1;
    background: rgba(231, 76, 60, 0.2);
    color: #e74c3c;
}

.compare-panel.winner {
    border-color: var(--bar-sorted);
    box-shadow: 0 0 20px rgba(46, 204, 113, 0.3);
}

.compare-panel.rank-1 {
    border-color: #ffd700;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
}

.compare-panel.rank-2 {
    border-color: #c0c0c0;
    box-shadow: 0 0 10px rgba(192, 192, 192, 0.3);
}

.compare-panel.rank-3 {
    border-color: #cd7f32;
    box-shadow: 0 0 10px rgba(205, 127, 50, 0.3);
}

.panel-rank {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    border: 2px solid var(--border-color);
}

.rank-1 .panel-rank {
    border-color: #ffd700;
    color: #ffd700;
}

.rank-2 .panel-rank {
    border-color: #c0c0c0;
    color: #c0c0c0;
}

.rank-3 .panel-rank {
    border-color: #cd7f32;
    color: #cd7f32;
}

.leaderboard {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    margin-top: 1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.leaderboard h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--text-primary);
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.leaderboard-table th {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.05em;
}

.leaderboard-table td {
    color: var(--text-secondary);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.leaderboard-table td:first-child {
    font-weight: 700;
    color: var(--text-primary);
}

.leaderboard-table td:nth-child(2) {
    font-family: inherit;
    color: var(--text-primary);
}

.leaderboard-table .winner-row {
    background: rgba(46, 204, 113, 0.1);
}

.leaderboard-table .winner-row td {
    color: var(--bar-sorted);
    font-weight: 600;
}

.leaderboard-table .winner-row td:first-child::before {
    content: '#1 ';
}

.compare-result.has-leaderboard {
    background: transparent;
    padding: 0;
}

.val-time {
    color: var(--accent) !important;
    font-weight: 600;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.algo-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
}

.panel-stats {
    display: flex;
    gap: 1rem;
}

.panel-stats .stat {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.compare-visualizer {
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    min-height: 250px;
    padding: 0;
    gap: 0;
    overflow: hidden;
    position: relative;
}

.compare-visualizer canvas.race-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.compare-visualizer .bar {
    flex: 1 1 0;
    min-width: 0;
    background: var(--bar-default);
    margin: 0;
    border-radius: 0;
    opacity: 0.8;
    transition: height 0.05s ease-out, background-color 0.1s;

    box-shadow: 1px 0 0 0 var(--bar-default);
}

.compare-visualizer .bar.compare {
    background: var(--bar-compare) !important;
    box-shadow: 1px 0 0 0 var(--bar-compare);
    opacity: 1;
    z-index: 10;
}

.compare-visualizer .bar.swap {
    background: var(--bar-swap) !important;
    box-shadow: 1px 0 0 0 var(--bar-swap);
    opacity: 1;
    z-index: 10;
}

.compare-visualizer .bar.sorted {
    background: var(--bar-sorted) !important;
    box-shadow: 1px 0 0 0 var(--bar-sorted);
    opacity: 1;
}

.compare-divider {
    width: 2px;
    background: var(--border-color);
    margin: 0 0.5rem;
}

.panel-status {
    text-align: center;
    padding-top: 0.75rem;
    margin-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.panel-status.running {
    color: var(--bar-compare);
}

.panel-status.done {
    color: var(--bar-sorted);
}

.compare-result {
    margin-top: 1.5rem;
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
    font-size: 1rem;
    color: var(--text-secondary);
}

.compare-result.winner-1 {
    border-color: var(--bar-sorted);
    color: var(--bar-sorted);
}

.compare-result.winner-2 {
    border-color: var(--bar-sorted);
    color: var(--bar-sorted);
}

.race-leaderboard {
    margin-top: 1.5rem;
    width: 100%;
    max-width: 600px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
}

.race-leaderboard h3 {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    transition: transform 0.2s;
}

.leaderboard-item:hover {
    transform: translateX(4px);
}

.leaderboard-rank {
    font-weight: 700;
    font-size: 1.25rem;
    min-width: 2rem;
}

.leaderboard-item:nth-child(1) .leaderboard-rank {
    color: #ffd700;
}

.leaderboard-item:nth-child(2) .leaderboard-rank {
    color: #c0c0c0;
}

.leaderboard-item:nth-child(3) .leaderboard-rank {
    color: #cd7f32;
}

.leaderboard-name {
    flex: 1;
    color: var(--text-primary);
    font-weight: 500;
}

.leaderboard-time {
    font-family: 'SF Mono', monospace;
    font-size: 0.875rem;
    color: var(--text-muted);
}

#section-benchmark {
    display: none;
    padding: 2rem;
    overflow-y: auto;
    align-items: center;
    background: var(--bg-primary);
}

.benchmark-config {
    display: flex;
    gap: 1.5rem;
    align-items: flex-end;
    margin-bottom: 2rem;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
    width: 100%;
    max-width: 1100px;
    transition: all var(--transition);
}

.config-item {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.algo-selection {
    width: 100%;
    max-width: 1100px;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    transition: all var(--transition);
}

.algo-selection h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.selection-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.algo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.algo-header h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 0.75rem;
    max-height: 180px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.checkbox-grid::-webkit-scrollbar {
    width: 4px;
}

.checkbox-grid::-webkit-scrollbar-track {
    background: transparent;
}

.checkbox-grid::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.checkbox-item input[type="checkbox"] {
    width: 14px;
    height: 14px;
    cursor: pointer;
    accent-color: var(--text-primary);
}

.table-controls {
    width: 100%;
    max-width: 1100px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.rows-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pagination {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.results-container {
    width: 100%;
    max-width: 1100px;
    overflow-x: auto;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all var(--transition);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 0.875rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-tertiary);
    font-weight: 500;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

th.sortable {
    cursor: pointer;
    user-select: none;
    transition: all var(--transition);
}

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

th.sortable.active {
    color: var(--text-primary);
}

th.sortable .sort-arrow {
    opacity: 0.3;
    margin-left: 0.25rem;
    font-size: 0.6rem;
}

th.sortable.active .sort-arrow {
    opacity: 1;
}

th.sortable.asc .sort-arrow {
    display: inline-block;
    transform: rotate(180deg);
}

td {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-family: 'SF Mono', 'Consolas', monospace;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: var(--bg-tertiary);
}

tr:nth-child(1) td:first-child {
    color: var(--text-primary);
    font-weight: 600;
}

tr:nth-child(2) td:first-child {
    color: var(--text-secondary);
}

tr:nth-child(3) td:first-child {
    color: var(--text-muted);
}

td:nth-child(3) {
    font-weight: 600;
}

.benchmark-export {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    width: 100%;
    max-width: 1100px;
}

.benchmark-export .btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.benchmark-export .btn:not(:disabled):hover {
    background: var(--bar-sorted);
    border-color: var(--bar-sorted);
    color: #fff;
}

#section-analytics {
    display: none;
    padding: 2rem;
    overflow-y: auto;
    background: var(--bg-primary);
}

.analytics-header {
    text-align: center;
    margin-bottom: 2rem;
}

.analytics-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.analytics-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.analytics-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all var(--transition);
}

.analytics-card:hover {
    border-color: var(--text-muted);
}

.analytics-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card-description {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.complexity-card {
    grid-column: span 1;
}

.complexity-chart {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    height: 250px;
    position: relative;
}

.complexity-chart canvas {
    width: 100% !important;
    height: 100% !important;
}

.complexity-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.benchmark-chart-card {
    grid-column: span 1;
}

.benchmark-chart {
    height: 200px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 0.5rem;
}

.benchmark-chart canvas {
    width: 100% !important;
    height: 100% !important;
}

.chart-note {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.info-card {
    grid-column: span 1;
}

.algo-selector {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.algo-selector label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.algo-info-content {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.25rem;
}

.algo-info-content .info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.algo-info-content .info-row:last-child {
    border-bottom: none;
}

.algo-info-content .info-label {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.algo-info-content .info-value {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.85rem;
    font-family: 'SF Mono', 'Consolas', monospace;
}

.algo-info-content .algo-description {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.stats-card {
    grid-column: span 1;
}

.session-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-item {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.export-card {
    grid-column: span 1;
}

.export-options {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.export-options .btn {
    flex: 1;
}

.export-note {
    text-align: center;
    color: var(--text-muted);
}

.export-note small {
    font-size: 0.75rem;
}

.compare-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.complexity-chart,
.benchmark-chart {
    width: 100%;
    min-height: 200px;
    aspect-ratio: 16 / 9;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0.5rem;
    }

    h1 {
        font-size: 1.25rem;
        margin: 0;
    }

    .header-actions {
        gap: 0.5rem;
    }

    .tabs {
        overflow-x: auto;
        white-space: nowrap;
        padding: 0 0 0.5rem 0;
        margin-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start;
        border-bottom: 2px solid var(--border-color);
    }

    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
        flex: 0 0 auto;
    }

    .toolbar .controls {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
        align-items: center;
    }

    .control-group:nth-child(1),
    .control-group:nth-child(2) {
        grid-column: span 2;
    }

    .control-group {
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    .control-group.stats {
        grid-column: span 2;
        flex-direction: row;
        justify-content: space-around;
        background: var(--bg-secondary);
        padding: 0.5rem;
        border-radius: 4px;
        font-size: 0.8rem;
        margin: 0;
    }

    .control-group:last-child {
        grid-column: span 2;
        flex-direction: row;
        gap: 0.5rem;
    }

    .btn {
        flex: 1;
        min-height: 40px;
        font-size: 0.9rem;
        padding: 0.5rem;
    }

    input[type="range"] {
        height: 6px;
        margin: 12px 0;
        width: 100%;
    }

    input[type="range"]::-webkit-slider-thumb {
        width: 20px;
        height: 20px;
        margin-top: -7px;
    }


    #visualizer-container {
        padding: 0.5rem;
        flex-grow: 1;
        min-height: 60vh;
    }

    .separator {
        display: none;
    }

    .keyboard-hints {
        display: none;
    }

    .advanced-options {
        margin-top: 0.5rem;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    .toolbar .controls {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1rem;
    }

    .separator {
        display: none;
    }

    #visualizer-container {
        padding: 2rem 2rem 0;
        min-height: 400px;
    }
}

@media (max-width: 480px) {
    main {
        padding: 0.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .checkbox-grid {
        grid-template-columns: 1fr;
    }

    .control-group {
        width: 100%;
    }

    .control-group label {
        font-size: 0.8rem;
    }

    .benchmark-config,
    .algo-selection,
    .table-controls {
        padding: 0.75rem;
    }

    .compare-grid {
        grid-template-columns: 1fr;
    }

    .analytics-grid {
        grid-template-columns: 1fr;
    }

    .compare-controls {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .compare-config {
        flex-direction: column;
        gap: 0.75rem;
        width: 100%;
    }

    .compare-actions {
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
    }

    .compare-actions .btn {
        flex: 1;
        min-width: 80px;
    }

    .compare-panel {
        min-height: 200px;
        padding: 0.75rem;
    }

    .compare-visualizer {
        min-height: 150px;
    }

    .panel-header {
        gap: 0.25rem;
    }

    .algo-select {
        font-size: 0.8rem;
        padding: 0.3rem;
    }

    .panel-stats {
        font-size: 0.65rem;
    }

    .race-timer {
        font-size: 1rem;
        padding: 0.3rem 0.75rem;
    }

    .leaderboard {
        padding: 1rem;
    }

    .leaderboard-item {
        padding: 0.5rem 0.75rem;
        gap: 0.5rem;
    }
}

.benchmark-progress {
    width: 100%;
    max-width: 1100px;
    margin-bottom: 1.5rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all var(--transition);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.progress-status {
    display: flex;
    align-items: center;
}

#progress-status-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.progress-stats {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-percent {
    font-size: 1.25rem;
    font-weight: 600;
    font-family: 'SF Mono', 'Consolas', monospace;
    color: var(--bar-sorted);
}

.progress-step {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'SF Mono', 'Consolas', monospace;
    padding: 0.2rem 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.progress-bar-wrapper {
    margin: 0.75rem 0;
}

.progress-bar-track {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--text-primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-current-algo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.current-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.current-algo-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    padding: 0.2rem 0.6rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.benchmark-progress.complete .progress-bar-fill {
    background: var(--bar-sorted);
}

.benchmark-progress.complete .current-algo-name {
    color: var(--bar-sorted);
    border-color: var(--bar-sorted);
}

.compare-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    width: 100%;
    margin-top: 1rem;
    padding-bottom: 2rem;
}

.compare-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    min-height: 350px;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
}

.compare-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.compare-visualizer {
    flex: 1;
    min-height: 220px;
    display: flex;
    align-items: flex-end;
    padding-bottom: 5px;
}

.panel-header {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-right: 1.5rem;
}

.algo-select {
    flex: 1;
    min-width: 140px;
    font-size: 0.85rem;
    padding: 0.4rem;
}

.panel-stats {
    display: flex;
    gap: 0.75rem;
    font-size: 0.7rem;
}

.remove-panel-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    padding: 0;
}

.remove-panel-btn:hover {
    background: rgba(231, 76, 60, 0.1);
    color: #e74c3c;
}

#section-custom {
    display: none;
    padding: 0 2rem 2rem 2rem;
    width: 100%;
    margin: 0 auto;
    flex: 1;
    overflow: hidden;
}

#section-custom.active-section {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.custom-header {
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.custom-workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    flex: 1;
    min-height: 0;
}

@media (max-width: 900px) {
    .custom-workspace {
        grid-template-columns: 1fr;
    }
}

.editor-pane {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.editor-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.editor-actions {
    display: flex;
    gap: 0.5rem;
}

.editor-wrapper {
    flex: 1;
    position: relative;
    background: #0d1117;
}

#custom-code-editor {
    width: 100%;
    height: 100%;
    background: transparent;
    color: #e6edf3;
    border: none;
    resize: none;
    padding: 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    outline: none;
    tab-size: 4;
}

.editor-help {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.75rem;
}

.editor-help code {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
    color: var(--text-primary);
}

.visualizer-pane {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    min-height: 0;
    overflow: hidden;
}

.custom-controls {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.custom-stats {
    display: flex;
    gap: 1.5rem;
    margin-left: auto;
    font-feature-settings: "tnum";
    font-variant-numeric: tabular-nums;
}

.custom-stats b {
    color: var(--text-primary);
}

.custom-vis-box {
    flex: 1;
    min-height: 200px;
    /* Ensure minimum visible height for bars */
    background: var(--bg-main);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 0 10px;
}

.error-box {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid #e74c3c;
    color: #e74c3c;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-break: break-word;
}

#section-step {
    display: none;
    padding: 1.5rem;
    height: 100%;
    overflow-y: auto;
}

#section-step.active-section {
    display: flex;
    flex-direction: column;
}

.step-header {
    text-align: center;
    margin-bottom: 1rem;
}

.step-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.step-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.step-controls {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
    justify-content: space-between;
}

.step-config {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.step-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.step-info {
    background: var(--bg-tertiary);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.step-counter {
    font-size: 1.25rem;
    font-weight: 600;
}

.step-description {
    flex: 1;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

.step-stats {
    display: flex;
    gap: 1.5rem;
}

.step-split-container {
    display: flex;
    flex-wrap: nowrap;
    gap: 1.5rem;
    margin-bottom: 1rem;
    align-items: stretch;
    flex: 1;
    min-height: 0;
}

.step-vis-pane {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.step-code-pane {
    flex: 0 0 320px;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    height: 100%;
    max-height: 500px;
}

.pseudocode-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.pseudocode-title {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pseudocode-complexity {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.8rem;
    color: var(--bar-compare);
    background: rgba(245, 200, 66, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.pseudocode-container {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
    font-size: 0.8rem;
    line-height: 1.8;
}

.pseudocode-line {
    display: flex;
    padding: 0.15rem 1rem;
    transition: background 0.2s, border-color 0.2s;
    border-left: 3px solid transparent;
}

.pseudocode-line.active {
    background: rgba(245, 200, 66, 0.15);
    border-left-color: var(--bar-compare);
}

.pseudocode-line.executed {
    opacity: 0.6;
}

.pseudocode-line.active.executed {
    opacity: 1;
}

.line-number {
    width: 28px;
    color: var(--text-muted);
    user-select: none;
    text-align: right;
    margin-right: 1rem;
    flex-shrink: 0;
}

.line-content {
    flex: 1;
    color: var(--text-primary);
    white-space: pre;
}

.line-content .keyword {
    color: #c678dd;
}

.line-content .function {
    color: #61afef;
}

.line-content .variable {
    color: #e5c07b;
}

.line-content .comment {
    color: var(--text-muted);
    font-style: italic;
}

.line-content .operator {
    color: #56b6c2;
}

.pseudocode-footer {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.code-legend {
    display: flex;
    gap: 1.5rem;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.code-legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.code-dot {
    width: 8px;
    height: 8px;
    border-radius: 2px;
}

.code-dot.active {
    background: var(--bar-compare);
}

.code-dot.executed {
    background: var(--text-muted);
    opacity: 0.5;
}

@media (max-width: 1100px) {
    .step-split-container {
        flex-wrap: wrap;
    }

    .step-code-pane {
        flex: 1 1 100%;
        max-width: 100%;
        max-height: 300px;
        order: 2;
    }

    .step-vis-pane {
        flex: 1 1 100%;
        order: 1;
    }

    .step-visualizer {
        min-height: 300px;
    }
}

.step-visualizer {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    flex: 1;
    min-height: 350px;
    width: 100%;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 1.5rem;
    gap: 4px;
    margin-bottom: 1rem;
}

.step-visualizer .bar {
    flex: 1;
    min-width: 8px;
    max-width: 60px;
    background: var(--bar-default);
    border-radius: 4px 4px 0 0;
    transition: all 0.3s ease;
    position: relative;
}

.step-visualizer .bar.compare {
    background: var(--bar-compare) !important;
}

.step-visualizer .bar.swap {
    background: var(--bar-swap) !important;
}

.step-visualizer .bar.sorted {
    background: var(--bar-sorted) !important;
}

.step-visualizer .bar::after {
    content: attr(data-value);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    padding: 2px 4px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    opacity: 0;
    transition: opacity 0.2s;
}

.step-visualizer .bar:hover::after {
    opacity: 1;
}

.step-legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 3px;
}

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

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

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

.step-bookmarks {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.step-bookmarks h4 {
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.bookmark-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 0.75rem;
}

.bookmark-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.8rem;
}

.bookmark-step {
    font-weight: 600;
    color: var(--bar-compare);
    min-width: 60px;
}

.bookmark-desc {
    flex: 1;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bookmark-goto,
.bookmark-remove {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
}

.bookmark-remove {
    color: var(--text-muted);
}

.bookmark-remove:hover {
    color: var(--bar-swap);
}

.visualizer-3d #visualizer-container,
.visualizer-3d .step-visualizer,
.visualizer-3d .compare-visualizer {
    perspective: 1000px;
    transform-style: preserve-3d;
}

.visualizer-3d .bar {
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(-10deg) rotateY(-15deg);
    background: linear-gradient(180deg,
            var(--bar-default) 0%,
            color-mix(in srgb, var(--bar-default) 70%, black) 100%);
    border-radius: 2px 2px 0 0;
}

.visualizer-3d .bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 100%;
    width: 12px;
    height: 100%;
    background: linear-gradient(90deg,
            color-mix(in srgb, var(--bar-default) 60%, black) 0%,
            color-mix(in srgb, var(--bar-default) 40%, black) 100%);
    transform: skewY(-45deg);
    transform-origin: top left;
}

.visualizer-3d .bar::after {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 0;
    width: 100%;
    height: 12px;
    background: linear-gradient(180deg,
            color-mix(in srgb, var(--bar-default) 90%, white) 0%,
            var(--bar-default) 100%);
    transform: skewX(-45deg);
    transform-origin: bottom left;
}

.visualizer-3d .bar.compare {
    background: linear-gradient(180deg,
            var(--bar-compare) 0%,
            color-mix(in srgb, var(--bar-compare) 70%, black) 100%);
}

.visualizer-3d .bar.compare::before {
    background: linear-gradient(90deg,
            color-mix(in srgb, var(--bar-compare) 60%, black) 0%,
            color-mix(in srgb, var(--bar-compare) 40%, black) 100%);
}

.visualizer-3d .bar.compare::after {
    background: linear-gradient(180deg,
            color-mix(in srgb, var(--bar-compare) 90%, white) 0%,
            var(--bar-compare) 100%);
}

.visualizer-3d .bar.swap {
    background: linear-gradient(180deg,
            var(--bar-swap) 0%,
            color-mix(in srgb, var(--bar-swap) 70%, black) 100%);
}

.visualizer-3d .bar.swap::before {
    background: linear-gradient(90deg,
            color-mix(in srgb, var(--bar-swap) 60%, black) 0%,
            color-mix(in srgb, var(--bar-swap) 40%, black) 100%);
}

.visualizer-3d .bar.swap::after {
    background: linear-gradient(180deg,
            color-mix(in srgb, var(--bar-swap) 90%, white) 0%,
            var(--bar-swap) 100%);
}

.visualizer-3d .bar.sorted {
    background: linear-gradient(180deg,
            var(--bar-sorted) 0%,
            color-mix(in srgb, var(--bar-sorted) 70%, black) 100%);
}

.visualizer-3d .bar.sorted::before {
    background: linear-gradient(90deg,
            color-mix(in srgb, var(--bar-sorted) 60%, black) 0%,
            color-mix(in srgb, var(--bar-sorted) 40%, black) 100%);
}

.visualizer-3d .bar.sorted::after {
    background: linear-gradient(180deg,
            color-mix(in srgb, var(--bar-sorted) 90%, white) 0%,
            var(--bar-sorted) 100%);
}

.visualizer-3d #visualizer-container,
.visualizer-3d .step-visualizer {
    padding: 20px 30px 10px 10px;
}

.custom-array-group {
    margin-top: 0.5rem;
}

.custom-array-wrapper {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.custom-array-wrapper input[type="text"] {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.custom-array-wrapper input[type="text"]::placeholder {
    color: var(--text-muted);
}

.race-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    min-width: 120px;
    justify-content: center;
}

#race-elapsed {
    color: var(--bar-compare);
}

.swipe-hint {
    display: none;
    text-align: center;
    padding: 0.5rem;
    color: var(--text-muted);
    font-size: 0.75rem;
}

@media (max-width: 768px) {
    .swipe-hint {
        display: block;
    }
}

*:focus-visible {
    outline: 2px solid var(--bar-compare);
    outline-offset: 2px;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 2px solid var(--bar-compare);
    outline-offset: 2px;
}

.tab-btn:focus-visible {
    outline: 2px solid var(--bar-compare);
    outline-offset: -2px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--bar-compare);
    color: var(--bg-primary);
    padding: 8px 16px;
    z-index: 1000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

.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;
}

.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
    max-width: 400px;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    pointer-events: auto;
    animation: toastSlideIn 0.3s ease-out;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.toast.toast-exit {
    animation: toastSlideOut 0.3s ease-in forwards;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastSlideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.toast-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

.toast-content {
    flex: 1;
    min-width: 0;
}

.toast-title {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.toast-message {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    word-break: break-word;
}

.toast-close {
    flex-shrink: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1.2rem;
    line-height: 1;
    opacity: 0.6;
    transition: opacity 0.15s;
}

.toast-close:hover {
    opacity: 1;
}

.toast.toast-error .toast-icon {
    background: rgba(231, 76, 60, 0.2);
    color: #e74c3c;
}

.toast.toast-warning .toast-icon {
    background: rgba(243, 156, 18, 0.2);
    color: #f39c12;
}

.toast.toast-success .toast-icon {
    background: rgba(39, 174, 96, 0.2);
    color: #27ae60;
}

.toast.toast-info .toast-icon {
    background: rgba(52, 152, 219, 0.2);
    color: #3498db;
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--text-muted);
    border-radius: 0 0 12px 12px;
    animation: toastProgress linear forwards;
}

@keyframes toastProgress {
    from {
        width: 100%;
    }

    to {
        width: 0;
    }
}

@media (max-width: 480px) {
    .toast-container {
        left: 1rem;
        right: 1rem;
        max-width: none;
    }
}

/* ==================== SHARED BY BANNER ==================== */
.shared-by-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.15));
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.shared-by-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.shared-by-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(139, 92, 246, 0.5);
}

.shared-by-content span {
    color: var(--text-primary);
    font-size: 0.9rem;
}

.shared-by-content strong {
    color: #a78bfa;
}

.shared-by-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
    transition: color 0.2s;
}

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