/* DSA Visualizer - Complete Styles with Light/Dark Theme Support */

/* ===== CSS Variables ===== */
.dsa-visualizer-container {
    --dsa-primary: var(--primary-color, #3498db);
    --dsa-secondary: var(--secondary-color, #2ecc71);
    --dsa-bg: var(--card-bg-color, #fcfcfc);
    --dsa-surface: var(--background-color, #ffffff);
    --dsa-text: var(--text-color, #333333);
    --dsa-text-muted: #6c757d;
    --dsa-border: var(--border-color, rgba(52, 152, 219, 0.15));
    --dsa-shadow: var(--box-shadow, 0 4px 6px rgba(0, 0, 0, 0.1));
    --dsa-radius: var(--border-radius-md, 8px);
    --dsa-radius-lg: var(--border-radius-lg, 16px);
    --dsa-transition: var(--transition-fast, 0.2s ease);
    --dsa-gradient: linear-gradient(135deg, var(--dsa-primary), var(--dsa-secondary));
    --dsa-success: #27ae60;
    --dsa-warning: #f39c12;
    --dsa-danger: #e74c3c;
    --dsa-info: #3498db;
    --dsa-node-bg: linear-gradient(145deg, #667eea, #764ba2);
    --dsa-node-text: #ffffff;
    --dsa-pointer-color: #e74c3c;
    --dsa-arrow-color: #3498db;
}

.dark-theme .dsa-visualizer-container {
    --dsa-text-muted: #9ca3af;
    --dsa-surface: #1a1d24;
    --dsa-bg: #242830;
    --dsa-node-bg: linear-gradient(145deg, #7c3aed, #ec4899);
}

/* ===== Base Container ===== */
.dsa-visualizer-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem;
    font-family: var(--font-family, 'Inter', sans-serif);
    color: var(--dsa-text);
}

/* ===== Header ===== */
.dsa-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--secondary-rgb), 0.05));
    border-radius: var(--dsa-radius-lg);
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.dsa-header-content {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.dsa-header-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dsa-gradient);
    border-radius: var(--dsa-radius-lg);
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.35);
}

.dsa-header h2 {
    margin: 0 0 0.25rem 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.dsa-header p {
    margin: 0;
    opacity: 0.7;
    font-size: 0.9rem;
}

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

.dsa-btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--dsa-border);
    border-radius: 12px;
    background: var(--dsa-surface);
    color: var(--dsa-text);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dsa-btn-icon:hover {
    border-color: var(--dsa-primary);
    color: var(--dsa-primary);
}

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

/* ===== Privacy Notice ===== */
.dsa-privacy-notice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--dsa-radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.1), rgba(52, 152, 219, 0.1));
    border: 1px solid rgba(39, 174, 96, 0.2);
    color: var(--dsa-success);
}

/* ===== Structure Tabs ===== */
.dsa-structure-tabs {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.dsa-structure-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 1rem 2rem;
    border: 2px solid var(--dsa-border);
    background: var(--dsa-surface);
    border-radius: var(--dsa-radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 120px;
}

.dsa-structure-tab i {
    font-size: 1.5rem;
    color: var(--dsa-primary);
}

.dsa-structure-tab span {
    font-weight: 600;
    color: var(--dsa-text);
}

.dsa-structure-tab small {
    font-size: 0.75rem;
    color: var(--dsa-text-muted);
}

.dsa-structure-tab:hover {
    border-color: var(--dsa-primary);
    transform: translateY(-2px);
}

.dsa-structure-tab.active {
    background: var(--dsa-gradient);
    border-color: transparent;
    box-shadow: 0 8px 25px rgba(var(--primary-rgb), 0.35);
}

.dsa-structure-tab.active i,
.dsa-structure-tab.active span,
.dsa-structure-tab.active small {
    color: white;
}

/* ===== Main Content Layout ===== */
.dsa-main-content {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

/* ===== Controls Panel ===== */
.dsa-controls-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dsa-control-section {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    padding: 1.25rem;
}

.dsa-control-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--dsa-text);
}

.dsa-control-section h4 i {
    color: var(--dsa-primary);
}

/* ===== Input Styles ===== */
.dsa-input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.dsa-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--dsa-border);
    border-radius: var(--dsa-radius);
    background: var(--dsa-surface);
    color: var(--dsa-text);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.dsa-input:focus {
    outline: none;
    border-color: var(--dsa-primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

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

.dsa-input-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
}

.dsa-input-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.dsa-input-row .dsa-input-sm {
    flex: 1;
    min-width: 50px;
}

.dsa-batch-input,
.dsa-random-gen {
    margin-top: 1rem;
}

.dsa-batch-input label,
.dsa-random-gen label,
.dsa-position-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--dsa-text-muted);
    margin-bottom: 0.5rem;
}

/* ===== Button Styles ===== */
.dsa-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--dsa-radius);
    border: none;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.dsa-btn-primary {
    background: var(--dsa-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
}

.dsa-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
}

.dsa-btn-secondary {
    background: var(--dsa-bg);
    color: var(--dsa-text);
    border: 2px solid var(--dsa-border);
}

.dsa-btn-secondary:hover {
    background: rgba(var(--primary-rgb), 0.1);
    border-color: var(--dsa-primary);
}

.dsa-btn-outline {
    background: transparent;
    color: var(--dsa-primary);
    border: 2px solid var(--dsa-primary);
}

.dsa-btn-outline:hover {
    background: var(--dsa-primary);
    color: white;
}

.dsa-btn-danger {
    background: var(--dsa-danger);
    color: white;
}

.dsa-btn-danger:hover {
    background: #c0392b;
}

.dsa-btn-full {
    width: 100%;
}

.dsa-btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* ===== Operations ===== */
.dsa-operations-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.dsa-btn-operation {
    flex: 1 1 calc(50% - 0.25rem);
    padding: 0.6rem 0.75rem;
    font-size: 0.8rem;
    background: var(--dsa-surface);
    color: var(--dsa-text);
    border: 1px solid var(--dsa-border);
}

.dsa-btn-operation:hover {
    background: rgba(var(--primary-rgb), 0.1);
    border-color: var(--dsa-primary);
    color: var(--dsa-primary);
}

.dsa-btn-operation.dsa-btn-danger {
    border-color: var(--dsa-danger);
    color: var(--dsa-danger);
    background: rgba(231, 76, 60, 0.1);
}

.dsa-btn-operation.dsa-btn-danger:hover {
    background: var(--dsa-danger);
    color: white;
}

.dsa-common-ops {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* ===== Checkbox Styles ===== */
.dsa-checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--dsa-text);
    margin-top: 0.75rem;
}

.dsa-checkbox-label input {
    display: none;
}

.dsa-checkbox-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--dsa-border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.dsa-checkbox-label input:checked+.dsa-checkbox-custom {
    background: var(--dsa-primary);
    border-color: var(--dsa-primary);
}

.dsa-checkbox-label input:checked+.dsa-checkbox-custom::after {
    content: '✓';
    color: white;
    font-size: 0.7rem;
}

/* ===== Speed Control ===== */
.dsa-speed-control label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--dsa-text-muted);
}

.dsa-speed-buttons {
    display: flex;
    gap: 0.25rem;
}

.dsa-speed-btn {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--dsa-border);
    background: var(--dsa-surface);
    color: var(--dsa-text);
    border-radius: var(--dsa-radius);
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s ease;
}

.dsa-speed-btn:hover {
    border-color: var(--dsa-primary);
}

.dsa-speed-btn.active {
    background: var(--dsa-primary);
    color: white;
    border-color: var(--dsa-primary);
}

.dsa-step-controls,
.dsa-playback-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.dsa-step-controls .dsa-btn,
.dsa-playback-controls .dsa-btn {
    flex: 1;
}

/* ===== Visualization Panel ===== */
.dsa-visualization-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dsa-canvas-container {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    overflow: hidden;
    min-height: 400px;
}

.dsa-canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-bottom: 1px solid var(--dsa-border);
}

.dsa-canvas-header span {
    font-weight: 600;
    color: var(--dsa-text);
}

.dsa-canvas-info {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--dsa-text-muted);
}

.dsa-separator {
    opacity: 0.5;
}

/* ===== Visualization Areas ===== */
.dsa-visualization {
    display: none;
    padding: 2rem;
    min-height: 350px;
}

.dsa-visualization.active {
    display: block;
}

.dsa-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 280px;
    color: var(--dsa-text-muted);
    text-align: center;
}

.dsa-empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.dsa-empty-state p {
    margin: 0;
    font-size: 1.1rem;
}

.dsa-empty-state small {
    opacity: 0.7;
}

/* ===== Stack Visualization ===== */
.dsa-stack-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 1rem;
    height: 100%;
}

.dsa-stack-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.dsa-stack-elements {
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    min-height: 200px;
    width: 120px;
    border: 3px solid var(--dsa-border);
    border-top: none;
    border-radius: 0 0 var(--dsa-radius) var(--dsa-radius);
    padding: 0.5rem;
    gap: 0.25rem;
    position: relative;
}

.dsa-stack-element {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--dsa-node-bg);
    color: var(--dsa-node-text);
    border-radius: var(--dsa-radius);
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    animation: stackPush 0.4s ease-out;
    transition: all 0.3s ease;
}

.dsa-stack-element.comparing {
    box-shadow: 0 0 0 3px var(--dsa-warning), 0 4px 10px rgba(0, 0, 0, 0.2);
}

.dsa-stack-element.removing {
    animation: stackPop 0.4s ease-out forwards;
}

.dsa-stack-element.highlight {
    box-shadow: 0 0 0 3px var(--dsa-success), 0 4px 10px rgba(0, 0, 0, 0.2);
}

@keyframes stackPush {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

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

@keyframes stackPop {
    from {
        opacity: 1;
        transform: translateY(0);
    }

    to {
        opacity: 0;
        transform: translateY(-50px);
    }
}

.dsa-stack-base {
    background: linear-gradient(135deg, #4a5568, #2d3748);
    color: white;
    padding: 0.5rem 2rem;
    border-radius: 0 0 var(--dsa-radius) var(--dsa-radius);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.dsa-pointer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--dsa-pointer-color);
    color: white;
    border-radius: var(--dsa-radius);
    font-weight: 600;
    font-size: 0.8rem;
    animation: pointerBounce 1s infinite;
}

@keyframes pointerBounce {

    0%,
    100% {
        transform: translateX(0);
    }

    50% {
        transform: translateX(5px);
    }
}

.dsa-top-pointer {
    position: absolute;
    left: -80px;
}

.dsa-stack-indices {
    display: flex;
    flex-direction: column-reverse;
    gap: 0.25rem;
    padding: 0.5rem;
    font-size: 0.8rem;
    color: var(--dsa-text-muted);
}

/* ===== Queue Visualization ===== */
.dsa-queue-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    align-items: center;
    justify-content: center;
}

.dsa-queue-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    min-height: 150px;
    width: 100%;
    overflow-x: auto;
}

.dsa-queue-elements {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 0;
    padding: 1.5rem 2rem;
    border: 3px solid var(--dsa-border);
    border-radius: var(--dsa-radius);
    min-width: 200px;
    min-height: 80px;
    align-items: center;
    justify-content: flex-start;
    background: rgba(var(--primary-rgb), 0.02);
}

.dsa-queue-element {
    padding: 1rem 1.5rem;
    background: var(--dsa-node-bg);
    color: var(--dsa-node-text);
    border-radius: var(--dsa-radius);
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    animation: queueEnqueue 0.4s ease-out;
    transition: all 0.3s ease;
    flex-shrink: 0;
    margin-right: 0.75rem;
    position: relative;
}

.dsa-queue-element:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid var(--dsa-arrow-color);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
}

.dsa-queue-element.removing {
    animation: queueDequeue 0.4s ease-out forwards;
}

.dsa-queue-element.highlight {
    box-shadow: 0 0 0 3px var(--dsa-success), 0 4px 10px rgba(0, 0, 0, 0.2);
}

@keyframes queueEnqueue {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

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

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

    to {
        opacity: 0;
        transform: translateX(-50px);
    }
}

.dsa-queue-pointers {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 600px;
    padding: 0 2rem;
    margin-bottom: 1rem;
}

.dsa-front-pointer,
.dsa-rear-pointer {
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: pointerBounceDown 1s infinite;
}

@keyframes pointerBounceDown {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(5px);
    }
}

.dsa-front-pointer i,
.dsa-rear-pointer i {
    margin-top: 0.25rem;
}

.dsa-queue-indices {
    display: flex;
    flex-direction: row;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    color: var(--dsa-text-muted);
    justify-content: center;
    margin-top: 0.5rem;
}

.dsa-circular-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    padding: 0.5rem 1rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: var(--dsa-radius);
    font-size: 0.85rem;
    color: var(--dsa-primary);
    margin-top: 1rem;
}

/* ===== Linked List Visualization ===== */
.dsa-linkedlist-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1rem;
    align-items: center;
}

.dsa-linkedlist-header {
    display: flex;
    justify-content: flex-start;
    padding: 0.5rem 2rem;
    width: 100%;
    max-width: 100%;
}

.dsa-linkedlist-elements {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 0;
    align-items: center;
    justify-content: flex-start;
    min-height: 120px;
    padding: 1.5rem 2rem;
    overflow-x: auto;
    overflow-y: hidden;
    width: 100%;
    max-width: 100%;
    scrollbar-width: thin;
    scrollbar-color: var(--dsa-primary) var(--dsa-border);
}

.dsa-linkedlist-elements::-webkit-scrollbar {
    height: 8px;
}

.dsa-linkedlist-elements::-webkit-scrollbar-track {
    background: var(--dsa-border);
    border-radius: 4px;
}

.dsa-linkedlist-elements::-webkit-scrollbar-thumb {
    background: var(--dsa-primary);
    border-radius: 4px;
}

.dsa-linkedlist-node {
    display: flex;
    flex-direction: row;
    align-items: center;
    animation: nodeAppear 0.4s ease-out;
    flex-shrink: 0;
}

@keyframes nodeAppear {
    from {
        opacity: 0;
        transform: scale(0.5);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.dsa-node-content {
    display: flex;
    flex-direction: row;
    border-radius: var(--dsa-radius);
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.dsa-node-data {
    padding: 1rem 1.5rem;
    background: var(--dsa-node-bg);
    color: var(--dsa-node-text);
    font-weight: 600;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 50px;
}

.dsa-node-next {
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.25);
    color: var(--dsa-node-text);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dsa-node-prev {
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.25);
    color: var(--dsa-node-text);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dsa-node-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.75rem;
    color: var(--dsa-arrow-color);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.dsa-node-arrow i {
    animation: arrowPulse 1.5s infinite;
}

@keyframes arrowPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.dsa-node-null {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 1.5rem;
    background: rgba(var(--primary-rgb), 0.1);
    border: 2px dashed var(--dsa-border);
    border-radius: var(--dsa-radius);
    color: var(--dsa-text-muted);
    font-weight: 600;
    flex-shrink: 0;
}

.dsa-linkedlist-node.highlight .dsa-node-content {
    box-shadow: 0 0 0 3px var(--dsa-success), 0 4px 15px rgba(0, 0, 0, 0.2);
}

.dsa-linkedlist-node.removing {
    animation: nodeRemove 0.4s ease-out forwards;
}

@keyframes nodeRemove {
    from {
        opacity: 1;
        transform: scale(1);
    }

    to {
        opacity: 0;
        transform: scale(0.5);
    }
}

.dsa-linkedlist-footer {
    display: flex;
    justify-content: flex-end;
    padding: 0.5rem 2rem;
    width: 100%;
    max-width: 100%;
}

.dsa-head-pointer {
    animation: pointerBounceDown 1s infinite;
}

.dsa-tail-pointer {
    animation: pointerBounceUp 1s infinite;
}

@keyframes pointerBounceUp {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

/* ===== Operation Message ===== */
.dsa-operation-message {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.5rem;
    background: var(--dsa-bg);
    border: 1px solid var(--dsa-border);
    border-radius: var(--dsa-radius);
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    display: none;
    z-index: 10;
}

.dsa-operation-message.success {
    border-color: var(--dsa-success);
    color: var(--dsa-success);
}

.dsa-operation-message.error {
    border-color: var(--dsa-danger);
    color: var(--dsa-danger);
}

.dsa-operation-message.info {
    border-color: var(--dsa-info);
    color: var(--dsa-info);
}

.dsa-operation-message.show {
    display: block;
    animation: messageSlide 0.3s ease-out;
}

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ===== Complexity Panel ===== */
.dsa-complexity-panel {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    padding: 1.25rem;
}

.dsa-complexity-panel h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 0.95rem;
    color: var(--dsa-text);
}

.dsa-complexity-panel h4 i {
    color: var(--dsa-primary);
}

.dsa-complexity-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.dsa-complexity-item {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--dsa-radius);
    text-align: center;
}

.dsa-complexity-label {
    font-size: 0.8rem;
    color: var(--dsa-text-muted);
    margin-bottom: 0.25rem;
}

.dsa-complexity-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dsa-primary);
}

.dsa-complexity-table {
    overflow-x: auto;
}

.dsa-complexity-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.dsa-complexity-table th,
.dsa-complexity-table td {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--dsa-border);
}

.dsa-complexity-table th {
    font-weight: 600;
    color: var(--dsa-text-muted);
}

.dsa-complexity-table td:last-child {
    color: var(--dsa-primary);
    font-weight: 600;
}

/* ===== Code Panel ===== */
.dsa-code-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dsa-code-section,
.dsa-explanation-section,
.dsa-dryrun-section {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    padding: 1.25rem;
}

.dsa-code-section h4,
.dsa-explanation-section h4,
.dsa-dryrun-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem 0;
    font-size: 0.95rem;
    color: var(--dsa-text);
}

.dsa-code-section h4 i,
.dsa-explanation-section h4 i,
.dsa-dryrun-section h4 i {
    color: var(--dsa-primary);
}

.dsa-code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.dsa-code-tabs {
    display: flex;
    gap: 0.25rem;
}

.dsa-code-tab {
    padding: 0.4rem 0.75rem;
    border: none;
    background: var(--dsa-surface);
    color: var(--dsa-text-muted);
    border-radius: var(--dsa-radius);
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s ease;
}

.dsa-code-tab:hover {
    color: var(--dsa-text);
}

.dsa-code-tab.active {
    background: var(--dsa-primary);
    color: white;
}

.dsa-code-display {
    position: relative;
    background: var(--dsa-surface);
    border-radius: var(--dsa-radius);
    overflow: hidden;
}

.dsa-code-display pre {
    margin: 0;
    padding: 1rem;
    max-height: 200px;
    overflow: auto;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--dsa-text);
}

.dsa-code-display code {
    display: block;
}

.dsa-code-line {
    display: block;
    padding: 2px 0;
}

.dsa-code-line.active {
    background: rgba(var(--primary-rgb), 0.2);
    border-left: 3px solid var(--dsa-primary);
    padding-left: 0.5rem;
    margin-left: -0.5rem;
}

/* ===== Step Explanation ===== */
.dsa-step-explanation {
    font-size: 0.9rem;
    color: var(--dsa-text);
    line-height: 1.6;
}

.dsa-step-explanation p {
    margin: 0 0 0.5rem 0;
}

.dsa-steps-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.dsa-step-item {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--dsa-surface);
    border-radius: var(--dsa-radius);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.dsa-step-item.active {
    background: rgba(var(--primary-rgb), 0.1);
    border-left: 3px solid var(--dsa-primary);
}

.dsa-step-item.completed {
    opacity: 0.6;
}

.dsa-step-number {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dsa-primary);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.dsa-step-text {
    flex: 1;
    color: var(--dsa-text);
}

/* ===== Dry Run ===== */
.dsa-dryrun-controls {
    margin-bottom: 1rem;
}

.dsa-dryrun-header {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: var(--dsa-radius);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.dsa-dryrun-vars {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.dsa-var-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--dsa-surface);
    border-radius: var(--dsa-radius);
    font-size: 0.85rem;
}

.dsa-var-name {
    color: var(--dsa-text-muted);
}

.dsa-var-value {
    font-weight: 600;
    color: var(--dsa-primary);
    font-family: 'Monaco', monospace;
}

.dsa-dryrun-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.dsa-dryrun-actions .dsa-btn {
    flex: 1;
}

/* ===== Feature Tabs ===== */
.dsa-feature-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.dsa-feature-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--dsa-border);
    background: var(--dsa-surface);
    border-radius: var(--dsa-radius);
    cursor: pointer;
    font-weight: 500;
    white-space: nowrap;
    transition: all 0.2s ease;
    color: var(--dsa-text);
}

.dsa-feature-tab i {
    color: var(--dsa-primary);
}

.dsa-feature-tab:hover {
    border-color: var(--dsa-primary);
}

.dsa-feature-tab.active {
    background: var(--dsa-gradient);
    color: white;
    border-color: transparent;
}

.dsa-feature-tab.active i {
    color: white;
}

/* ===== Feature Panels ===== */
.dsa-feature-panel {
    display: none;
}

.dsa-feature-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

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

/* ===== Comparison Panel ===== */
.dsa-comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dsa-comparison-card {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.dsa-comparison-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.dsa-comparison-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.dsa-comparison-header i {
    font-size: 1.5rem;
    color: var(--dsa-primary);
}

.dsa-comparison-header h5 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--dsa-text);
}

.dsa-comparison-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dsa-comparison-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--dsa-border);
    font-size: 0.9rem;
    color: var(--dsa-text);
}

.dsa-comparison-list li:last-child {
    border-bottom: none;
}

.dsa-comparison-list strong {
    color: var(--dsa-primary);
}

.dsa-comparison-table-wrapper {
    overflow-x: auto;
}

.dsa-comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius);
    overflow: hidden;
}

.dsa-comparison-table th,
.dsa-comparison-table td {
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--dsa-border);
    font-size: 0.9rem;
}

.dsa-comparison-table th {
    background: rgba(var(--primary-rgb), 0.1);
    font-weight: 600;
    color: var(--dsa-text);
}

.dsa-comparison-table td {
    color: var(--dsa-text);
}

.text-success {
    color: var(--dsa-success) !important;
}

.text-danger {
    color: var(--dsa-danger) !important;
}

/* ===== Quiz Panel ===== */
.dsa-quiz-container {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    padding: 1.5rem;
}

.dsa-quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.dsa-quiz-header h4 {
    margin: 0;
    color: var(--dsa-text);
}

.dsa-quiz-score {
    font-weight: 600;
    color: var(--dsa-primary);
}

.dsa-quiz-content {
    margin-bottom: 1.5rem;
}

.dsa-quiz-question {
    padding: 1.5rem;
    background: var(--dsa-surface);
    border-radius: var(--dsa-radius);
    margin-bottom: 1rem;
}

.dsa-quiz-question p {
    margin: 0;
    font-size: 1rem;
    color: var(--dsa-text);
}

.dsa-quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.dsa-quiz-option {
    padding: 1rem 1.25rem;
    background: var(--dsa-surface);
    border: 2px solid var(--dsa-border);
    border-radius: var(--dsa-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    color: var(--dsa-text);
}

.dsa-quiz-option:hover {
    border-color: var(--dsa-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.dsa-quiz-option.correct {
    border-color: var(--dsa-success);
    background: rgba(39, 174, 96, 0.1);
    color: var(--dsa-success);
}

.dsa-quiz-option.wrong {
    border-color: var(--dsa-danger);
    background: rgba(231, 76, 60, 0.1);
    color: var(--dsa-danger);
}

.dsa-quiz-option.disabled {
    pointer-events: none;
}

.dsa-quiz-feedback {
    padding: 1rem;
    border-radius: var(--dsa-radius);
    margin-top: 1rem;
    font-size: 0.9rem;
    display: none;
}

.dsa-quiz-feedback.success {
    display: block;
    background: rgba(39, 174, 96, 0.1);
    color: var(--dsa-success);
    border: 1px solid var(--dsa-success);
}

.dsa-quiz-feedback.error {
    display: block;
    background: rgba(231, 76, 60, 0.1);
    color: var(--dsa-danger);
    border: 1px solid var(--dsa-danger);
}

.dsa-quiz-actions {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.dsa-quiz-categories {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.dsa-quiz-categories label {
    font-size: 0.9rem;
    color: var(--dsa-text-muted);
}

.dsa-select {
    padding: 0.5rem 1rem;
    border: 2px solid var(--dsa-border);
    border-radius: var(--dsa-radius);
    background: var(--dsa-surface);
    color: var(--dsa-text);
    font-size: 0.9rem;
    cursor: pointer;
}

.dsa-select:focus {
    outline: none;
    border-color: var(--dsa-primary);
}

/* ===== Applications Panel ===== */
.dsa-applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.dsa-application-card {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    border: 1px solid var(--dsa-border);
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.dsa-application-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.dsa-application-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dsa-gradient);
    border-radius: 12px;
    font-size: 1.25rem;
    color: white;
    margin-bottom: 1rem;
}

.dsa-application-card h5 {
    margin: 0 0 1rem 0;
    font-size: 1.1rem;
    color: var(--dsa-text);
}

.dsa-application-card ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem 0;
}

.dsa-application-card li {
    padding: 0.4rem 0;
    font-size: 0.9rem;
    color: var(--dsa-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dsa-application-card li i {
    color: var(--dsa-success);
    font-size: 0.75rem;
}

/* ===== Modal ===== */
.dsa-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.dsa-modal.show {
    display: flex;
}

.dsa-modal-content {
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius-lg);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow: hidden;
    animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

.dsa-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-bottom: 1px solid var(--dsa-border);
}

.dsa-modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--dsa-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dsa-modal-header h3 i {
    color: var(--dsa-primary);
}

.dsa-modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--dsa-text);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.dsa-modal-close:hover {
    background: var(--dsa-danger);
    color: white;
}

.dsa-modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(80vh - 70px);
}

.dsa-help-section {
    margin-bottom: 1.5rem;
}

.dsa-help-section:last-child {
    margin-bottom: 0;
}

.dsa-help-section h4 {
    margin: 0 0 0.75rem 0;
    color: var(--dsa-text);
    font-size: 1rem;
}

.dsa-help-section ol,
.dsa-help-section ul {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--dsa-text);
}

.dsa-help-section li {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.dsa-shortcut-list {
    list-style: none;
    padding: 0;
}

.dsa-shortcut-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dsa-shortcut-list kbd {
    padding: 0.25rem 0.5rem;
    background: var(--dsa-surface);
    border: 1px solid var(--dsa-border);
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: monospace;
}

/* ===== Toast ===== */
.dsa-toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.dsa-toast {
    padding: 0.75rem 1.25rem;
    background: var(--dsa-bg);
    border-radius: var(--dsa-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: toastSlide 0.3s ease;
    font-size: 0.9rem;
    color: var(--dsa-text);
}

.dsa-toast.success {
    border-left: 4px solid var(--dsa-success);
}

.dsa-toast.error {
    border-left: 4px solid var(--dsa-danger);
}

.dsa-toast.info {
    border-left: 4px solid var(--dsa-info);
}

.dsa-toast.warning {
    border-left: 4px solid var(--dsa-warning);
}

.dsa-toast.success i {
    color: var(--dsa-success);
}

.dsa-toast.error i {
    color: var(--dsa-danger);
}

.dsa-toast.info i {
    color: var(--dsa-info);
}

.dsa-toast.warning i {
    color: var(--dsa-warning);
}

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

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

/* ===== Responsive Styles ===== */
@media (max-width: 1200px) {
    .dsa-main-content {
        grid-template-columns: 260px 1fr;
    }

    .dsa-code-panel {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 992px) {
    .dsa-main-content {
        grid-template-columns: 1fr;
    }

    .dsa-controls-panel {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .dsa-control-section:first-child {
        grid-column: 1 / -1;
    }

    .dsa-code-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .dsa-visualizer-container {
        padding: 1rem;
    }

    .dsa-header {
        padding: 1rem;
    }

    .dsa-header-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .dsa-header h2 {
        font-size: 1.25rem;
    }

    .dsa-structure-tabs {
        flex-direction: column;
    }

    .dsa-structure-tab {
        flex-direction: row;
        justify-content: center;
        padding: 0.75rem 1rem;
    }

    .dsa-controls-panel {
        grid-template-columns: 1fr;
    }

    .dsa-operations-group {
        gap: 0.4rem;
    }

    .dsa-btn-operation {
        flex: 1 1 100%;
    }

    .dsa-canvas-container {
        min-height: 300px;
    }

    .dsa-visualization {
        padding: 1rem;
        min-height: 250px;
    }

    .dsa-stack-elements {
        width: 100px;
    }

    .dsa-queue-elements {
        flex-direction: row;
        overflow-x: auto;
        justify-content: flex-start;
        padding: 1rem;
    }

    .dsa-queue-element {
        flex-shrink: 0;
        padding: 0.75rem 1rem;
        font-size: 1rem;
    }

    .dsa-linkedlist-elements {
        flex-direction: row;
        overflow-x: auto;
        padding: 1rem;
    }

    .dsa-linkedlist-node {
        flex-shrink: 0;
    }

    .dsa-node-data {
        padding: 0.75rem 1rem;
        font-size: 1rem;
    }

    .dsa-comparison-grid {
        grid-template-columns: 1fr;
    }

    .dsa-applications-grid {
        grid-template-columns: 1fr;
    }

    .dsa-quiz-actions {
        flex-direction: column;
    }

    .dsa-feature-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .dsa-toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }

    .dsa-toast {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .dsa-header-content {
        flex-direction: column;
        text-align: center;
    }

    .dsa-header-actions {
        width: 100%;
        justify-content: center;
    }

    .dsa-input-row {
        flex-direction: column;
    }

    .dsa-input-row .dsa-input-sm {
        width: 100%;
    }

    .dsa-speed-buttons {
        flex-direction: column;
    }

    .dsa-complexity-grid {
        grid-template-columns: 1fr;
    }

    .dsa-code-tabs {
        flex-wrap: wrap;
    }

    .dsa-comparison-table {
        font-size: 0.75rem;
    }

    .dsa-comparison-table th,
    .dsa-comparison-table td {
        padding: 0.5rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    .dsa-visualizer-container {
        max-width: 100%;
        padding: 0;
    }

    .dsa-header-actions,
    .dsa-controls-panel,
    .dsa-feature-tabs,
    .dsa-feature-panels,
    .dsa-toast-container {
        display: none !important;
    }

    .dsa-visualization-panel {
        width: 100%;
    }
}