/* ============================================
   AlgoViz — Visualizer Page Styles (Full-Width Edition)
   ============================================ */

/* === Page Layout === */
.viz-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-primary);
}

/* === Refined Header with Subtitle === */
.viz-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 12px 28px;
    border-bottom: 1.5px solid var(--border-color);
    background: var(--soft-cream);
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(37, 37, 37, 0.03);
}

.back-btn {
    font-size: 13px;
    padding: 7px 14px;
    font-weight: 600;
}

.viz-header-title-group {
    display: flex;
    flex-direction: column;
    gap: 1px;
    flex: 1;
}

.viz-title {
    font-size: 19px;
    font-weight: 700;
    color: var(--royal-blue);
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.viz-subtitle {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.viz-header-controls select {
    min-width: 190px;
    font-weight: 600;
    background-color: #FFFFFF;
}

/* === Controls Toolbar — Grouped Clusters === */
.viz-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    padding: 10px 28px;
    border-bottom: 1.5px solid var(--border-color);
    background: var(--warm-ivory);
}

.controls-cluster {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--soft-cream);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 5px 12px;
    box-shadow: var(--shadow-xs);
}

.cluster-label {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    user-select: none;
    margin-right: 2px;
}

.control-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.control-item label {
    white-space: nowrap;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.control-item input[type="range"] {
    width: 95px;
}

.control-item input[type="text"] {
    width: 150px;
    background: #FFFFFF;
}

.control-item input[type="number"] {
    width: 80px;
    background: #FFFFFF;
}

.toggle-group {
    display: flex;
    gap: 0;
}

.toggle-group .btn {
    border-radius: 0;
    padding: 5px 12px;
    font-size: 12px;
}

.toggle-group .btn:first-child {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.toggle-group .btn:last-child {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-left: -1px;
}

.playback-cluster {
    margin-left: auto;
    gap: 6px;
    padding: 5px 8px;
}

/* === Full-Width Page Content Container === */
.viz-content-container {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    padding: 20px 28px 48px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* === Canvas Wrapper: 80% Viz Area + 20% Live Code Trace === */
.viz-canvas-wrapper {
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    border: 1.5px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: grid;
    grid-template-columns: 80% 20%;
    background: #FFFFFF;
    transition: grid-template-columns 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.viz-canvas-wrapper.code-collapsed {
    grid-template-columns: 1fr 44px;
}

/* === Interactive Visualization Canvas (80% Space) === */
.viz-area {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 8px;
    padding: 64px 32px 36px;
    min-height: 460px;
    position: relative;
    overflow: hidden;
    background-color: #FFFFFF;
    background-image: radial-gradient(#D8D5C9 1.3px, transparent 1.3px);
    background-size: 20px 20px;
    box-sizing: border-box;
    width: 100%;
}

/* === Live Code (Trace) Panel (20% Space) === */
.viz-code-panel {
    display: flex;
    flex-direction: column;
    background: #FAF9F5;
    border-left: 1.5px solid var(--border-color);
    box-sizing: border-box;
    overflow: hidden;
    min-height: 460px;
    position: relative;
    user-select: text;
}

.viz-code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 12px 14px;
    background: #FFFFFF;
    border-bottom: 1.5px solid var(--border-color);
    flex-shrink: 0;
}

.viz-code-header-left {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}

.viz-code-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 9.5px;
    font-weight: 800;
    letter-spacing: 0.8px;
    color: var(--vibrant-pink);
    text-transform: uppercase;
}

.viz-code-badge .code-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--vibrant-pink);
    box-shadow: 0 0 6px rgba(217, 61, 129, 0.5);
    animation: codePulse 1.8s ease-in-out infinite;
}

@keyframes codePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.35);
        opacity: 0.6;
    }
}

.viz-code-title {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 700;
    color: var(--royal-blue);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.viz-code-header-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.viz-code-step-badge {
    font-size: 10.5px;
    font-weight: 700;
    color: var(--royal-blue);
    background: rgba(34, 77, 149, 0.08);
    border: 1px solid rgba(34, 77, 149, 0.16);
    padding: 2px 7px;
    border-radius: 6px;
    white-space: nowrap;
}

.viz-code-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 26px;
    height: 26px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.viz-code-toggle:hover {
    background: var(--soft-cream);
    color: var(--royal-blue);
    border-color: var(--royal-blue);
}

.viz-code-body {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    padding: 10px 8px;
    background: #FAF9F5;
}

/* Custom Thin Scrollbar for Code Panel */
.viz-code-body::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}

.viz-code-body::-webkit-scrollbar-track {
    background: #FAF9F5;
}

.viz-code-body::-webkit-scrollbar-thumb {
    background: #D8D5C9;
    border-radius: 4px;
}

.viz-code-body::-webkit-scrollbar-thumb:hover {
    background: #BBB7AA;
}

.viz-code-lines {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace);
}

.viz-code-line {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 4px 6px;
    border-radius: 5px;
    font-size: 11px;
    line-height: 1.45;
    color: #4A4A4A;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
    border-left: 2.5px solid transparent;
    white-space: pre-wrap;
    word-break: break-word;
}

.viz-code-line:hover {
    background: rgba(0, 0, 0, 0.035);
}

.viz-code-line .line-num {
    width: 18px;
    text-align: right;
    color: #A09D94;
    font-size: 10px;
    font-weight: 600;
    flex-shrink: 0;
    user-select: none;
    padding-top: 1px;
}

.viz-code-line code {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

.viz-code-line.active {
    background: #FFF0F6;
    border-left-color: var(--vibrant-pink);
    color: #8A1E4B;
    font-weight: 700;
    box-shadow: 0 1px 4px rgba(217, 61, 129, 0.1);
    position: relative;
}

.viz-code-line.active::after {
    content: '▶';
    position: absolute;
    right: 8px;
    top: 5px;
    font-size: 8px;
    color: var(--vibrant-pink);
    opacity: 0.85;
}

.viz-code-line.active .line-num {
    color: var(--vibrant-pink);
    font-weight: 800;
}

.viz-code-line.active code {
    font-weight: 800;
    color: #8A1E4B;
}

.viz-code-footer {
    padding: 8px 12px;
    background: #FFFFFF;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    font-size: 10.5px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.viz-code-tag {
    font-family: var(--font-mono, monospace);
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #8A857A;
    background: var(--soft-cream);
    padding: 2px 6px;
    border-radius: 4px;
}

.viz-code-status {
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Collapsed State for Code Panel */
.viz-canvas-wrapper.code-collapsed .viz-code-body,
.viz-canvas-wrapper.code-collapsed .viz-code-footer,
.viz-canvas-wrapper.code-collapsed .viz-code-title,
.viz-canvas-wrapper.code-collapsed .viz-code-step-badge {
    display: none;
}

.viz-canvas-wrapper.code-collapsed .viz-code-panel {
    background: #FFFFFF;
    cursor: pointer;
}

.viz-canvas-wrapper.code-collapsed .viz-code-header {
    flex-direction: column;
    padding: 14px 6px;
    height: 100%;
    border-bottom: none;
    justify-content: flex-start;
    gap: 16px;
}

.viz-canvas-wrapper.code-collapsed .viz-code-badge {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    letter-spacing: 2px;
    font-size: 10px;
    padding: 8px 0;
}

.viz-canvas-wrapper.code-collapsed .toggle-icon {
    transform: rotate(180deg);
}

.viz-placeholder {
    color: var(--text-muted);
    font-size: 14.5px;
    font-weight: 500;
    align-self: center;
    background: rgba(236, 235, 219, 0.6);
    border: 1.5px dashed var(--border-color);
    padding: 16px 28px;
    border-radius: var(--radius-md);
}

/* === Color Legend === */
.color-legend {
    position: absolute;
    top: 14px;
    left: 24px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    z-index: 10;
    background: rgba(255, 255, 255, 0.94);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xs);
    backdrop-filter: blur(4px);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 3px;
    display: inline-block;
    box-shadow: 0 1px 2px rgba(37, 37, 37, 0.15);
}

/* === Vertical Bars (Sorting Playground) === */
.bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    background: var(--royal-blue);
    border-radius: 5px 5px 0 0;
    min-width: 6px;
    max-width: 54px;
    transition: width 0.18s cubic-bezier(0.2, 0.8, 0.2, 1), height 0.14s ease, background-color 0.14s ease, box-shadow 0.14s ease, transform 0.14s ease;
    position: relative;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(34, 77, 149, 0.18);
    transform-origin: bottom center;
}

/* === Natural Gravity Fall & Elastic Impact Ground Physics === */
@keyframes gravity-fall {
    0% {
        transform: translateY(-140px) scaleY(1.08) scaleX(0.94);
        opacity: 0;
    }

    16% {
        opacity: 1;
    }

    44% {
        /* Ground impact */
        transform: translateY(0) scaleY(1.0) scaleX(1.0);
    }

    50% {
        /* Elastic ground compression (squash against floor) */
        transform: translateY(0) scaleY(0.82) scaleX(1.12);
    }

    58% {
        /* Restitution decompression pushing off ground */
        transform: translateY(-10px) scaleY(1.06) scaleX(0.95);
    }

    70% {
        /* Primary rebound apex under gravity */
        transform: translateY(-22px) scaleY(1.02) scaleX(0.98);
    }

    82% {
        /* Secondary touchdown with minor compression */
        transform: translateY(0) scaleY(0.94) scaleX(1.03);
    }

    91% {
        /* Micro-bounce apex */
        transform: translateY(-5px) scaleY(1.0) scaleX(1.0);
    }

    100% {
        /* Fully settled baseline */
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.bar.drop-in {
    animation: gravity-fall 0.48s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
    transform-origin: bottom center;
}

/* === Reverse Gravity Launch & Catapult Ground Physics (Decreasing Size) === */
@keyframes gravity-launch {
    0% {
        /* Baseline resting */
        transform: translateY(0) scale(1);
        opacity: 1;
    }
    9% {
        /* Pre-launch micro-hop */
        transform: translateY(-5px) scaleY(1.0) scaleX(1.0);
    }
    18% {
        /* Pre-launch touchdown */
        transform: translateY(0) scaleY(0.94) scaleX(1.03);
    }
    30% {
        /* Rebound apex */
        transform: translateY(-22px) scaleY(1.02) scaleX(0.98);
    }
    42% {
        /* Pre-load descent pushing down */
        transform: translateY(-10px) scaleY(1.06) scaleX(0.95);
    }
    50% {
        /* Maximum ground compression squash (loading kinetic spring) */
        transform: translateY(0) scaleY(0.82) scaleX(1.12);
    }
    56% {
        /* Elastic spring decompression leaving ground */
        transform: translateY(0) scaleY(1.0) scaleX(1.0);
    }
    84% {
        /* High-speed upward rocket ascent */
        opacity: 1;
    }
    100% {
        /* Launched high into sky and vanished */
        transform: translateY(-140px) scaleY(1.08) scaleX(0.94);
        opacity: 0;
    }
}

.bar-launching {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    background: var(--royal-blue);
    border-radius: 5px 5px 0 0;
    min-width: 6px;
    max-width: 54px;
    position: absolute;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(34, 77, 149, 0.18);
    transform-origin: bottom center;
    pointer-events: none;
    z-index: 5;
    animation: gravity-launch 0.48s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.bar-label {
    position: absolute;
    top: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11.5px;
    color: var(--text-primary);
    font-weight: 700;
    white-space: nowrap;
    pointer-events: none;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.bar-index,
.bar-index-launching {
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted);
    font-family: var(--font-mono);
    white-space: nowrap;
    line-height: 1;
    pointer-events: none;
}

/* State Classes for Bars */
.bar.comparing {
    background: var(--color-comparing);
    box-shadow: 0 0 14px rgba(212, 172, 13, 0.5);
    transform: scaleY(1.02);
    transform-origin: bottom;
}

.bar.swapping {
    background: var(--vibrant-pink);
    box-shadow: 0 0 16px rgba(217, 61, 129, 0.55);
    transform: scaleY(1.04);
    transform-origin: bottom;
}

.bar.sorted {
    background: var(--color-sorted);
    box-shadow: 0 2px 6px rgba(39, 174, 96, 0.25);
}

.bar.pivot {
    background: var(--color-pivot);
    box-shadow: 0 0 14px rgba(142, 68, 173, 0.45);
}

/* === Array Cells (Searching Playground) === */
.search-cells-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    gap: 16px;
    padding: 24px;
    padding: 24px 16px 36px;
}

.search-target-display {
    font-size: 14.5px;
    color: var(--text-secondary);
    padding: 6px 18px;
    border-radius: 20px;
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    box-shadow: var(--shadow-xs);
    font-weight: 500;
}

.search-target-display strong {
    color: var(--royal-blue);
    font-weight: 700;
    font-family: var(--font-mono);
}

.search-cells {
    display: flex;
    gap: 10px;
    row-gap: 38px;
    column-gap: 12px;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 1200px;
    position: relative;
}

.cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--soft-cream);
    transition: all 0.16s ease;
    position: relative;
    font-size: 16px;
    font-weight: 700;
    color: var(--royal-blue);
    box-shadow: 0 2px 5px rgba(37, 37, 37, 0.05);
    transform-origin: bottom center;
}

.cell.drop-in {
    animation: gravity-fall 0.48s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
    transform-origin: bottom center;
}

.cell-launching {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--soft-cream);
    position: absolute;
    font-size: 16px;
    font-weight: 700;
    color: var(--royal-blue);
    box-shadow: 0 2px 5px rgba(37, 37, 37, 0.05);
    transform-origin: bottom center;
    pointer-events: none;
    z-index: 5;
    animation: gravity-launch 0.48s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.cell-index,
.cell-index-launching {
    position: absolute;
    bottom: -21px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10.5px;
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
    line-height: 1;
    pointer-events: none;
}

.cell-pointer {
    position: absolute;
    top: -24px;
    font-size: 10px;
    font-weight: 800;
    padding: 1px 5px;
    border-radius: 3px;
    white-space: nowrap;
    box-shadow: 0 1px 3px rgba(37, 37, 37, 0.12);
}

.cell.current {
    border-color: var(--vibrant-pink);
    background: rgba(217, 61, 129, 0.15);
    color: var(--vibrant-pink);
    box-shadow: 0 0 14px rgba(217, 61, 129, 0.35);
    transform: scale(1.06);
}

.cell.checked {
    border-color: var(--border-color);
    background: #E2DFD2;
    color: var(--text-secondary);
}

.cell.found {
    border-color: var(--color-found);
    background: rgba(39, 174, 96, 0.18);
    color: #1E8449;
    box-shadow: 0 0 16px rgba(39, 174, 96, 0.4);
    transform: scale(1.08);
}

.cell.not-found {
    border-color: var(--vibrant-pink);
    background: rgba(217, 61, 129, 0.1);
    color: var(--vibrant-pink);
}

.cell.active {
    border-color: var(--royal-blue);
    background: rgba(34, 77, 149, 0.08);
}

.cell.eliminated {
    border-color: var(--border-light);
    background: var(--warm-ivory);
    color: var(--text-muted);
    opacity: 0.5;
}

.cell.low-ptr {
    border-bottom: 3.5px solid #1E8449;
}

.cell.mid-ptr {
    border-bottom: 3.5px solid var(--royal-blue);
}

.cell.high-ptr {
    border-bottom: 3.5px solid var(--vibrant-pink);
}

.pointer-label {
    font-size: 10px;
    font-weight: 800;
}

.pointer-label.low {
    color: #1E8449;
    background: #E8F8F0;
}

.pointer-label.mid {
    color: var(--royal-blue);
    background: #EDF3FC;
}

.pointer-label.high {
    color: var(--vibrant-pink);
    background: #FDF0F5;
}

/* === 4. Progress Section Row === */
.progress-section {
    width: 100%;
}

.progress-card {
    background: var(--soft-cream);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    box-shadow: var(--shadow-xs);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.progress-label-group {
    display: flex;
    align-items: baseline;
    gap: 14px;
}

.progress-title {
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    color: var(--royal-blue);
}

.step-count {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.step-count strong {
    color: var(--royal-blue);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.step-pct {
    font-size: 13px;
    font-weight: 700;
    color: var(--royal-blue);
}

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

.progress-fill {
    height: 100%;
    background: var(--royal-blue);
    border-radius: 4px;
    transition: width 0.15s ease;
    width: 0%;
}

/* === 5 & 6. Side-by-Side Interactive Row === */
.interactive-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 20px;
    width: 100%;
}

.interactive-col {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.interactive-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--royal-blue);
    padding: 0 2px;
}

/* Explanation Card */
.explanation-card {
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    box-shadow: var(--shadow-xs);
    min-height: 94px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.explanation-card .op-text {
    font-size: 13.5px;
    color: var(--text-primary);
    line-height: 1.6;
}

.explanation-card .op-result {
    margin-top: 8px;
    padding-top: 6px;
    border-top: 1px dashed var(--border-color);
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    height: 100%;
}

.counter-card {
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    box-shadow: var(--shadow-xs);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    transition: transform var(--transition-fast);
}

.counter-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.counter-label {
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    font-weight: 700;
    color: var(--text-secondary);
}

.counter-icon {
    font-size: 13px;
    color: var(--text-muted);
}

.counter-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--royal-blue);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}

/* === 7 & 8. Full-Width Algorithm Complexity & Learning Section Below === */
.complexity-section-full {
    width: 100%;
    margin-top: 8px;
}

.complexity-container {
    background: var(--soft-cream);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 32px;
    box-shadow: var(--shadow-xs);
}

.complexity-section-label {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--royal-blue);
    margin-bottom: 4px;
}

.complexity-algo-name {
    font-size: 24px;
    font-weight: 800;
    color: var(--royal-blue);
    letter-spacing: -0.3px;
    margin-bottom: 8px;
}

.complexity-algo-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 900px;
    margin-bottom: 24px;
}

/* 4 Complexity Cards Grid */
.complexity-cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 22px;
}

.complexity-stat-card {
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    box-shadow: var(--shadow-xs);
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: transform var(--transition-fast);
}

.complexity-stat-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.stat-card-label {
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
}

.stat-card-value {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 800;
    color: var(--royal-blue);
}

/* Learning Details Row (Properties & When to Use) */
.complexity-details-row {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 16px;
}

.properties-card {
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    box-shadow: var(--shadow-xs);
}

.when-to-use-card {
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: var(--shadow-xs);
}

.card-section-title {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--royal-blue);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}

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

.property-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12.5px;
    color: var(--text-secondary);
}

.property-name {
    font-weight: 600;
}

.complexity-tag {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: var(--radius-xs);
    border: 1.5px solid var(--border-color);
    background: #FFFFFF;
}

.complexity-tag.yes {
    border-color: #27AE60;
    color: #1E8449;
    background: #F4FBF7;
}

.complexity-tag.no {
    border-color: var(--vibrant-pink);
    color: var(--vibrant-pink);
    background: #FFF9FA;
}

.when-to-use-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* === Visualizer Semantic Footer === */
.viz-footer {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    padding: 24px 28px 48px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

.viz-footer p {
    margin: 0;
}

.viz-footer a {
    color: var(--royal-blue);
    font-weight: 600;
    text-decoration: none;
    margin-left: 8px;
    transition: color 0.15s ease;
}

.viz-footer a:hover {
    color: var(--vibrant-pink);
    text-decoration: underline;
}

/* === Responsive Layout === */
@media (max-width: 1040px) {
    .complexity-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .interactive-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 860px) {
    .viz-canvas-wrapper {
        grid-template-columns: 1fr;
    }

    .viz-canvas-wrapper.code-collapsed {
        grid-template-columns: 1fr;
    }

    .viz-canvas-wrapper.code-collapsed .viz-code-panel {
        display: none;
    }

    .viz-code-panel {
        border-left: none;
        border-top: 1.5px solid var(--border-color);
        min-height: 240px;
        max-height: 320px;
    }

    .viz-code-body {
        max-height: 220px;
    }

    .viz-content-container {
        padding: 16px 16px 36px;
    }

    .viz-controls {
        padding: 8px 16px;
    }

    .controls-cluster {
        width: 100%;
        justify-content: flex-start;
    }

    .playback-cluster {
        justify-content: center;
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .viz-header {
        flex-wrap: wrap;
        padding: 10px 16px;
        gap: 10px;
    }

    .viz-header-controls {
        width: 100%;
    }

    .viz-header-controls select {
        width: 100%;
    }

    .viz-area {
        min-height: 320px;
        padding: 50px 14px 28px;
        padding: 50px 14px 38px;
    }

    .complexity-container {
        padding: 20px 18px;
    }

    .complexity-algo-name {
        font-size: 20px;
    }

    .control-item input[type="text"] {
        width: 120px;
    }
}

@media (max-width: 540px) {
    .viz-area {
        padding: 50px 10px 38px;
        gap: 5px;
    }

    .search-cells-wrapper {
        padding: 18px 8px 36px;
        gap: 14px;
    }

    .search-cells {
        row-gap: 40px;
        column-gap: 8px;
    }

    .cell {
        width: 42px;
        height: 42px;
        font-size: 13px;
    }

    .cell-index {
        bottom: -20px;
        font-size: 10px;
    }

    .bar-index {
        bottom: -21px;
        font-size: 9px;
    }

    .bar-label {
        top: -20px;
        font-size: 10px;
    }

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

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

    .btn {
        padding: 6px 10px;
        font-size: 12px;
    }
}

@media (max-width: 360px) {
    .viz-area {
        padding: 48px 8px 36px;
        gap: 4px;
    }

    .search-cells {
        row-gap: 38px;
        column-gap: 6px;
    }

    .cell {
        width: 38px;
        height: 38px;
        font-size: 12px;
    }

    .cell-launching {
        width: 38px;
        height: 38px;
        font-size: 12px;
    }

    .cell-index,
    .cell-index-launching {
        bottom: -19px;
        font-size: 9.5px;
    }

    .bar-index,
    .bar-index-launching {
        bottom: -20px;
        font-size: 8.5px;
    }

    .bar-label {
        top: -19px;
        font-size: 9px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .bar.drop-in,
    .cell.drop-in,
    .bar-launching,
    .cell-launching {
        animation: none !important;
        transform: none !important;
        opacity: 1 !important;
    }
}