:root {
    --bg-app: #F4F7F6;
    --bg-panel: #FFFFFF;
    --text-ink: #2C3E50;
    --text-on-dark: #ECF0F1;
    --text-muted: #7F8C8D;
    --accent-a: #0984E3;
    --accent-b: #8E44AD;
    --accent-active: #D63031;
    --accent-action: #E17055;
    --accent-success: #00B894;
    --accent-pivot: #FDCB6E;
    --border-subtle: #DFE6E9;
    --shadow-card: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-header: 0 4px 20px rgba(45, 52, 54, 0.15);
    --font-serif: 'Georgia', 'Times New Roman', serif;
    --font-sans: 'Helvetica Neue', 'Arial', sans-serif;
    --font-mono: 'Consolas', 'Monaco', monospace;
}

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

body {
    background-color: var(--bg-app);
    color: var(--text-ink);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

.vision-section {
    background: linear-gradient(135deg, #2c3e50 0%, #4a69bd 100%);
    color: var(--text-on-dark);
    padding: 5rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-header);
    position: relative;
    overflow: hidden;
}

.vision-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 50%;
    height: 200%;
    background: rgba(255,255,255,0.03);
    transform: rotate(30deg);
    pointer-events: none;
}

.title {
    font-family: var(--font-serif);
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-on-dark);
    text-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.tagline {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.9rem;
    color: #81ecec;
    margin-bottom: 3rem;
}

.manifesto {
    max-width: 650px;
    margin: 0 auto;
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 300;
    color: #dfe6e9;
    border-left: 4px solid var(--accent-pivot);
    padding-left: 2rem;
    text-align: left;
    background: rgba(0,0,0,0.2);
    padding: 2rem;
    border-radius: 0 8px 8px 0;
    backdrop-filter: blur(5px);
}

.controls-section {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: #fff;
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 800;
    color: var(--text-muted);
}

select, button {
    padding: 0.6rem 1.2rem;
    background: #f1f2f6;
    border: 1px solid transparent;
    color: var(--text-ink);
    font-family: var(--font-sans);
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

select:hover, button:hover {
    background: #dfe4ea;
    transform: translateY(-1px);
}

button#btnPlayPause {
    background-color: var(--text-ink);
    color: #fff;
}
button#btnPlayPause:hover {
    background-color: var(--accent-a);
    box-shadow: 0 4px 10px rgba(9, 132, 227, 0.3);
}

button#btnReset {
    color: var(--accent-active);
    background: rgba(214, 48, 49, 0.1);
}
button#btnReset:hover {
    background: var(--accent-active);
    color: #fff;
}

.stage-section {
    padding: 3rem 2rem;
    display: flex;
    justify-content: center;
}

.canvas-container {
    width: 100%;
    max-width: 1300px;
    aspect-ratio: 16/9;
    background: #fff;
    border-radius: 12px;
    box-shadow: var(--shadow-header);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.insight-banner {
    background-color: var(--accent-action);
    color: #fff;
    padding: 1.2rem;
    text-align: center;
    font-family: var(--font-sans);
    font-weight: 500;
    letter-spacing: 0.5px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.insight-label {
    font-weight: 900;
    color: #fff;
    background: rgba(0,0,0,0.2);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-right: 0.8rem;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.learning-layer {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 2rem;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
}

.learning-layer.compare-mode {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.algo-panel {
    background: var(--bg-panel);
    padding: 0;
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    min-width: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#panelA h2 {
    background: var(--accent-a);
    color: #fff;
}
#panelA .metric-item .val { color: var(--accent-a); }

#panelB h2 {
    background: var(--accent-b);
    color: #fff;
}
#panelB .metric-item .val { color: var(--accent-b); }

.algo-panel h2 {
    font-family: var(--font-sans);
    font-weight: 700;
    margin: 0;
    padding: 1.5rem;
    font-size: 1.4rem;
    letter-spacing: 0.5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-subtle);
}

.narrative-box {
    margin: 0 1.5rem 1.5rem 1.5rem;
    padding: 1rem 1.5rem;
    background: #F8FAFB;
    border-left: 4px solid var(--text-ink);
    font-style: italic;
    color: var(--text-ink);
    border-radius: 0 4px 4px 0;
    min-height: 4rem;
}

.complexity-info {
    margin: 0 1.5rem 1.5rem 1.5rem;
    font-size: 0.9rem;
    overflow-x: auto;
}

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

.complexity-table td {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-muted);
}
.complexity-table td:first-child {
    font-weight: 700;
    color: var(--text-ink);
    padding-right: 1rem;
}

.pseudocode-window {
    background: #2D3436;
    color: #DFE6E9;
    padding: 1.5rem;
    margin: 0 1.5rem 1.5rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    white-space: pre;
    overflow-x: auto;
    border-radius: 8px;
    height: 350px;
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.3);
}

.code-line {
    padding: 3px 0.5rem;
    display: block;
    width: fit-content;
    min-width: 100%;
}

.code-line.active {
    background-color: #636e72;
    color: var(--accent-pivot);
    border-left: 4px solid var(--accent-pivot);
    font-weight: bold;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #bdc3c7;
    border-radius: 4px;
}

@media (max-width: 1000px) {
    .learning-layer.compare-mode {
        grid-template-columns: 1fr;
    }
}