:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --correct: #10b981;
    --present: #f59e0b;
    --absent: #475569;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1f3a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

main {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 2rem;
}

.game-section, .visualization-section {
    background: var(--bg-card);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.controls {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: #7c3aed;
    transform: translateY(-2px);
}

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

.btn-accent:hover {
    background: #db2777;
    transform: translateY(-2px);
}

#guessInput {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    background: var(--bg-dark);
    color: var(--text-primary);
    font-size: 1rem;
    text-transform: uppercase;
}

#guessInput:focus {
    outline: none;
    border-color: var(--primary);
}

.game-board {
    display: grid;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.board-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.tile {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    text-transform: uppercase;
    transition: all 0.3s;
}

.tile.correct {
    background: var(--correct);
    border-color: var(--correct);
    animation: flip 0.5s;
}

.tile.present {
    background: var(--present);
    border-color: var(--present);
    animation: flip 0.5s;
}

.tile.absent {
    background: var(--absent);
    border-color: var(--absent);
    animation: flip 0.5s;
}

@keyframes flip {
    0%, 100% { transform: rotateX(0); }
    50% { transform: rotateX(90deg); }
}

.game-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.info-item {
    background: var(--bg-dark);
    padding: 1rem;
    border-radius: 0.5rem;
}

.label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: block;
    margin-bottom: 0.25rem;
}

.info-item span:last-child {
    font-weight: 600;
    font-size: 1.1rem;
}

.visualization-section h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.viz-controls {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.viz-controls label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.network-viz {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.layer-container, .probs-container {
    background: var(--bg-dark);
    padding: 1.5rem;
    border-radius: 0.75rem;
}

.layer-container h3, .probs-container h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

#layersDisplay {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.layer {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 0.5rem;
}

.layer-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.layer-viz {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(8px, 1fr));
    gap: 2px;
    max-height: 100px;
    overflow: hidden;
}

.neuron {
    aspect-ratio: 1;
    border-radius: 2px;
    transition: all 0.2s;
}

.probs-info {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

#probsChart {
    width: 100%;
    height: 300px;
    display: block;
}

@media (max-width: 1024px) {
    main {
        grid-template-columns: 1fr;
    }
}