:root {
    --bg: #fafafa;
    --accents-1: #ffffff;
    --accents-2: #eaeaea;
    --accents-3: #999999;
    --accents-5: #666666;
    --fg: #000000;
    --success: #0070f3;
    --error: #ee0000;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

.container {
    display: flex;
    flex-direction: column;
    gap: 32px;
    width: 100%;
    max-width: 800px;
    align-items: center;
}

.title {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.06em;
    background: linear-gradient(180deg, #000 0%, #444 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.board-container {
    position: relative;
    padding-top: 48px;
    width: 100%;
    display: flex;
    justify-content: center;
}

canvas {
    cursor: crosshair;
    display: block;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
    max-width: 100%;
    height: auto;
    border: 1px solid var(--accents-2);
}

#status {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    font-weight: 700;
    font-size: 1rem;
    color: var(--accents-5);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    white-space: nowrap;
    background: var(--accents-1);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--accents-2);
    z-index: 10;
}

.analysis-container {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 16px;
    flex-wrap: wrap;
}

.stat-box, .chart-container, .game-controls {
    background-color: var(--accents-1);
    padding: 12px 20px;
    border-radius: 16px;
    border: 1px solid var(--accents-2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 70px;
    box-sizing: border-box;
    margin: 0;
}

.stat-box {
    flex: 0 0 auto;
    min-width: 150px;
    align-items: center;
}

.stat-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chart-container {
    flex: 2;
    min-width: 300px;
    padding: 12px;
    position: relative;
    overflow: hidden;
    box-shadow: none;
}

#win-prob-chart {
    width: 100%;
    height: 100%;
    display: block;
    box-shadow: none;
    border: none;
}

.chart-title {
    position: absolute;
    top: 8px;
    left: 12px;
    font-size: 0.75rem;
    color: var(--accents-5);
    font-weight: 600;
    pointer-events: none;
    letter-spacing: 0.05em;
}

.game-controls {
    flex: 0 0 auto;
}

.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
}

.toggle-label {
    font-size: 0.9rem;
    color: var(--accents-5);
    text-transform: uppercase;
    font-weight: 600;
}

.switch-container {
    display: flex;
    background-color: var(--bg);
    padding: 4px;
    border-radius: 10px;
    border: 1px solid var(--accents-2);
    position: relative;
    isolation: isolate;
}

.switch-container.analysis-switches {
    gap: 8px;
    background-color: transparent;
    border: none;
    padding: 0;
}

.switch-container.analysis-switches button {
    border: 1px solid var(--accents-2);
    border-radius: 10px;
    background-color: #e0e0e0;
    color: var(--fg);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
}

.switch-container.analysis-switches button::after {
    content: "✕";
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--accents-3);
}

.switch-container.analysis-switches button:not(.active):hover {
    border-color: var(--accents-3);
}

.switch-container.analysis-switches button.active {
    background-color: var(--fg);
    color: var(--accents-1);
    border-color: var(--fg);
}

.switch-container.analysis-switches button.active::after {
    content: "✓";
    color: var(--accents-1);
}

.analysis-bar {
    width: 100%;
    background-color: var(--accents-1);
    padding: 12px 20px;
    border-radius: 16px;
    border: 1px solid var(--accents-2);
    box-sizing: border-box;
}

.toggle-group.horizontal {
    flex-direction: row;
    justify-content: center;
    gap: 16px;
}

.switch-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    width: calc(50% - 4px);
    background-color: var(--fg);
    border-radius: 6px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

.switch-container button {
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    background: transparent;
    color: var(--fg);
    cursor: pointer;
    transition: color 0.3s ease;
    flex: 1;
    white-space: nowrap;
}

.switch-container button.active {
    background-color: transparent;
    color: var(--bg);
}

.switch-container:not(.analysis-switches) button:not(.active):hover {
    background-color: transparent;
    color: var(--fg);
    opacity: 0.7;
}

.label { 
    font-size: 0.9rem; 
    letter-spacing: 0.05em;
    color: var(--accents-5); 
    margin-bottom: 4px;
}

.value { 
    font-size: 2rem; 
    font-weight: 800; 
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.action-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    width: 100%;
}

.action-buttons button {
    flex: 1;
    max-width: 150px;
    height: 44px;
    font-weight: 600;
}

button {
    background-color: transparent;
    border: 1px solid var(--accents-2);
    color: var(--fg);
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover { 
    background-color: var(--accents-1);
    border-color: var(--accents-3);
}

button.active { 
    background-color: var(--fg);
    color: var(--bg);
    border-color: var(--fg);
}

#undo-btn {
    background-color: transparent;
}

#reset-btn { 
    background-color: var(--fg);
    color: var(--bg);
    border-color: var(--fg);
    text-align: center;
}

#reset-btn:hover { 
    background-color: var(--accents-5);
    border-color: var(--accents-5);
}

#loading-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loader {
    width: 40px;
    height: 40px;
    border: 2px solid var(--accents-2);
    border-top: 2px solid var(--fg);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 800px) {
    .container {
        padding: 12px;
    }
    .analysis-container {
        gap: 8px;
    }
    .stat-box, .chart-container, .game-controls {
        min-width: 140px;
        flex: 1 1 auto;
    }
}