: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;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

.container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: 1400px;
    align-items: stretch;
}

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

.layout {
    display: grid;
    grid-template-columns: minmax(200px, 240px) minmax(0, 1fr) minmax(220px, 300px);
    grid-template-rows: auto 1fr;
    gap: 20px;
    align-items: start;
}

.header-area {
    grid-column: 1;
    grid-row: 1;
}

.left-panel {
    grid-column: 1;
    grid-row: 2;
}


.board-panel {
    grid-column: 2;
    grid-row: 2;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    margin-top: -80px;
}

.right-panel {
    grid-column: 3;
    grid-row: 2;
}

.panel-stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.board-container {
    position: relative;
    padding-top: 0;
    width: 100%;
    display: flex;
    justify-content: center;
}

.board-warning {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(18, 18, 18, 0.45);
    backdrop-filter: blur(2px);
    z-index: 20;
    padding: 20px;
    box-sizing: border-box;
}

.board-warning.is-visible {
    display: flex;
}

.board-warning-card {
    max-width: 520px;
    width: min(92%, 520px);
    background: #ffffff;
    color: var(--fg);
    border-radius: 14px;
    padding: 22px 24px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.2);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.board-warning-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.board-warning-text {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--accents-5);
}

.board-warning-close {
    align-self: center;
    min-width: 140px;
    background: var(--fg);
    color: var(--bg);
    border-color: var(--fg);
}

.board-warning-close:hover {
    background: var(--accents-5);
    border-color: var(--accents-5);
}

canvas {
    cursor: crosshair;
    display: block;
    border-radius: 0;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.1);
    max-width: 100%;
    height: auto;
    border: 1px solid var(--accents-2);
}

#status {
    align-self: stretch;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--accents-5);
    background: var(--accents-1);
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--accents-2);
    min-height: 96px;
    box-sizing: border-box;
    gap: 8px;
}

.status-main {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.status-text {
    text-transform: uppercase;
    letter-spacing: 0.15em;
    text-align: center;
    white-space: nowrap;
}

.status-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accents-5);
    letter-spacing: 0.04em;
}

.status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.status-row-progress {
    align-items: center;
}

.status-progress {
    flex: 1;
    height: 6px;
    background: var(--accents-2);
    border-radius: 999px;
    overflow: hidden;
    position: relative;
}

.status-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #111 0%, #555 100%);
    transition: width 0.2s ease;
}

.status-label {
    font-weight: 600;
}

.status-value {
    font-variant-numeric: tabular-nums;
    color: var(--fg);
}

.status-foot {
    font-size: 0.75rem;
    color: var(--accents-5);
    letter-spacing: 0.04em;
    text-align: center;
    min-height: 1em;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.stat-box, .chart-container, .game-controls, .sim-controls, .analysis-bar {
    background-color: var(--accents-1);
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--accents-2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 96px;
    box-sizing: border-box;
    margin: 0;
}

.sim-controls {
    background-color: var(--accents-1);
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--accents-2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 96px;
    box-sizing: border-box;
    gap: 8px;
}

.analysis-bar {
    flex: 0 0 auto;
    min-width: 240px;
    min-height: 96px;
}

.sim-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}

.sim-controls .value {
    font-size: 1.4rem;
    font-weight: 700;
}

.sim-controls input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 999px;
    background: linear-gradient(90deg, #111 0%, #555 100%);
    outline: none;
    margin: 4px 0;
}

.sim-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--fg);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

.sim-controls input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--fg);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

.sim-range {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--accents-5);
    letter-spacing: 0.04em;
}

.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: 6px;
    position: relative;
    overflow: hidden;
    box-shadow: none;
    min-height: 220px;
}

#win-prob-chart {
    width: 100%;
    height: 100%;
    display: block;
    box-shadow: none;
    border: none;
    border-radius: 0;
    margin-top: 16px;
}

.chart-title {
    position: absolute;
    top: 8px;
    left: 12px;
    font-size: 0.9rem;
    color: var(--accents-5);
    font-weight: 600;
    pointer-events: none;
    letter-spacing: 0.05em;
}

.game-controls {
    flex: 0 0 auto;
    align-items: center;
}

.sim-controls {
    flex: 0 0 auto;
    min-width: 200px;
}

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

 .analysis-bar {
      background-color: var(--accents-1);
     padding: 10px 12px;
      border-radius: 8px;
      border: 1px solid var(--accents-2);
      box-sizing: border-box;
      min-height: 120px;
      display: flex;
      flex-direction: column;
     gap: 6px;
  }

.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;
}

.analysis-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    width: 100%;
    flex-wrap: wrap;
    padding: 4px 6px;
    border-radius: 8px;
    border: none;
    background-color: var(--accents-1);
    box-shadow: none;
    box-sizing: border-box;
    align-self: stretch;
}

.analysis-option-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--fg);
    letter-spacing: 0.02em;
    flex: 1 1 auto;
    min-width: 0;
}

.analysis-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    width: 46px;
    height: 24px;
    cursor: pointer;
    flex: 0 0 auto;
}

.analysis-switch input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.analysis-switch-track {
    position: absolute;
    inset: 0;
    border-radius: 999px;
    background-color: var(--accents-2);
    border: 1px solid var(--accents-3);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.analysis-switch-thumb {
    position: absolute;
    top: 50%;
    left: 3px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--bg);
    border: 1px solid var(--accents-3);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.18);
    transform: translateY(-50%);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.analysis-switch input:checked ~ .analysis-switch-track {
    background-color: var(--fg);
    border-color: var(--fg);
}

.analysis-switch input:checked ~ .analysis-switch-thumb {
    transform: translate(22px, -50%);
    border-color: var(--fg);
}

.analysis-switch input:focus-visible ~ .analysis-switch-track {
    box-shadow: 0 0 0 2px rgba(0, 112, 243, 0.25);
}

.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: 2px;
}

.stat-box .label {
    font-weight: 600;
}

.value { 
    font-size: 1.8rem; 
    font-weight: 800; 
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

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

.board-actions {
    width: fit-content;
    align-self: center;
}

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

.board-actions button {
    flex: 0 0 auto;
    width: 120px;
}

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;
}

.loading-text {
    font-size: 1rem;
    letter-spacing: 0.05em;
    color: var(--accents-5);
    margin-bottom: 10px;
}

.loading-progress {
    width: min(280px, 70vw);
    height: 8px;
    background: var(--accents-2);
    border-radius: 999px;
    overflow: hidden;
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.05);
}

.loading-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #111 0%, #555 100%);
    transition: width 0.2s ease;
}

.loading-progress-value {
    margin-top: 8px;
    font-size: 0.9rem;
    letter-spacing: 0.06em;
    color: var(--accents-5);
    font-variant-numeric: tabular-nums;
}

.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: 1024px) {
    body {
        padding: 8px;
    }
    .container {
        padding: 6px;
    }
    .layout {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }
    .header-area,
    .left-panel,
    .board-actions,
    .board-panel,
    .right-panel {
        grid-column: auto;
        grid-row: auto;
        width: 100%;
    }
    .header-area {
        order: 1;
    }
    .board-actions {
        order: 2;
    }
    .board-panel {
        order: 3;
    }
    .left-panel {
        order: 4;
    }
    .right-panel {
        order: 5;
    }
    .panel-stack {
        gap: 12px;
    }
    .chart-container {
        min-height: 200px;
    }
}

.game-controls .toggle-group {
    flex-direction: row;
    align-items: center;
    gap: 8px;
    flex-wrap: nowrap;
    justify-content: center;
}

.game-controls .toggle-label {
    font-size: 0.9rem;
    margin-right: 8px;
    white-space: nowrap;
    flex-shrink: 0;
}

.sim-controls .label {
    font-size: 0.9rem;
    color: var(--accents-5);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.game-controls .switch-container {
    padding: 4px;
    border-radius: 6px;
    min-width: 0;
}

.game-controls .switch-slider {
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    width: calc(50% - 4px);
    border-radius: 4px;
}

.game-controls .switch-container button {
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 1rem;
}

.game-controls {
    padding: 0 16px;
}
.stat-box {
    padding: 0 16px;
}
.chart-container {
    padding: 0 10px;
}
.stat-content {
    flex-direction: row;
    gap: 8px;
    align-items: baseline;
}
.label {
    margin-bottom: 0;
}