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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}


.container {
    max-width: 1800px;
    margin: 0 auto;
}

.sidebar-header {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.sidebar-header h1 {
    text-align: center;
    color: #667eea;
    margin-bottom: 15px;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.sidebar-header .stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-label {
    font-weight: 600;
    color: #555;
}

.stat-value {
    font-size: 1.4em;
    font-weight: bold;
    color: #667eea;
    min-width: 40px;
    text-align: center;
}

.game-content {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.game-board-wrapper {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: auto;
    max-height: calc(100vh - 40px);
}

.board-with-axes {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
}

.axis-row {
    display: grid;
    grid-template-columns: repeat(18, 36px);
    gap: 2px;
    font-size: 12px;
    color: #4a5568;
}

.axis-main {
    display: flex;
    align-items: center;
    gap: 6px;
}

.axis-col {
    display: grid;
    grid-template-rows: repeat(18, 36px);
    gap: 2px;
    font-size: 12px;
    color: #4a5568;
}

.axis-label {
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-board-wrapper.turn-a {
    background: #dff7e8;
}

.game-board-wrapper.turn-b {
    background: #ddeeff;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(18, 36px);
    gap: 2px;
    justify-content: center;
    user-select: none;
}

.cell {
    width: 36px;
    height: 36px;
    border: 2px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    background: #f8f9fa;
    border-radius: 4px;
}

.cell.empty {
    background: #e9ecef;
    color: #adb5bd;
    border-color: #e9ecef;
    cursor: default;
}

.cell.empty:hover {
    transform: none;
    box-shadow: none;
}

.cell:hover {
    transform: scale(1.1);
    z-index: 10;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.cell.current {
    background: #48bb78;
    color: white;
    border-color: #38a169;
    animation: pulse 1s infinite;
}

.cell.player-a {
    box-shadow: 0 0 0 2px rgba(72, 187, 120, 0.35) inset;
}

.cell.player-b {
    box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.35) inset;
}

.cell.path {
    background: #ffd93d;
    border-color: #f6c000;
}

.cell.selectable {
    border-color: #667eea;
    background: #e6f0ff;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.sidebar {
    width: 350px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.controls, .info-panel, .path-display, .available-moves {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.controls h3, .info-panel h3, .path-display h3, .available-moves h3 {
    margin-bottom: 15px;
    color: #667eea;
    font-size: 1.1em;
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 10px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #48bb78;
    color: white;
}

.btn-secondary:hover {
    background: #38a169;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(72, 187, 120, 0.3);
}

.btn-warning {
    background: #ed8936;
    color: white;
}

.btn-warning:hover {
    background: #dd6b20;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(237, 137, 54, 0.3);
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95em;
    color: #555;
    margin-top: 10px;
}

.toggle-item input {
    width: 18px;
    height: 18px;
}

.btn-success {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 10px;
    background: #38b2ac;
    color: white;
}

.btn-success:hover {
    background: #2c7a7b;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(56, 178, 172, 0.3);
}

.start-points-panel {
    margin-top: 20px;
    margin-bottom: 20px;
}

.start-points-panel h4 {
    margin-bottom: 10px;
    color: #555;
    font-size: 0.95em;
}

.start-points-group {
    margin-bottom: 12px;
}

.start-points-title {
    font-size: 0.85em;
    font-weight: 700;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.start-points-title.player-a {
    color: #2f855a;
}

.start-points-title.player-b {
    color: #2b6cb0;
}

.start-points-list {
    max-height: 150px;
    overflow-y: auto;
    font-size: 0.9em;
}

.start-point-item {
    padding: 8px 10px;
    background: #f7fafc;
    margin-bottom: 5px;
    border-radius: 4px;
    border-left: 4px solid #667eea;
}

.start-point-item.player-a {
    border-left-color: #48bb78;
}

.start-point-item.player-b {
    border-left-color: #4299e1;
}

.undo-redo-controls {
    margin-top: 20px;
}

.undo-redo-controls h4 {
    margin-bottom: 10px;
    color: #555;
    font-size: 0.95em;
}

.undo-redo-buttons {
    display: flex;
    gap: 10px;
}

.btn-undo, .btn-redo {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    background: #ed8936;
    color: white;
}

.btn-undo:hover:not(:disabled), .btn-redo:hover:not(:disabled) {
    background: #dd6b20;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(237, 137, 54, 0.3);
}

.btn-undo:disabled, .btn-redo:disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    opacity: 0.5;
}

.btn-undo:active:not(:disabled), .btn-redo:active:not(:disabled) {
    transform: translateY(0);
}

.direction-controls {
    margin-top: 20px;
}

.direction-controls h4 {
    margin-bottom: 10px;
    color: #555;
    font-size: 0.95em;
}

.arrow-keys {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.arrow-row {
    display: flex;
    gap: 5px;
}

.arrow-btn {
    width: 70px;
    height: 60px;
    background: #f7fafc;
    border: 2px solid #cbd5e0;
    border-radius: 8px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.arrow-btn small {
    font-size: 10px;
    color: #718096;
    margin-top: 2px;
}

.arrow-btn:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
    transform: scale(1.05);
}

.arrow-btn:active {
    transform: scale(0.95);
}

.arrow-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.rules {
    color: #555;
    font-size: 0.9em;
    line-height: 1.6;
}

.rules ul {
    margin-left: 20px;
    margin-top: 8px;
}

.rules li {
    margin-bottom: 5px;
}

.path-list, .moves-list {
    max-height: 150px;
    overflow-y: auto;
    font-size: 0.9em;
}

.path-item {
    padding: 5px 10px;
    background: #f7fafc;
    margin-bottom: 5px;
    border-radius: 4px;
    border-left: 3px solid #667eea;
}

.move-item {
    padding: 8px 10px;
    background: #f7fafc;
    margin-bottom: 5px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 3px solid #48bb78;
}

.empty-message {
    color: #999;
    font-style: italic;
    text-align: center;
    padding: 10px;
}

/* 滚动条美化 */
.path-list::-webkit-scrollbar, .moves-list::-webkit-scrollbar, .game-board-wrapper::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.path-list::-webkit-scrollbar-track, .moves-list::-webkit-scrollbar-track, .game-board-wrapper::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.path-list::-webkit-scrollbar-thumb, .moves-list::-webkit-scrollbar-thumb, .game-board-wrapper::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 4px;
}

.path-list::-webkit-scrollbar-thumb:hover, .moves-list::-webkit-scrollbar-thumb:hover, .game-board-wrapper::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .game-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .game-board {
        grid-template-columns: repeat(25, 35px);
    }

    .cell {
        width: 35px;
        height: 35px;
        font-size: 12px;
    }
}

@media (max-width: 768px) {
    .game-board {
        grid-template-columns: repeat(25, 28px);
    }

    .cell {
        width: 28px;
        height: 28px;
        font-size: 10px;
    }

    .stats {
        gap: 15px;
    }

    .stat-value {
        font-size: 1.2em;
    }
}