/* Global Styles and Layout */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --light-bg: #ecf0f1;
    --dark-bg: #34495e;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #bdc3c7;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

.chess-app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.app-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.game-status {
    display: flex;
    gap: 2rem;
    font-size: 1rem;
}

.game-status span {
    padding: 0.25rem 0.75rem;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.game-container {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 3fr 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
}

.board-section {
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.captured-pieces {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.captured-pieces h3 {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
}

.captured-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    min-height: 60px;
}

.move-history-section {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex: 1;
}

.move-history {
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.game-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-primary);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Dialogs */
dialog {
    border: none;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    padding: 2rem;
}

dialog::backdrop {
    background-color: rgba(0, 0, 0, 0.5);
}

.promotion-dialog h2,
.game-over-dialog h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

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

.promotion-piece {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.promotion-piece:hover {
    border-color: var(--secondary-color);
    background-color: var(--light-bg);
}

.promotion-piece .piece-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.dialog-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .game-container {
        grid-template-columns: 1fr;
    }

    .captured-white {
        order: 1;
    }

    .board-section {
        order: 2;
    }

    .game-sidebar {
        order: 3;
    }
}