/* Modern Chinese Chess Styling */

:root {
    /* Colors */
    --bg-dark: #0f0f1e;
    --bg-gradient-start: #1a1a2e;
    --bg-gradient-end: #16213e;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    
    --primary-red: #dc2626;
    --primary-red-light: #ef4444;
    --primary-gold: #fbbf24;
    --primary-gold-light: #fcd34d;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b7280;
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(251, 191, 36, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    z-index: -1;
}

.background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(220, 38, 38, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(251, 191, 36, 0.1) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease-out;
}

.title {
    font-family: 'Noto Serif SC', serif;
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-red-light) 0%, var(--primary-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    text-shadow: var(--shadow-glow);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.title-chinese {
    font-size: 4rem;
    letter-spacing: 0.5rem;
}

.title-vietnamese {
    font-size: 2rem;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
}

/* Game Container */
.game-container {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-xl);
    animation: fadeIn 0.8s ease-out;
}

/* Board Panel */
.board-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.player-indicator {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.player-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    opacity: 0.5;
}

.player-badge.active {
    opacity: 1;
    border-color: var(--primary-gold);
    box-shadow: 0 0 20px rgba(251, 191, 36, 0.4);
    transform: scale(1.05);
}

.player-badge.red.active {
    border-color: var(--primary-red-light);
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

.player-icon {
    font-size: 1.5rem;
}

.player-name {
    font-weight: 600;
    font-size: 1.1rem;
}

/* Canvas Wrapper */
.canvas-wrapper {
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: center;
    align-items: center;
}

#gameCanvas {
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

/* Game Status */
.game-status {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.status-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--primary-gold);
}

/* Control Panel */
.control-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.card {
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Difficulty Selector */
.difficulty-selector {
    margin-bottom: var(--spacing-md);
}

.difficulty-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.select-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.select-input:hover {
    border-color: var(--primary-gold);
}

.select-input:focus {
    outline: none;
    border-color: var(--primary-gold);
    box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.2);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05rem;
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-red-light) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 2px solid var(--card-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-gold);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.2rem;
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Move History */
.move-history {
    max-height: 200px;
    overflow-y: auto;
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
}

.move-history::-webkit-scrollbar {
    width: 6px;
}

.move-history::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

.move-history::-webkit-scrollbar-thumb {
    background: var(--primary-gold);
    border-radius: 3px;
}

.empty-history {
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-md);
    font-style: italic;
}

.move-item {
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

/* Info Card */
.info-card {
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.1) 0%, rgba(251, 191, 36, 0.1) 100%);
}

.info-list {
    list-style: none;
    color: var(--text-secondary);
}

.info-list li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.info-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-gold);
    font-weight: bold;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: var(--spacing-lg);
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 1.2rem;
    color: var(--primary-gold);
    font-weight: 600;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    border: 2px solid var(--primary-gold);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    text-align: center;
    box-shadow: var(--shadow-glow), var(--shadow-lg);
    animation: scaleIn 0.3s ease-out;
}

.modal-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-red-light) 0%, var(--primary-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-message {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .game-container {
        grid-template-columns: 1fr;
    }
    
    .control-panel {
        grid-template-columns: repeat(2, 1fr);
        display: grid;
    }
}

@media (max-width: 768px) {
    .title-chinese {
        font-size: 3rem;
    }
    
    .title-vietnamese {
        font-size: 1.5rem;
    }
    
    .control-panel {
        grid-template-columns: 1fr;
    }
    
    .player-indicator {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}