:root {
    --bg-page: #FFFFFF;
    --bg-game-area: #C8E6C9;
    --bg-canvas: #E8F5E9;
    --text-primary: #1B5E20;
    --text-secondary: #2E7D32;
    --border-color: #4CAF50;
    --btn-primary: #4CAF50;
    --btn-primary-hover: #45A049;
    --btn-secondary: #757575;
    --btn-secondary-hover: #616161;
    --overlay-bg: rgba(0, 0, 0, 0.85);
    --block-border: #1B5E20;
    --info-bg: #F1F8E9;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 20px;
}

/* Compact Top Bar */
.top-compact-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e0e0e0;
}

.simple-back-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.simple-back-link:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.controls-compact {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.9rem;
}

.bottom-title {
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--btn-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(76, 175, 80, 0.3);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--btn-secondary-hover);
    transform: translateY(-2px);
}

/* Game Area */
.game-area {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.player-section {
    background-color: var(--bg-game-area);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.player-header {
    text-align: center;
    margin-bottom: 15px;
}

.player-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.controls-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

/* Left player - info panel on the left */
.player-section:first-child .game-wrapper {
    flex-direction: row-reverse;
}

/* Right player - info panel on the right (default) */
.player-section:last-child .game-wrapper {
    flex-direction: row;
}

canvas {
    background-color: var(--bg-canvas);
    border: 3px solid var(--border-color);
    border-radius: 8px;
    display: block;
}

/* Info Panel */
.info-panel {
    background-color: var(--info-bg);
    padding: 15px;
    border-radius: 8px;
    min-width: 150px;
    border: 2px solid var(--border-color);
}

.info-item {
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-item .label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-item .value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.next-piece {
    margin-top: 20px;
    text-align: center;
}

.next-piece .label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 0.9rem;
}

#next-left,
#next-right {
    background-color: var(--bg-canvas);
    border: 2px solid var(--border-color);
    border-radius: 6px;
}

/* Instructions */
.instructions {
    background-color: var(--bg-game-area);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.instructions h3 {
    text-align: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.instruction-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 20px;
}

.instruction-grid strong {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.instruction-grid ul {
    list-style: none;
    padding-left: 0;
}

.instruction-grid li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

kbd {
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 3px 8px;
    font-family: monospace;
    font-weight: 600;
    color: var(--text-primary);
    display: inline-block;
    min-width: 30px;
    text-align: center;
}

.scoring-info {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    background-color: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    max-width: 500px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.overlay-content h2 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.overlay-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .game-area {
        gap: 20px;
    }

    .game-wrapper {
        flex-direction: column;
        align-items: center;
    }

    .info-panel {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .player-section {
        padding: 15px;
    }

    canvas {
        max-width: 100%;
        height: auto;
    }
}