/* Tile Rack */
.tile-rack {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: linear-gradient(to right, #2193b0, #6dd5ed);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    min-height: 80px;
    align-items: center;
    justify-content: center;
    position: relative;
}

.tile-rack.exchange-mode {
    background: linear-gradient(to right, #ee9ca7, #ffdde1);
}

.tile-rack.empty::before {
    content: "Drag tiles here";
    position: absolute;
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-md);
    font-weight: 500;
    pointer-events: none;
}

.tile-rack .tile {
    margin: 0 2px;
}

.tile-rack.exchange-mode .tile {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tile-rack.exchange-mode .tile:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tile-rack.exchange-mode .tile.selected {
    transform: scale(0.9);
    border: 2px solid white;
}

/* Tile animations for rack interactions */
.tile-enter {
    animation: tileEnter var(--transition-normal) forwards;
}

.tile-exit {
    animation: tileExit var(--transition-normal) forwards;
}

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

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

/* Tile Styles */
.tile {
    position: relative;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #f6d365 0%, #fda085 100%);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: move;
    user-select: none;
    transition: all var(--transition-fast);
}

.tile:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tile.dragging {
    opacity: 0.6;
    transform: scale(1.1);
}

.tile.placed {
    animation: placeTile var(--transition-normal) forwards;
}

.tile-letter {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 700;
    text-transform: uppercase;
    line-height: 1;
}

.tile-points {
    position: absolute;
    bottom: 2px;
    right: 4px;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    font-weight: 500;
    opacity: 0.8;
}

.tile.blank {
    background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
}

.tile.blank .tile-letter {
    color: var(--text-secondary);
}

.tile.selected {
    border: 2px solid var(--primary-color);
    transform: scale(0.95);
}

.tile.invalid {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

.tile.preview {
    opacity: 0.7;
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

.tile.bonus {
    animation: glow 2s ease-in-out infinite;
}

@keyframes placeTile {
    0% {
        transform: scale(1.2);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.5;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes shake {
    10%, 90% {
        transform: translate3d(-1px, 0, 0);
    }
    20%, 80% {
        transform: translate3d(2px, 0, 0);
    }
    30%, 50%, 70% {
        transform: translate3d(-2px, 0, 0);
    }
    40%, 60% {
        transform: translate3d(2px, 0, 0);
    }
}

@keyframes glow {
    0% {
        box-shadow: 0 0 5px rgba(46, 125, 50, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(46, 125, 50, 0.8);
    }
    100% {
        box-shadow: 0 0 5px rgba(46, 125, 50, 0.5);
    }
}

/* Tile Placeholder */
.tile-placeholder {
    width: 60px;
    height: 60px;
    border: 2px dashed #8b4513;
    border-radius: 5px;
    background-color: rgba(248, 215, 164, 0.3);
}

/* Tile Overlay for Recommendations */
.tile-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(244, 208, 63, 0.6);
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    pointer-events: none;
    z-index: 2;
}

.tile-overlay .tile-letter {
    font-size: 1.2em;
    color: #2c3e50;
}

.tile-overlay .tile-points {
    position: absolute;
    bottom: 2px;
    right: 4px;
    font-size: 0.8em;
    color: #2c3e50;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .tile {
        width: 35px;
        height: 35px;
    }
    
    .tile-letter {
        font-size: var(--font-size-md);
    }
    
    .tile-points {
        font-size: calc(var(--font-size-xs) - 1px);
    }
    
    .tile-rack {
        padding: var(--spacing-sm);
        min-height: 70px;
    }
}

@media (max-width: 480px) {
    .tile {
        width: 30px;
        height: 30px;
    }
    
    .tile-letter {
        font-size: var(--font-size-sm);
    }
    
    .tile-points {
        font-size: calc(var(--font-size-xs) - 2px);
        right: 2px;
        bottom: 1px;
    }
}