:root {
    --bg-color: #0f0f0f;
    --card-bg: #1a1a1a;
    --text-color: #e0e0e0;
    --accent-color: #4a90e2;
    --border-color: #333;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
}

#game-container {
    display: flex;
    width: 100vw;
    height: 100vh;
}

/* Sidebar */
#sidebar {
    width: 250px;
    background: #151515;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 1px;
    text-transform: uppercase;
}

#inventory {
    flex-grow: 1;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 10px;
}

.inventory-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.inventory-item:hover {
    border-color: var(--accent-color);
    background: #252525;
}

/* Workspace */
#workspace {
    flex-grow: 1;
    position: relative;
    background-image: 
        radial-gradient(#222 1px, transparent 1px);
    background-size: 40px 40px;
    overflow: hidden;
}

#hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #444;
    font-size: 1.5rem;
    font-weight: 200;
    pointer-events: none;
}

/* Draggable Cards */
.card {
    position: absolute;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px 34px;
    border-radius: 10px;
    cursor: move;
    user-select: none;
    -webkit-user-drag: none; /* Disable browser default drag */
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    touch-action: none;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 100px;
    font-size: 1.2rem;
    z-index: 5;
    transition: transform 0.05s linear, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card.is-dragging {
    z-index: 100;
    box-shadow: 0 8px 25px rgba(0,0,0,0.7);
    cursor: grabbing;
}

.card.combining {
    animation: pulse 1s infinite alternate;
    border-color: var(--accent-color);
}

@keyframes pulse {
    from { opacity: 0.6; }
    to { opacity: 1; }
}

/* Trashbin */
#trashbin {
    position: absolute;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    z-index: 20;
}

#trashbin.drag-over {
    background: #8e2e2e;
    transform: scale(1.2);
}