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

html, body {
    width: 100%;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    background: white;
    color: #222;
    overflow: hidden;
}

.main-screen {
    display: flex;
    width: 100%;
    height: 100vh;
}

/* LEFT PANEL */
.left-panel {
    width: 280px;
    padding: 16px;
    border-right: 1px solid #d8d8d8;
    overflow: hidden;
    background: white;
}

.left-panel h1 {
    font-size: 22px;
    margin-bottom: 14px;
    font-weight: 600;
}

.section {
    margin-bottom: 12px;
}

.section label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 5px;
    color: #666;
}

.section input {
    width: 100%;
    padding: 7px 8px;
    border: 1px solid #ccc;
    border-radius: 3px;
    font-size: 14px;
    font-family: inherit;
}

.section input:focus {
    outline: none;
    border-color: #333;
}

/* COLOR GRID */
.color-grid {
    display: grid;
    grid-template-columns: repeat(7, 18px);
    gap: 5px;
}

.color-btn {
    width: 18px;
    height: 18px;
    border: 2px solid transparent;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.15s;
}

.color-btn:hover {
    border-color: #333;
}

.color-btn.active {
    border-color: #333;
    box-shadow: 0 0 0 1px #333;
}

/* BUTTONS */
.button-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}

.btn {
    padding: 7px 10px;
    background: white;
    border: 1px solid #ccc;
    color: #333;
    font-size: 13px;
    font-weight: 500;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.btn:hover {
    border-color: #333;
    background: #f5f5f5;
}

.btn.active {
    background: #333;
    color: white;
    border-color: #333;
}

.play-btn {
    width: 100%;
    padding: 9px;
    background: #333;
    color: white;
    border-color: #333;
    font-weight: 600;
    font-size: 14px;
}

.play-btn:hover {
    background: #444;
}

.back-btn {
    width: 100%;
    padding: 8px;
    font-size: 13px;
    margin-top: 4px;
}

.status {
    margin-top: 8px;
    padding: 8px;
    background: white;
    border: 1px solid #eee;
    border-radius: 3px;
    font-size: 12px;
    text-align: center;
    color: #666;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.choices {
    display: grid;
    gap: 6px;
    margin-top: 4px;
}

.choice-row {
    display: grid;
    grid-template-columns: 14px 1fr auto auto;
    gap: 8px;
    align-items: center;
    padding: 7px 8px;
    border: 1px solid #e7e7e7;
    border-radius: 3px;
    font-size: 12px;
    color: #333;
}

.color-dot {
    width: 12px;
    height: 12px;
    border: 1px solid #333;
    border-radius: 50%;
}

/* RIGHT PANEL */
.right-panel {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    position: relative;
}

#gameCanvas {
    width: min(72vw, 72vh);
    height: min(72vw, 72vh);
    max-width: calc(100vw - 320px);
    max-height: calc(100vh - 32px);
    border: 1px solid #ddd;
    background: white;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.game-over-content {
    text-align: center;
}

.game-over-content h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

.game-over-content p {
    font-size: 14px;
    color: #666;
    margin-bottom: 16px;
}

.game-over-content .btn {
    padding: 10px 20px;
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .left-panel {
        width: 250px;
    }
    
    .left-panel h1 {
        font-size: 20px;
    }
}

@media (max-width: 768px) {
    .main-screen {
        flex-direction: column;
    }
    
    .left-panel {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #ddd;
        max-height: 46%;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 10px;
        padding: 15px;
        overflow: auto;
    }
    
    .right-panel {
        flex: 1;
        max-height: 54%;
    }

    #gameCanvas {
        width: min(90vw, 48vh);
        height: min(90vw, 48vh);
        max-width: 90vw;
        max-height: 48vh;
    }
}