* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    user-select: none;
}

body {
    background-color: #0f172a;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 10px;
}

#game-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    height: 85vh;
    max-height: 600px;
    border: 4px solid #38bdf8;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    background-color: #1e293b;
    cursor: none;
    transition: background-color 0.5s ease;
    touch-action: none;
}

/* Dynamic Level Background Themes */
#game-container.level-1 { background-color: #1e293b; border-color: #38bdf8; }
#game-container.level-2 { background-color: #064e3b; border-color: #34d399; }
#game-container.level-3 { background-color: #701a75; border-color: #f472b6; }
#game-container.level-4 { background-color: #7c2d12; border-color: #fb923c; }
#game-container.level-5 { background-color: #450a0a; border-color: #f87171; }

.ui-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #ffffff;
    font-weight: bold;
    z-index: 5;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
}

.stat-box {
    font-size: 16px;
}

.quick-controls {
    display: flex;
    gap: 6px;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    padding: 2px 6px;
    color: #fff;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.92);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #ffffff;
    z-index: 10;
    padding: 20px;
    text-align: center;
    cursor: default;
    overflow-y: auto;
}

.overlay.hidden {
    display: none;
}

.overlay h1 {
    font-size: 32px;
    color: #f59e0b;
    margin-bottom: 5px;
}

.subtitle {
    color: #94a3b8;
    margin-bottom: 20px;
}

.setup-section {
    margin-bottom: 15px;
    width: 100%;
    max-width: 400px;
}

.setup-section h3 {
    font-size: 14px;
    color: #cbd5e1;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.dog-options, .diff-options {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.dog-btn, .diff-btn {
    padding: 8px 14px;
    font-size: 14px;
    font-weight: 600;
    background-color: #334155;
    color: #f8fafc;
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.dog-btn.active, .diff-btn.active {
    border-color: #38bdf8;
    background-color: #0284c7;
}

.main-btn {
    margin-top: 15px;
    padding: 12px 30px;
    font-size: 18px;
    font-weight: bold;
    background-color: #22c55e;
    color: #ffffff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.4);
    transition: transform 0.2s;
}

.main-btn:hover {
    transform: scale(1.05);
}

.final-score-box {
    font-size: 20px;
    color: #38bdf8;
    margin: 10px 0;
    font-weight: bold;
}

@media (max-width: 600px) {
    .stat-box { font-size: 12px; }
    .overlay h1 { font-size: 24px; }
    .dog-btn, .diff-btn { font-size: 12px; padding: 6px 10px; }
}