:root {
    --primary: #6C5CE7;
    --secondary: #A29BFE;
    --accent: #FF7675;
    --bg-dark: #0F0A1A;
    --text-light: #F1F2F6;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
    max-width: 800px; /* Optional constraint */
    margin: 0 auto;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.screen.hidden {
    opacity: 0;
    pointer-events: none;
    z-index: -1;
}

.title {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 2rem;
    text-shadow: 0 4px 10px rgba(0,0,0,0.5);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(4px);
    box-shadow: var(--shadow);
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(108, 92, 231, 0.4);
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: var(--text-light);
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn.icon {
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* Level Select */
.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 1rem;
    padding: 2rem;
    width: 80% !important;
    max-height: 70vh;
    overflow-y: auto;
    background: var(--glass-bg);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
}

.level-btn {
    aspect-ratio: 1;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-light);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.level-btn:hover {
    background: var(--primary);
    transform: scale(1.1);
}

/* Game HUD */
.game-hud {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 20;
    box-sizing: border-box;
    pointer-events: none; /* Let clicks pass through to canvas */
}

.game-hud button {
    pointer-events: auto;
}

.hud-center {
    font-size: 1.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.canvas-container {
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 1;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
}

.controls-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.5);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    pointer-events: none;
    opacity: 0.8;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    transform: scale(1);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.stats {
    margin: 2rem 0;
    font-size: 1.2rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}