:root {
    --bg-color: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #22d3ee;
    --accent-glow: rgba(34, 211, 238, 0.4);
    --snake-color: #10b981;
    --snake-glow: rgba(16, 185, 129, 0.5);
    --food-color: #ef4444;
    --food-glow: rgba(239, 68, 68, 0.6);
    --grid-color: rgba(255, 255, 255, 0.05);
    --surface: #1e293b;
    --border: rgba(255,255,255,0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(16, 185, 129, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(34, 211, 238, 0.08), transparent 25%);
}

.game-container {
    width: 100%;
    max-width: 500px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin-top: 60px; /* Space for navbar */
}

.game-header {
    width: 100%;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
}

.highlight {
    color: var(--snake-color);
    text-shadow: 0 0 15px var(--snake-glow);
}

.score-board {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    width: 100%;
}

.score-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 120px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.score-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent-glow);
}

.game-area {
    position: relative;
    background: #000;
    border-radius: 12px;
    border: 2px solid var(--border);
    box-shadow: 0 0 30px rgba(0,0,0,0.5), inset 0 0 20px rgba(16, 185, 129, 0.1);
    overflow: hidden;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1/1;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 10;
    transition: opacity 0.3s ease;
}

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

.overlay h2 {
    font-size: 2rem;
    color: var(--text-main);
    text-shadow: 0 0 10px rgba(255,255,255,0.3);
}

.overlay p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.btn {
    background: var(--surface);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.primary-btn {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--snake-color);
    color: var(--snake-color);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.2);
}

.primary-btn:hover {
    background: var(--snake-color);
    color: #000;
    box-shadow: 0 0 20px var(--snake-glow);
}

.mobile-controls {
    display: none;
    width: 100%;
    margin-top: 1rem;
}

.d-pad {
    position: relative;
    width: 180px;
    height: 180px;
    margin: 0 auto;
}

.d-btn {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-muted);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.d-btn:active {
    background: rgba(255,255,255,0.1);
    transform: scale(0.95);
    color: var(--snake-color);
    border-color: var(--snake-color);
}

.up { top: 0; left: 60px; }
.left { top: 60px; left: 0; }
.right { top: 60px; left: 120px; }
.down { top: 120px; left: 60px; }

@media (max-width: 768px) {
    .mobile-controls {
        display: block;
    }
}