@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700;800&display=swap');

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

:root {
    --bg-dark:        #020e0d;
    --bg-card:        #091c1b;
    --border-color:   #174440;
    --accent-color:   #2dd4bf;
    --accent-dark:    #14b8a6;
    --glow:           rgba(45, 212, 191, 0.3);
    --text-primary:   #dff7f5;
    --text-secondary: #4d9994;
    --snake-head:     #2dd4bf;
    --snake-body:     #14b8a6;
    --food-color:     #fb923c;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(ellipse 70% 55% at 10% 0%,   rgba(45, 212, 191, 0.07) 0%, transparent 100%),
        radial-gradient(ellipse 60% 50% at 90% 100%, rgba(20, 184, 166, 0.05) 0%, transparent 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 1.5rem;
    gap: 1.5rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.back-link:hover { color: var(--accent-color); }

.game-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.stats-container {
    display: flex;
    gap: 2rem;
}

.stat-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.5rem;
    border-radius: 1rem;
    text-align: center;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

canvas {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: 0 0 50px rgba(0,0,0,0.5), 0 0 20px var(--glow);
    max-width: 100%;
    max-height: 100%;
}

.controls-hint {
    position: absolute;
    bottom: 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    background: rgba(0,0,0,0.4);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    backdrop-filter: blur(4px);
}

.game-over-overlay {
    position: absolute;
    inset: 0;
    background: rgba(2, 14, 13, 0.85);
    backdrop-filter: blur(8px);
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    z-index: 10;
    border-radius: 1rem;
}

.game-over-overlay.active { display: flex; }

.game-over-title {
    font-size: 3rem;
    font-weight: 800;
    color: #ef4444;
    text-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

.btn-restart {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
    border: none;
    color: #020e0d;
    padding: 1rem 2.5rem;
    border-radius: 0.75rem;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 0 20px var(--glow);
}

.btn-restart:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px var(--glow);
}