/* ============================================================
   SNAKE GAME — Dark Glassmorphism Theme
   ============================================================ */

:root {
    --bg: #0a0a0f;
    --bg-2: #111118;
    --glass: rgba(255, 255, 255, 0.04);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text: #e8e8ed;
    --text-2: rgba(255, 255, 255, 0.55);
    --text-3: rgba(255, 255, 255, 0.3);
    --accent: #6c63ff;
    --accent-2: #00d4aa;
    --accent-3: #ff6b6b;
    --gradient: linear-gradient(135deg, #6c63ff, #00d4aa);
    --snake-color: #00d4aa;
    --food-color: #ff6b6b;
    --font: 'Inter', sans-serif;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

::selection {
    background: rgba(108, 99, 255, 0.3);
}

.game-container {
    text-align: center;
    max-width: 500px;
    width: 100%;
}

.game-header h1 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 6px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-header h1 i {
    -webkit-text-fill-color: var(--accent-2);
}

.subtitle {
    font-size: 14px;
    color: var(--text-3);
    margin-bottom: 24px;
}

/* Scoreboard */
.scoreboard {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 20px;
}

.score-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 12px 24px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    min-width: 100px;
}

.score-label {
    font-size: 11px;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.score-value {
    font-size: 28px;
    font-weight: 800;
}

.score-value.highlight {
    color: var(--accent-2);
}

/* Canvas */
.canvas-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    background: var(--bg-2);
}

canvas {
    display: block;
}

.overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: opacity 0.3s;
}

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

.overlay-content h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 8px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.overlay-content p {
    font-size: 14px;
    color: var(--text-3);
    margin-bottom: 20px;
}

/* Mobile Controls */
.mobile-controls {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-bottom: 16px;
}

.control-row {
    display: flex;
    gap: 6px;
}

.control-btn {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    color: var(--text);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.control-btn:active {
    background: rgba(108, 99, 255, 0.15);
    border-color: var(--accent);
    transform: scale(0.95);
}

/* Speed Control */
.speed-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.speed-label {
    font-size: 12px;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.speed-slider {
    -webkit-appearance: none;
    width: 120px;
    height: 4px;
    background: var(--glass-border);
    border-radius: 4px;
    outline: none;
}

.speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(108, 99, 255, 0.3);
}

.speed-value {
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
    min-width: 60px;
    text-align: left;
}

/* Buttons */
.actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 12px;
    font-family: var(--font);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    border: none;
}

.btn-start {
    background: var(--gradient);
    color: white;
    padding: 12px 28px;
    font-size: 14px;
}

.btn-start:hover {
    box-shadow: 0 6px 20px rgba(108, 99, 255, 0.3);
    transform: translateY(-1px);
}

.btn-pause {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    color: var(--text-2);
}

.btn-pause:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-pause:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-restart {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    color: var(--text-2);
}

.btn-restart:hover {
    border-color: var(--accent-2);
    color: var(--accent-2);
}

/* Hints */
.hints {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    margin-bottom: 16px;
}

.hints span {
    font-size: 11px;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 4px;
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 5px;
    font-family: var(--font);
    font-size: 10px;
    font-weight: 600;
    color: var(--text-2);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-3);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.3s;
}

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

/* Responsive */
@media (max-width: 440px) {
    canvas {
        width: 300px !important;
        height: 300px !important;
    }
    .game-header h1 { font-size: 26px; }
    .scoreboard { gap: 10px; }
    .score-item { padding: 10px 16px; min-width: 80px; }
    .score-value { font-size: 22px; }
    .mobile-controls { display: flex; }
    .hints { display: none; }
}

@media (min-width: 441px) {
    .mobile-controls { display: none; }
}