:root {
    --bg-color: #050b14;
    --panel-bg: rgba(15, 23, 42, 0.4);
    --panel-border: rgba(34, 211, 238, 0.15);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;

    /* Neon Colors */
    --accent-neon: #22d3ee; /* Cyan */
    --accent-glow: #0891b2;
    --snake-head: #06b6d4; /* Bright cyan */
    --snake-body: #67e8f9; /* Lighter cyan */
    --food-color: #f43f5e; /* Bright rose/red */
    --food-glow: #e11d48;

    --font-main: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

.background-animation {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150vw;
    height: 150vh;
    transform: translate(-50%, -50%);
    background:
        radial-gradient(circle at 30% 30%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 70% 70%, rgba(244, 63, 94, 0.05) 0%, transparent 40%);
    z-index: -1;
    animation: rotateBg 20s linear infinite;
}

@keyframes rotateBg {
    0% {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    100% {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

body::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(34, 211, 238, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(34, 211, 238, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: -1;
    pointer-events: none;
}

.game-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 500px;
    width: 95%;
    z-index: 1;
}

.glow-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.5),
        inset 0 0 15px rgba(34, 211, 238, 0.05);
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}
.game-header h1 {
    font-weight: 800;
    font-size: 2rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--text-primary);
    text-shadow:
        0 0 5px #fff,
        0 0 15px var(--accent-neon),
        0 0 30px var(--accent-glow);
}

.stats {
    display: flex;
    gap: 1.5rem;
}
.score-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    min-width: 80px;
}
.highlight-card {
    border-color: rgba(34, 211, 238, 0.3);
    box-shadow: 0 0 15px rgba(34, 211, 238, 0.1);
}
.score-card .label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 2px;
}
.score-card .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}
.highlight-card .value {
    color: var(--accent-neon);
    text-shadow: 0 0 10px var(--accent-glow);
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.3);
        color: var(--food-color);
        text-shadow: 0 0 20px var(--food-glow);
    }
    100% {
        transform: scale(1);
    }
}
.pulse {
    animation: pulse 0.4s ease-out;
}
@keyframes shake {
    0%,
    100% {
        transform: translateX(0);
    }
    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-4px);
    }
    20%,
    40%,
    60%,
    80% {
        transform: translateX(4px);
    }
}
.shake {
    animation: shake 0.4s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

.game-board-wrapper {
    position: relative;
    padding: 1.25rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(5, 11, 20, 0.8);
    border: 1px solid var(--panel-border);
}

canvas {
    background-color: #020617;
    border-radius: 12px;
    box-shadow:
        0 0 20px rgba(0, 0, 0, 0.8),
        inset 0 0 30px rgba(0, 0, 0, 1);
    border: 1px solid rgba(34, 211, 238, 0.2);
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(2, 6, 23, 0.85);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.25rem;
    opacity: 0;
    pointer-events: none;
    transition:
        opacity 0.4s ease,
        backdrop-filter 0.4s ease;
    z-index: 10;
}
.overlay.active {
    opacity: 1;
    pointer-events: all;
}

.logo-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-top: -20px;
}
.snake-logo-dot {
    width: 20px;
    height: 20px;
    background: var(--accent-neon);
    border-radius: 5px;
    box-shadow: 0 0 20px var(--accent-glow);
    animation: float 2s ease-in-out infinite;
}
@keyframes float {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.overlay h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
    margin-bottom: 0px;
}
#game-over-overlay h2 {
    color: var(--food-color);
    text-shadow: 0 0 20px var(--food-glow);
    font-size: 2.2rem;
}
.overlay p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}
.highlight {
    color: var(--accent-neon);
    font-weight: 700;
    font-size: 1.8rem;
    text-shadow: 0 0 15px var(--accent-glow);
    margin-left: 0.5rem;
}

/* Leaderboard logic */
.leaderboard-preview {
    margin-top: 1rem;
    width: 80%;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 12px;
    padding: 1rem;
}
.leaderboard-preview h3 {
    text-align: center;
    color: var(--accent-neon);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 5px var(--accent-glow);
}
.leaderboard-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.leaderboard-list li {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.leaderboard-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.leaderboard-list .rank {
    color: var(--text-secondary);
    width: 30px;
}
.leaderboard-list .name {
    color: var(--text-primary);
    font-weight: 600;
    flex-grow: 1;
    letter-spacing: 1px;
}
.leaderboard-list .score {
    color: var(--accent-neon);
    font-weight: 700;
}

.score-submit-form {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}
.score-submit-form p {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    text-align: center;
    color: var(--text-primary);
}
.input-group {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}
.input-group input {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--accent-neon);
    color: var(--accent-neon);
    font-family: var(--font-main);
    font-size: 1.2rem;
    padding: 0.5rem;
    width: 80px;
    text-align: center;
    border-radius: 8px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    outline: none;
    box-shadow: inset 0 0 10px rgba(34, 211, 238, 0.1);
}
.input-group input:focus {
    box-shadow:
        0 0 10px rgba(34, 211, 238, 0.4),
        inset 0 0 10px rgba(34, 211, 238, 0.2);
}
.submit-btn {
    background: var(--accent-neon);
    color: var(--bg-color);
    border: none;
    font-size: 1.5rem;
    width: 45px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: transform 0.2s;
}
.submit-btn:hover {
    transform: scale(1.05);
}

/* Buttons */
.primary-btn {
    margin-top: 0.5rem;
    background: transparent;
    color: var(--accent-neon);
    border: 2px solid var(--accent-neon);
    padding: 0.7rem 2rem;
    font-family: var(--font-main);
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow:
        0 0 10px rgba(34, 211, 238, 0.2),
        inset 0 0 10px rgba(34, 211, 238, 0.2);
}
.primary-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300%;
    height: 300%;
    background: var(--accent-neon);
    transform: translate(-50%, -50%) rotate(45deg) translateY(100%);
    transition: transform 0.5s ease;
    z-index: -1;
}
.primary-btn:hover {
    color: var(--bg-color);
    box-shadow:
        0 0 25px rgba(34, 211, 238, 0.6),
        inset 0 0 15px rgba(255, 255, 255, 0.5);
    text-shadow: none;
    transform: translateY(-2px);
}
.primary-btn:hover::before {
    transform: translate(-50%, -50%) rotate(45deg) translateY(0);
}
.primary-btn:active {
    transform: translateY(1px);
}

#game-over-overlay .primary-btn {
    border-color: var(--food-color);
    color: var(--food-color);
    box-shadow:
        0 0 10px rgba(244, 63, 94, 0.2),
        inset 0 0 10px rgba(244, 63, 94, 0.2);
}
#game-over-overlay .primary-btn::before {
    background: var(--food-color);
}
#game-over-overlay .primary-btn:hover {
    color: var(--bg-color);
    box-shadow:
        0 0 25px rgba(244, 63, 94, 0.6),
        inset 0 0 15px rgba(255, 255, 255, 0.5);
}

/* Footer / Controls */
.game-footer {
    padding: 1rem;
    display: flex;
    justify-content: center;
}
.controls-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.key {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    box-shadow:
        0 2px 0 rgba(255, 255, 255, 0.1),
        inset 0 2px 5px rgba(255, 255, 255, 0.05);
    transition:
        transform 0.1s,
        box-shadow 0.1s;
}
.key:active,
.key.active {
    transform: translateY(2px);
    box-shadow:
        0 0 0 rgba(255, 255, 255, 0.1),
        inset 0 2px 5px rgba(0, 0, 0, 0.5);
    background: rgba(34, 211, 238, 0.2);
    border-color: rgba(34, 211, 238, 0.5);
    color: var(--accent-neon);
}
.controls-info p {
    color: var(--text-secondary);
    margin-left: 0.75rem;
    font-size: 0.95rem;
    font-weight: 300;
    letter-spacing: 0.5px;
}