/* Bento Arcade Design - Snake Game CSS */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --grid-color: rgba(15, 23, 42, 0.025);
    
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(15, 23, 42, 0.08);
    --card-border-hover: rgba(15, 23, 42, 0.15);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --arcade-accent: #2563eb;
    --arcade-accent-rgb: 37, 99, 235;
    
    --font-sans: 'Outfit', 'Noto Sans SC', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    
    --screen-border: rgba(15, 23, 42, 0.15);
    --dpad-btn-bg: rgba(15, 23, 42, 0.04);
    --dpad-btn-border: rgba(15, 23, 42, 0.08);
    --dpad-btn-hover: rgba(15, 23, 42, 0.08);
    --glow-strength: rgba(37, 99, 235, 0.15);
}

[data-theme="dark"] {
    --bg-primary: #07090e;
    --bg-secondary: #0b0d14;
    --grid-color: rgba(255, 255, 255, 0.015);
    
    --card-bg: rgba(13, 19, 33, 0.45);
    --card-border: rgba(255, 255, 255, 0.05);
    --card-border-hover: rgba(255, 255, 255, 0.15);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --arcade-accent: #10b981;
    --arcade-accent-rgb: 16, 185, 129;
    
    --screen-border: rgba(255, 255, 255, 0.05);
    --dpad-btn-bg: rgba(255, 255, 255, 0.02);
    --dpad-btn-border: rgba(255, 255, 255, 0.05);
    --dpad-btn-hover: rgba(255, 255, 255, 0.08);
    --glow-strength: rgba(16, 185, 129, 0.25);
}

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

body {
    width: 100%;
    min-height: 100vh;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Technical Grid background */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

/* Layout container */
.game-container {
    width: 100%;
    max-width: 480px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.back-btn {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 0.4rem 0.85rem;
    border-radius: 99px;
    transition: var(--transition-smooth);
}

.back-btn:hover {
    color: var(--text-primary);
    border-color: var(--card-border-hover);
    transform: translateX(-2px);
}

.brand-title {
    font-size: 0.9rem;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: var(--text-muted);
}

.control-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    outline: none;
}

.control-btn:hover {
    color: var(--text-primary);
    border-color: var(--card-border-hover);
}

.theme-icon-moon,
.theme-icon-sun {
    width: 18px;
    height: 18px;
}

[data-theme="dark"] .theme-icon-moon { display: none; }
[data-theme="dark"] .theme-icon-sun { display: block !important; }
:root:not([data-theme="dark"]) .theme-icon-moon { display: block; }
:root:not([data-theme="dark"]) .theme-icon-sun { display: none !important; }

/* Main Arcade Board */
.arcade-card {
    border-radius: 28px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.75rem;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: var(--transition-smooth);
}

[data-theme="dark"] .arcade-card {
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
}

/* Scoreboard */
.scoreboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.score-box {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--card-border);
    padding: 0.6rem;
    border-radius: 12px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

[data-theme="dark"] .score-box {
    background: rgba(0, 0, 0, 0.2);
}

.score-label {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.score-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--arcade-accent);
    text-shadow: 0 0 8px var(--glow-strength);
    transition: color 0.4s ease;
}

/* Screen Wrapper */
.screen-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
    background-color: #07090e;
    border-radius: 18px;
    border: 3px solid var(--screen-border);
    overflow: hidden;
    box-shadow: inset 0 8px 24px rgba(0, 0, 0, 0.4);
}

#game-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Overlay screens */
.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(7, 9, 14, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    backdrop-filter: blur(4px);
    transition: opacity 0.3s ease;
}

.overlay-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
}

.game-title-logo {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, #60a5fa 0%, #10b981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: title-pulse 2s infinite ease-in-out;
}

@keyframes title-pulse {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 2px rgba(16,185,129,0)); }
    50% { transform: scale(1.05); filter: drop-shadow(0 0 10px rgba(16,185,129,0.3)); }
}

.overlay-hint {
    font-size: 0.8rem;
    color: #8b949e;
    max-width: 240px;
    line-height: 1.5;
}

.action-btn {
    background: var(--arcade-accent);
    color: white;
    border: none;
    padding: 0.65rem 2rem;
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 14px var(--glow-strength);
    transition: var(--transition-smooth);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--glow-strength);
    opacity: 0.95;
}

.action-btn:active {
    transform: translateY(0);
}

/* Mobile Dpad controls */
.virtual-dpad {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    margin: 0.5rem 0;
}

/* Hide D-pad on desktop */
@media (min-width: 768px) {
    .virtual-dpad {
        display: none;
    }
}

.dpad-btn {
    width: 54px;
    height: 54px;
    border-radius: 12px;
    background: var(--dpad-btn-bg);
    border: 1px solid var(--dpad-btn-border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    outline: none;
    touch-action: manipulation;
}

.dpad-btn:active {
    background: var(--arcade-accent);
    color: white;
    border-color: var(--arcade-accent);
    transform: scale(0.92);
}

.dpad-middle {
    display: flex;
    align-items: center;
    gap: 2.2rem; /* creates space for center hub */
    position: relative;
}

.dpad-center-hub {
    width: 36px;
    height: 36px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

/* Help tip Footer */
.game-footer {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    text-align: center;
}

.control-tip {
    font-size: 0.72rem;
    color: var(--text-muted);
}