/* Modern Neon Theme Design System */

:root {
    --bg-dark: #070814;
    --bg-panel: rgba(13, 16, 37, 0.55);
    --bg-panel-border: rgba(255, 255, 255, 0.07);
    --bg-panel-glow: rgba(0, 240, 255, 0.1);
    
    /* Neon Palette */
    --neon-cyan: #00f0ff;
    --neon-yellow: #ffdf00;
    --neon-magenta: #ff007f;
    --neon-green: #39ff14;
    --neon-blue: #0044ff;
    --neon-orange: #ff6c00;
    --neon-purple: #9d00ff;
    --neon-text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);

    /* UI State colors */
    --color-text-primary: #f0f3ff;
    --color-text-secondary: #8a9fc4;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--color-text-primary);
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Background elements */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

.bg-grid {
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: perspective(500px) rotateX(60deg) translateY(-100px);
    animation: grid-scroll 30s linear infinite;
}

.bg-glow {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    z-index: -1;
}

.bg-glow-left {
    background: var(--neon-magenta);
    top: 10%;
    left: -100px;
}

.bg-glow-right {
    background: var(--neon-cyan);
    bottom: 10%;
    right: -100px;
}

@keyframes grid-scroll {
    0% {
        transform: perspective(500px) rotateX(60deg) translateY(0);
    }
    100% {
        transform: perspective(500px) rotateX(60deg) translateY(80px);
    }
}

/* App Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    justify-content: space-between;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 3rem;
    letter-spacing: 6px;
    margin-bottom: 4px;
}

.subtitle {
    font-size: 0.9rem;
    letter-spacing: 4px;
    color: var(--color-text-secondary);
    font-weight: 600;
    text-transform: uppercase;
}

/* Glowing text classes */
.glow-text {
    color: #fff;
    text-shadow: 
        0 0 5px #fff,
        0 0 10px var(--neon-cyan),
        0 0 20px var(--neon-cyan),
        0 0 40px var(--neon-cyan);
}

.glow-text-cyan {
    color: #fff;
    text-shadow: 
        0 0 5px #fff,
        0 0 10px var(--neon-cyan),
        0 0 20px var(--neon-cyan);
}

.glow-text-yellow {
    color: #fff;
    text-shadow: 
        0 0 5px #fff,
        0 0 10px var(--neon-yellow),
        0 0 20px var(--neon-yellow);
}

.glow-text-magenta {
    color: #fff;
    text-shadow: 
        0 0 5px #fff,
        0 0 10px var(--neon-magenta),
        0 0 20px var(--neon-magenta);
}

/* Main Area */
.game-area {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 24px;
    width: 100%;
    margin-bottom: 20px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 200px;
}

/* Glassmorphism panels */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--bg-panel-border);
    border-radius: 16px;
    padding: 16px;
    box-shadow: 
        0 8px 32px 0 rgba(0, 0, 0, 0.3),
        inset 0 1px 1px rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    border-color: rgba(0, 240, 255, 0.2);
    box-shadow: 
        0 8px 32px 0 rgba(0, 0, 0, 0.4),
        0 0 15px var(--bg-panel-glow),
        inset 0 1px 1px rgba(255, 255, 255, 0.07);
}

.panel-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 8px;
}

.preview-box {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
}

/* Audio Controls */
.audio-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    color: var(--neon-cyan);
}

.icon {
    width: 22px;
    height: 22px;
}

.slider-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    height: 6px;
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--neon-cyan);
    cursor: pointer;
    box-shadow: 0 0 6px var(--neon-cyan);
    transition: all 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.25);
    box-shadow: 0 0 10px var(--neon-cyan);
}

#volume-val {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-family: 'Orbitron', sans-serif;
}

/* Board Main Area */
.board-container {
    position: relative;
}

.board-frame {
    padding: 8px;
    position: relative;
    overflow: hidden;
}

#game-canvas {
    background: rgba(5, 6, 15, 0.8);
    display: block;
    border-radius: 8px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
}

/* Screen Overlays */
.screen-overlay {
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    bottom: 8px;
    background: rgba(6, 7, 20, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    z-index: 5;
}

.screen-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.overlay-content {
    text-align: center;
    padding: 20px;
    width: 90%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.overlay-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.6rem;
    font-weight: 900;
    letter-spacing: 2px;
}

.overlay-desc {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.input-container {
    width: 100%;
}

#player-name-input {
    width: 80%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
    padding: 10px 16px;
    border-radius: 8px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    text-align: center;
    outline: none;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

#player-name-input:focus {
    border-color: var(--neon-cyan);
    background: rgba(0, 240, 255, 0.05);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

.action-btn {
    background: transparent;
    border-radius: 8px;
    padding: 12px 24px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    letter-spacing: 2px;
}

.action-btn:hover {
    transform: translateY(-2px);
}

.glow-btn-cyan {
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
}
.glow-btn-cyan:hover {
    background: var(--neon-cyan);
    color: var(--bg-dark);
    box-shadow: 0 0 20px var(--neon-cyan);
}

.glow-btn-yellow {
    border: 1px solid var(--neon-yellow);
    color: var(--neon-yellow);
}
.glow-btn-yellow:hover {
    background: var(--neon-yellow);
    color: var(--bg-dark);
    box-shadow: 0 0 20px var(--neon-yellow);
}

.glow-btn-magenta {
    border: 1px solid var(--neon-magenta);
    color: var(--neon-magenta);
}
.glow-btn-magenta:hover {
    background: var(--neon-magenta);
    color: var(--bg-dark);
    box-shadow: 0 0 20px var(--neon-magenta);
}

/* Game Over Details */
.final-score-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 12px 24px;
    width: 80%;
}

.final-score-label {
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.final-score-number {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
}

/* Stats panel */
#stats-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stat-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: 2px;
}

.stat-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
}

.text-glow-cyan {
    color: var(--neon-cyan);
    text-shadow: 0 0 6px rgba(0, 240, 255, 0.5);
}

.text-glow-yellow {
    color: var(--neon-yellow);
    text-shadow: 0 0 6px rgba(255, 223, 0, 0.5);
}

.text-glow-magenta {
    color: var(--neon-magenta);
    text-shadow: 0 0 6px rgba(255, 0, 127, 0.5);
}

/* Leaderboard */
.leaderboard-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.8rem;
}

.leaderboard-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 8px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.02);
    border-left: 2px solid transparent;
}

.leaderboard-list li.highlight {
    background: rgba(0, 240, 255, 0.05);
    border-left-color: var(--neon-cyan);
}

.leaderboard-name {
    font-weight: 600;
    color: var(--color-text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100px;
}

.leaderboard-score {
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-secondary);
}

.leaderboard-list li.highlight .leaderboard-score {
    color: var(--neon-cyan);
    font-weight: 700;
}

/* Virtual Controls (Touch Interface) */
.virtual-controls {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    width: 320px;
    margin-top: 10px;
}

.control-btn {
    background: rgba(13, 16, 37, 0.4);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--bg-panel-border);
    border-radius: 12px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    -webkit-user-select: none;
}

.control-btn:active {
    background: rgba(0, 240, 255, 0.15);
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
    box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
    transform: scale(0.95);
}

/* Footer Instructions */
.app-footer {
    text-align: center;
    margin-top: 16px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

kbd {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    padding: 1px 5px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    color: var(--color-text-primary);
}

/* Animation utilities */
.animate-pulse {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

/* Screen shake class (applied to canvas wrapper via code) */
.screen-shake {
    animation: shake 0.2s cubic-bezier(.36,.07,.19,.97) both;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-2px, 0, 0); }
    20%, 80% { transform: translate3d(4px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-6px, 0, 0); }
    40%, 60% { transform: translate3d(6px, 0, 0); }
}

/* Responsive Scaling */
@media (max-width: 768px) {
    .app-container {
        padding: 10px;
    }

    h1 {
        font-size: 2.2rem;
    }

    .game-area {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }

    .sidebar {
        flex-direction: row;
        width: 316px;
        justify-content: space-between;
    }

    .sidebar.left-sidebar {
        order: 2;
    }
    
    .sidebar.right-sidebar {
        order: 3;
    }

    .hud-panel {
        width: 148px;
        padding: 10px;
    }

    #leaderboard-panel, #audio-panel {
        display: none; /* Hide non-critical panels on mobile to fit the screen */
    }

    .preview-box {
        height: 80px;
    }

    #hold-canvas, #next-canvas {
        width: 80px;
        height: 80px;
    }

    .board-container {
        order: 1;
    }

    #game-canvas {
        width: 250px;
        height: 500px;
    }
    
    .board-frame {
        padding: 4px;
    }

    .screen-overlay {
        top: 4px;
        left: 4px;
        right: 4px;
        bottom: 4px;
    }

    .overlay-title {
        font-size: 1.2rem;
    }

    .virtual-controls {
        width: 310px;
        grid-template-columns: repeat(3, 1fr);
    }
    
    .app-footer {
        display: none; /* Keyboard hints not needed on mobile */
    }
}