:root {
    --bg-color: #050510;
    --primary-neon: #0ff;
    --secondary-neon: #f0f;
    --accent-neon: #0f0;
    --danger-neon: #f00;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #fff;
    --font-heading: 'Orbitron', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-mono);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    background: rgba(5, 5, 16, 0.6);
    backdrop-filter: blur(5px);
    transition: opacity 0.3s ease;
}

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

/* Glassmorphism Panel */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.1);
    text-align: center;
    min-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Typography */
.neon-text {
    font-family: var(--font-heading);
    font-size: 3rem;
    color: var(--text-main);
    text-shadow:
        0 0 5px var(--primary-neon),
        0 0 10px var(--primary-neon),
        0 0 20px var(--primary-neon);
    margin-bottom: 0.5rem;
}

.neon-text.red {
    text-shadow:
        0 0 5px var(--danger-neon),
        0 0 10px var(--danger-neon),
        0 0 20px var(--danger-neon);
}

.subtitle {
    font-size: 1rem;
    letter-spacing: 0.2rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 2rem;
}

/* Settings Controls */
.settings-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.settings-group label {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--secondary-neon);
}

.toggle-group {
    display: flex;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
}

.toggle-group button {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.5);
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.toggle-group button:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}

.toggle-group button.active {
    background: var(--primary-neon);
    color: #000;
    box-shadow: 0 0 10px var(--primary-neon);
    font-weight: bold;
}

/* Main Buttons */
.primary-btn,
.secondary-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    margin-top: 1rem;
}

.primary-btn {
    background: transparent;
    border: 2px solid var(--primary-neon);
    color: var(--primary-neon);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.2) inset;
}

.primary-btn:hover {
    background: var(--primary-neon);
    color: #000;
    box-shadow: 0 0 20px var(--primary-neon);
}

.secondary-btn {
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
}

.secondary-btn:hover {
    color: #fff;
    text-shadow: 0 0 8px #fff;
}

/* HUD */
.hud {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    z-index: 5;
    pointer-events: none;
}

.hud.hidden {
    display: none;
}

.score-container,
.lives-container {
    font-family: var(--font-heading);
    color: #fff;
    font-size: 1.5rem;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.lives-container {
    color: var(--danger-neon);
    text-shadow: 0 0 10px var(--danger-neon);
}

/* Keyboard Styles */
.keyboard-container {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 5;
    background: rgba(0, 0, 0, 0.3);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    pointer-events: none;
}

.hands-overlay {
    position: absolute;
    top: -50px;
    /* Adjust based on image aspect ratio and desired hand position */
    left: -10%;
    width: 120%;
    height: 140%;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.6;
    z-index: 10;
    pointer-events: none;
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.key {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
    position: relative;
    box-shadow: 0 4px 0 rgba(0, 0, 0, 0.5);
    transition: transform 0.1s, box-shadow 0.1s;
}

.key.zhuyin-mode {
    color: var(--primary-neon);
    font-weight: bold;
}