:root {
    --bg-color: #030308;
    --neon-blue: #00f0ff;
    --neon-orange: #ffaa00;
    --neon-pink: #ff0077;
    --neon-green: #00ff66;
    --neon-gold: #ffd700;
    --neon-purple: #bd00ff;
    --white: #ffffff;
    --grey: #888899;
    --glass-bg: rgba(6, 6, 15, 0.75);
    --font-arcade: 'Press Start 2P', monospace;
    --font-hud: 'Orbitron', sans-serif;
}

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

body, html {
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    color: var(--white);
    font-family: var(--font-arcade);
    overflow: hidden;
    position: relative;
}

/* CRT Screen Effect Overlay */
.crt-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 4px, 6px 100%;
    z-index: 100;
    pointer-events: none;
    opacity: 0.85;
}

.crt-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-shadow: inset 0 0 80px rgba(0, 240, 255, 0.15);
    z-index: 101;
    pointer-events: none;
}

#game-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    background-color: #020205;
}

/* Menu Overlays */
.menu-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 10;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease, visibility 0.3s;
    padding: 20px;
    text-align: center;
}

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

.menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Typography */
.game-title {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: 4px;
    color: var(--white);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5), 0 0 20px var(--neon-blue), 0 0 30px var(--neon-blue);
    margin-bottom: 10px;
    animation: title-pulse 2s infinite ease-in-out;
}

.game-subtitle {
    font-size: 0.9rem;
    letter-spacing: 2px;
    color: var(--neon-pink);
    text-shadow: 0 0 8px rgba(255, 0, 119, 0.6);
    margin-bottom: 40px;
}

/* Buttons */
.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 100%;
    max-width: 320px;
}

.menu-btn {
    width: 100%;
    padding: 15px 20px;
    font-family: var(--font-arcade);
    font-size: 0.85rem;
    color: var(--white);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--neon-blue);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.15);
}

.menu-btn:hover {
    background: var(--neon-blue);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--neon-blue);
    text-shadow: none;
    transform: translateY(-2px);
}

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

.menu-btn.secondary {
    border-color: var(--neon-pink);
    box-shadow: 0 0 10px rgba(255, 0, 119, 0.15);
}

.menu-btn.secondary:hover {
    background: var(--neon-pink);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--neon-pink);
}

/* Options / Controls Screen styling */
h2 {
    font-size: 1.8rem;
    color: var(--neon-blue);
    text-shadow: 0 0 8px var(--neon-blue);
    margin-bottom: 30px;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    width: 100%;
    max-width: 750px;
    margin-bottom: 30px;
}

@media (max-width: 600px) {
    .controls-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
}

.player-controls {
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--neon-blue);
    padding: 20px;
    border-radius: 6px;
    text-align: left;
}

.player-controls.p2-info {
    border-color: var(--neon-orange);
}

.player-controls h3 {
    font-size: 0.8rem;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 8px;
    color: var(--neon-blue);
}

.player-controls.p2-info h3 {
    color: var(--neon-orange);
}

.player-controls ul {
    list-style: none;
    font-size: 0.65rem;
    line-height: 1.8;
}

.player-controls ul li {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
}

.player-controls ul li span {
    color: var(--grey);
}

/* Options styling */
.options-container {
    width: 100%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--neon-purple);
    padding: 25px;
    border-radius: 6px;
}

.option-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    color: var(--white);
}

.option-row select, .option-row input[type="checkbox"] {
    background: #090915;
    border: 1px solid var(--neon-purple);
    color: var(--white);
    padding: 5px 10px;
    font-family: var(--font-arcade);
    font-size: 0.65rem;
    outline: none;
    cursor: pointer;
}

.option-row input[type="range"] {
    width: 150px;
    accent-color: var(--neon-purple);
}

/* Game Stats (Game Over screen) */
.game-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    width: 100%;
    max-width: 500px;
}

.player-stat-box {
    flex: 1;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--neon-blue);
    padding: 20px 10px;
    border-radius: 4px;
}

.player-stat-box.hidden {
    display: none;
}

.player-stat-box h3 {
    font-size: 0.7rem;
    color: var(--grey);
    margin-bottom: 10px;
}

.stat-value {
    font-size: 1.5rem;
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
    margin-bottom: 5px;
}

.stat-sub {
    font-size: 0.55rem;
    color: var(--grey);
}

.high-score-board {
    margin-top: 40px;
    font-size: 0.8rem;
    color: var(--neon-gold);
    text-shadow: 0 0 8px rgba(255, 215, 0, 0.4);
    letter-spacing: 1px;
}

/* Heads-Up Display (HUD) */
.hud-container {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    z-index: 5;
    font-family: var(--font-hud);
}

.hud-container.hidden {
    display: none;
}

.hud-player-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hud-player-info.hidden {
    display: none;
}

.hud-label {
    font-size: 0.9rem;
    font-weight: 700;
}

.p1-label {
    color: var(--neon-blue);
}

.p2-label {
    color: var(--neon-orange);
}

.hud-value {
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 1px;
}

.hud-lives {
    display: flex;
    gap: 5px;
    margin-top: 2px;
}

.hud-life-icon {
    width: 12px;
    height: 16px;
    display: inline-block;
    background-color: var(--neon-blue);
    clip-path: polygon(50% 0%, 0% 100%, 50% 75%, 100% 100%);
}

#p2-lives .hud-life-icon {
    background-color: var(--neon-orange);
}

.hud-shield-container {
    width: 80px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 4px;
}

.hud-shield-bar {
    height: 100%;
    width: 100%;
    background: var(--neon-blue);
    box-shadow: 0 0 5px var(--neon-blue);
    transition: width 0.2s ease;
}

#p2-hud .hud-shield-bar {
    background: var(--neon-orange);
    box-shadow: 0 0 5px var(--neon-orange);
}

.level-indicator {
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--neon-pink);
    text-shadow: 0 0 5px var(--neon-pink);
    letter-spacing: 2px;
}

/* HUD Menu Toggle Button for Touch/General */
.hud-menu-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 6;
    padding: 6px 12px;
    font-family: var(--font-hud);
    font-weight: bold;
    font-size: 0.8rem;
    color: var(--white);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    cursor: pointer;
    pointer-events: auto;
}

.hud-menu-btn.hidden {
    display: none;
}

/* Touch Controls Layout */
.touch-controls-container {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 180px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px 20px 30px;
    pointer-events: none;
    z-index: 8;
}

.touch-controls-container.hidden {
    display: none !important;
}

.touch-left, .touch-center, .touch-right {
    pointer-events: auto;
    display: flex;
    align-items: center;
}

.touch-left {
    justify-content: flex-start;
}

.touch-center {
    justify-content: center;
    flex-direction: column;
    gap: 12px;
}

.touch-right {
    justify-content: flex-end;
    gap: 15px;
}

/* Joystick Styles */
.joystick-base {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(0, 240, 255, 0.3);
    position: relative;
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.1);
}

.joystick-knob {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--neon-blue);
    border: 2px solid var(--white);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 15px var(--neon-blue);
    transition: transform 0.05s ease;
}

/* Touch Button Styles */
.touch-btn {
    font-family: var(--font-hud);
    font-weight: 700;
    border-radius: 50%;
    border: none;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.5);
    transition: transform 0.1s, opacity 0.1s;
}

.touch-btn:active {
    transform: scale(0.92);
    opacity: 0.8;
}

.action-btn {
    width: 76px;
    height: 76px;
    font-size: 0.9rem;
}

.shoot-btn {
    background: var(--neon-pink);
    color: var(--white);
    border: 2px solid var(--white);
    box-shadow: 0 0 15px var(--neon-pink);
}

.thrust-btn {
    background: var(--neon-green);
    color: var(--bg-color);
    border: 2px solid var(--white);
    box-shadow: 0 0 15px var(--neon-green);
}

.secondary-btn {
    width: 80px;
    height: 36px;
    border-radius: 18px;
    font-size: 0.7rem;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--grey);
    color: var(--white);
}

/* Animations */
@keyframes title-pulse {
    0%, 100% {
        text-shadow: 0 0 10px rgba(255, 255, 255, 0.5), 0 0 20px var(--neon-blue), 0 0 35px var(--neon-blue);
    }
    50% {
        text-shadow: 0 0 15px rgba(255, 255, 255, 0.7), 0 0 30px var(--neon-blue), 0 0 50px var(--neon-blue);
    }
}