:root {
    --bg-dark: #0a0a0f;
    --neon-blue: #00f3ff;
    --neon-purple: #bc13fe;
    --neon-pink: #ff0055;
    --glass-bg: rgba(20, 20, 30, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #ffffff;
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    overflow: hidden;
    touch-action: none; /* Prevent scroll on mobile */
    width: 100vw;
    height: 100vh;
}

/* 3D Background */
#ui-background {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    perspective: 1000px;
    overflow: hidden;
    background: radial-gradient(circle at center, #1a1a2e 0%, #000 100%);
}

.grid-floor {
    position: absolute;
    bottom: -50%; left: -50%;
    width: 200%; height: 200%;
    background-image: 
        linear-gradient(rgba(0, 243, 255, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 243, 255, 0.3) 1px, transparent 1px);
    background-size: 50px 50px;
    transform: rotateX(75deg);
    animation: moveGrid 2s linear infinite;
}

@keyframes moveGrid {
    0% { transform: rotateX(75deg) translateY(0); }
    100% { transform: rotateX(75deg) translateY(50px); }
}

/* UI Screens */
.screen {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, transform 0.5s ease;
    z-index: 10;
}

.screen.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(1.1);
}

.screen.active {
    opacity: 1;
    pointer-events: all;
    transform: scale(1);
    backdrop-filter: blur(5px);
}

/* Logo */
.logo-container {
    text-align: center;
    margin-bottom: 50px;
}

.glitch {
    font-family: var(--font-heading);
    font-size: 5rem;
    font-weight: 900;
    color: var(--text-main);
    text-transform: uppercase;
    position: relative;
    text-shadow: 0 0 10px var(--neon-blue), 0 0 20px var(--neon-purple);
}

.subtitle {
    font-size: 2rem;
    letter-spacing: 15px;
    color: var(--neon-pink);
    text-transform: uppercase;
}

/* Buttons */
.btn {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    padding: 15px 40px;
    margin: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 2px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn.premium {
    background: linear-gradient(45deg, var(--neon-purple), var(--neon-blue));
    color: white;
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.5);
}

.btn.premium:hover {
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.8), inset 0 0 10px rgba(255,255,255,0.5);
    transform: translateY(-2px) scale(1.05);
}

.btn.glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    backdrop-filter: blur(10px);
}

.btn.glass:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--neon-blue);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
}

.btn.minor-btn {
    padding: 5px 15px;
    font-size: 0.9rem;
    margin: 0 0 10px 0;
    pointer-events: all;
}

.btn.block {
    display: block;
    width: 100%;
    margin: 10px 0;
}

/* Panels */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(15px);
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(255,255,255,0.1);
    position: relative;
}

.btn-close {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, #ff0055, #bc13fe);
    color: white;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    padding: 10px 30px;
    border: 2px solid white;
    border-radius: 25px;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(255, 0, 85, 0.6), inset 0 0 5px rgba(255,255,255,0.5);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 2px;
    z-index: 10;
}

.btn-close:hover {
    transform: translateX(-50%) translateY(-3px) scale(1.05);
    box-shadow: 0 0 25px rgba(255, 0, 85, 0.9), inset 0 0 10px rgba(255,255,255,0.8);
    border-color: var(--neon-blue);
}

.glass-panel h2 {
    font-family: var(--font-heading);
    color: var(--neon-blue);
    margin-bottom: 20px;
    font-size: 2rem;
}

.glass-panel.wide {
    width: 80%;
    max-width: 900px;
}

/* Garage */
.garage-content {
    display: flex;
    justify-content: space-between;
    gap: 40px;
}

.car-display {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#garage-canvas {
    width: 100%;
    height: auto;
    border-radius: 10px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
}

.upgrades {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.stat-row {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.stat-row span {
    width: 100px;
    text-align: left;
}

.bar-bg {
    flex: 1;
    height: 10px;
    background: rgba(0,0,0,0.5);
    border-radius: 5px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--neon-blue);
    width: 50%;
    box-shadow: 0 0 10px var(--neon-blue);
    transition: width 0.3s ease;
}

.car-selector {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.mt-4 { margin-top: 25px; }

/* Leaderboard */
.leaderboard-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 10px 0;
}
.lb-row {
    display: flex;
    justify-content: space-between;
    background: rgba(0, 0, 0, 0.4);
    padding: 15px 20px;
    border-radius: 8px;
    border-left: 4px solid var(--neon-blue);
    font-size: 1.2rem;
}
.lb-label.city-color { color: #00f3ff; }
.lb-label.mtn-color { color: #bc13fe; }
.lb-label.desert-color { color: #ffdd00; }

/* Settings */
.settings-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.4);
    padding: 15px 20px;
    border-radius: 8px;
    font-size: 1.2rem;
}
.toggle-btn {
    min-width: 80px;
}
.toggle-btn.off {
    color: #ff5555;
    border-color: #ff5555;
}

.result-stats {
    margin-top: 20px;
    font-size: 1.5rem;
}

.nav-btn {
    padding: 5px 15px;
}

/* Track Selection */
.track-list {
    display: flex;
    gap: 10px;
}
.action-buttons {
    margin-top: 15px;
}
#car-owned-msg {
    text-align: center;
    padding: 15px;
    background: rgba(0, 243, 255, 0.1);
    color: var(--neon-blue);
    border-radius: 5px;
    font-weight: bold;
    letter-spacing: 2px;
}
.car-selector {
    background: rgba(0,0,0,0.6);
    border: 2px solid transparent;
    border-radius: 10px;
    padding: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 200px;
}

.track-card:hover, .track-card.selected {
    border-color: var(--neon-pink);
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(255, 0, 85, 0.3);
}

.track-card.locked {
    opacity: 0.5;
    filter: grayscale(1);
    pointer-events: none;
}

.track-img {
    height: 120px;
    background-color: #333;
    border-radius: 5px;
    margin-bottom: 10px;
    background-size: cover;
    background-position: center;
    border: 1px solid rgba(255,255,255,0.2);
}

.city-bg {
    background-image: url('../assets/track_city.png');
}

.mountain-bg {
    background-image: url('../assets/track_mountain.png');
}

.desert-bg {
    background-image: url('../assets/track_desert.png');
}

/* Instructions */
.instructions-list {
    list-style: none;
    text-align: left;
    margin: 20px 0;
    font-size: 1.2rem;
}

.instructions-list li {
    margin-bottom: 10px;
}

.key, .touch-icon {
    display: inline-block;
    padding: 2px 8px;
    background: #333;
    border-radius: 4px;
    border: 1px solid #555;
    font-family: monospace;
    font-weight: bold;
}

/* Game Canvas & HUD */
#game-container {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 5;
    background: #111;
}

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

#hud {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none;
}

.hud-top {
    display: flex;
    justify-content: space-between;
    padding: 20px;
    font-family: var(--font-heading);
    text-shadow: 0 0 5px black;
}

.hud-score, .hud-position, .hud-center {
    background: rgba(0,0,0,0.5);
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    text-align: center;
    pointer-events: none; /* Keep text unclickable */
    display: flex;
    flex-direction: column;
    align-items: center;
}

.glow-text {
    font-size: 2rem;
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue);
}

#drift-alert {
    position: absolute;
    top: 30%; left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    font-family: var(--font-heading);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    0% { transform: translate(-50%, -50%) scale(0.5); opacity: 0; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

#drift-points {
    font-size: 4rem;
    color: var(--neon-purple);
    text-shadow: 0 0 20px var(--neon-purple);
    font-weight: 900;
    -webkit-text-stroke: 1px white;
}

#drift-combo {
    font-size: 2rem;
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink);
}

.hud-bottom {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.speedometer {
    width: 150px;
    height: 150px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    position: relative;
    border: 2px solid var(--neon-blue);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.speed-ring {
    position: absolute;
    width: 90%; height: 90%;
    border-radius: 50%;
    border: 5px dashed rgba(255,255,255,0.2);
}

.speed-val {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 900;
    z-index: 2;
}

.speed-val small {
    display: block;
    font-size: 0.8rem;
    color: #aaa;
    margin-top: -10px;
}

.minimap {
    background: rgba(0,0,0,0.6);
    border: 2px solid var(--glass-border);
    border-radius: 10px;
    overflow: hidden;
}

/* Mobile Controls */
#mobile-controls {
    display: none;
    position: absolute;
    bottom: 20px; left: 0; width: 100%;
    justify-content: space-between;
    padding: 0 20px;
    pointer-events: none;
}

.t-btn {
    pointer-events: all;
    background: rgba(255,255,255,0.1);
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    width: 70px; height: 70px;
    color: white;
    font-size: 1.5rem;
    font-family: var(--font-heading);
    backdrop-filter: blur(5px);
    margin: 5px;
}

.t-btn:active {
    background: rgba(255,255,255,0.3);
    border-color: var(--neon-blue);
    box-shadow: 0 0 15px var(--neon-blue);
}

.t-btn.brake { background: rgba(255,0,85,0.2); border-radius: 15px; width: 80px; }
.t-btn.accel { background: rgba(0,243,255,0.2); border-radius: 15px; width: 80px; }

@media (max-width: 768px) {
    #mobile-controls { display: flex; }
    .hud-bottom { bottom: 120px; }
    .glitch { font-size: 3rem; }
    .garage-content { flex-direction: column; }
    .glass-panel.wide { width: 95%; max-height: 90vh; overflow-y: auto; }
}

/* Utils */
.mt-4 { margin-top: 20px; }