/* Cube Dash - Next-Gen Gaming Experience */
/* Modern Glassmorphism UI with Parallax Effects */

:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    /* Glass Effect Variables */
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --glass-blur: blur(12px);

    /* Dark Theme Variables */
    --bg-dark: #0a0a0f;
    --text-dark: #ffffff;
    --glass-dark: rgba(0, 0, 0, 0.3);
    --border-dark: rgba(255, 255, 255, 0.1);

    /* Light Theme Variables */
    --bg-light: #f8fafc;
    --text-light: #1e293b;
    --glass-light: rgba(255, 255, 255, 0.7);
    --border-light: rgba(0, 0, 0, 0.1);

    /* Animation Variables */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Z-Index Scale */
    --z-background: -1;
    --z-game: 1;
    --z-ui: 10;
    --z-overlay: 100;
    --z-modal: 1000;
    --z-toast: 10000;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-primary);
    background: var(--primary-gradient);
    color: var(--text-dark);
    overflow: hidden;
    height: 100vh;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    position: relative;
}

/* Dark/Light Theme Support */
[data-theme="light"] {
    --glass-bg: var(--glass-light);
    --glass-border: var(--border-light);
    color: var(--text-light);
    background: linear-gradient(135deg, #e0e7ff 0%, #f1f5f9 100%);
}

[data-theme="dark"] {
    --glass-bg: var(--glass-dark);
    --glass-border: var(--border-dark);
    color: var(--text-dark);
    background: var(--primary-gradient);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: var(--space-md);
    left: var(--space-md);
    z-index: var(--z-ui);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.2rem;
}

.settings-toggle {
    position: fixed;
    top: var(--space-md);
    left: calc(var(--space-md) + 60px);
    z-index: var(--z-ui);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.2rem;
}

/* Game Container */
.game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* Parallax Background System */
.parallax-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-background);
    overflow: hidden;
}

.bg-layer {
    position: absolute;
    width: 120%;
    height: 120%;
    top: -10%;
    left: -10%;
    background-size: cover;
    background-repeat: repeat;
    opacity: 0.6;
    animation: parallaxFloat 20s ease-in-out infinite;
}

.bg-layer-1 {
    background: radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.4) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%);
    animation-delay: 0s;
    transform: translateX(0);
}

.bg-layer-2 {
    background: radial-gradient(circle at 60% 60%, rgba(120, 219, 255, 0.3) 0%, transparent 40%),
                radial-gradient(circle at 40% 40%, rgba(255, 200, 119, 0.2) 0%, transparent 60%);
    animation-delay: -5s;
    transform: translateX(-10px);
}

.bg-layer-3 {
    background: radial-gradient(circle at 80% 80%, rgba(180, 119, 255, 0.2) 0%, transparent 70%),
                radial-gradient(circle at 20% 20%, rgba(119, 255, 180, 0.2) 0%, transparent 50%);
    animation-delay: -10s;
    transform: translateX(-20px);
}

.bg-layer-4 {
    background: radial-gradient(circle at 30% 70%, rgba(255, 180, 119, 0.1) 0%, transparent 80%);
    animation-delay: -15s;
    transform: translateX(-30px);
}

@keyframes parallaxFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(1deg); }
    66% { transform: translateY(10px) rotate(-1deg); }
}

/* Particle System */
.particle-system {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-game);
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    animation: particleFloat 4s linear infinite;
}

@keyframes particleFloat {
    0% { 
        transform: translateY(100vh) scale(0); 
        opacity: 0; 
    }
    10% { 
        opacity: 1; 
        transform: scale(1); 
    }
    90% { 
        opacity: 1; 
    }
    100% { 
        transform: translateY(-100px) scale(0); 
        opacity: 0; 
    }
}

/* Game Canvas */
#gameCanvas {
    border-radius: 20px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.3),
        inset 0 0 60px rgba(255, 255, 255, 0.1);
    background: linear-gradient(180deg, #000510 0%, #001122 100%);
    position: relative;
    z-index: var(--z-game);
    max-width: 90vw;
    max-height: 70vh;
}

/* Glassmorphism Components */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
    padding: var(--space-md);
    transition: var(--transition-smooth);
}

.glass-button {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: var(--glass-shadow);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-primary);
    font-weight: 600;
    color: inherit;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.glass-button:hover {
    transform: translateY(-2px);
    box-shadow: 
        var(--glass-shadow),
        0 12px 40px rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.25);
}

.glass-button:active {
    transform: translateY(0);
    transition: var(--transition-smooth);
}

.glass-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
}

.glass-screen.active {
    opacity: 1;
    visibility: visible;
}

/* UI Overlay */
.ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-ui);
    padding: var(--space-md);
}

/* Top Bar */
.top-bar {
    position: absolute;
    top: var(--space-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--space-lg);
    align-items: center;
    padding: var(--space-sm) var(--space-lg);
    pointer-events: auto;
}

.stat-group {
    display: flex;
    gap: var(--space-lg);
}

.stat-item {
    text-align: center;
    min-width: 80px;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    opacity: 0.8;
    letter-spacing: 1px;
    margin-bottom: var(--space-xs);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-shadow: 0 0 20px currentColor;
}

.combo-value {
    color: #ff6b6b;
    transform: scale(1);
    transition: var(--transition-bounce);
}

.combo-value.active {
    transform: scale(1.2);
    animation: comboGlow 0.5s ease-out;
}

@keyframes comboGlow {
    0% { text-shadow: 0 0 20px #ff6b6b; }
    50% { text-shadow: 0 0 40px #ff6b6b, 0 0 60px #ff6b6b; }
    100% { text-shadow: 0 0 20px #ff6b6b; }
}

/* Progress Group */
.progress-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.level-progress {
    text-align: center;
}

.progress-bar {
    width: 200px;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-label {
    font-size: 0.7rem;
    opacity: 0.8;
    letter-spacing: 1px;
}

/* Power-up Display */
.powerup-display {
    position: absolute;
    top: 100px;
    right: var(--space-md);
    width: 80px;
    height: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: var(--transition-smooth);
    pointer-events: auto;
}

.powerup-display.active {
    opacity: 1;
    transform: scale(1);
}

.powerup-icon {
    font-size: 2rem;
    margin-bottom: var(--space-xs);
}

.powerup-timer {
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

/* Streak Display */
.streak-display {
    position: absolute;
    top: 100px;
    left: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    opacity: 0;
    transform: translateX(-100%);
    transition: var(--transition-smooth);
    pointer-events: auto;
}

.streak-display.active {
    opacity: 1;
    transform: translateX(0);
}

.streak-flame {
    font-size: 1.5rem;
    animation: flameFlicker 0.5s ease-in-out infinite alternate;
}

@keyframes flameFlicker {
    0% { transform: scale(1) rotate(-2deg); }
    100% { transform: scale(1.1) rotate(2deg); }
}

.streak-count {
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

/* Start Screen */
.start-screen .screen-content {
    max-width: 95vw;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-height: 95vh;
    overflow: hidden;
    padding: var(--space-sm);
    justify-content: center;
}

.game-logo {
    margin-bottom: var(--space-xs);
}

.logo-cube {
    font-size: 2.5rem;
    margin-bottom: var(--space-xs);
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(3deg); }
}

.game-logo h1 {
    font-size: 2rem;
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-xs);
    letter-spacing: 1px;
}

.logo-subtitle {
    font-size: 0.75rem;
    opacity: 0.8;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Controls Info */
.controls-info h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    text-align: center;
}

.controls-info h4 {
    font-size: 0.8rem;
    font-weight: 600;
    margin: var(--space-xs) 0 var(--space-xs) 0;
    text-align: center;
}

/* Character Selector */
.character-grid {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.character-option {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: var(--space-sm);
    cursor: pointer;
    transition: var(--transition-smooth);
    text-align: center;
    min-width: 80px;
    position: relative;
}

.character-option:hover:not(.locked) {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.character-option.selected {
    background: var(--success-gradient);
    border-color: rgba(255, 255, 255, 0.4);
}

.character-option.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.character-preview {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
}

.character-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
    font-size: 0.8rem;
}

.unlock-req {
    font-size: 0.65rem;
    opacity: 0.7;
}

/* Controls Info */
.control-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xs);
    max-width: 200px;
    margin: 0 auto;
}

.control-item {
    text-align: center;
}

.key-display {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: var(--space-xs);
    font-family: var(--font-mono);
    font-weight: 600;
    margin-bottom: 2px;
    min-height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
}

.control-desc {
    font-size: 0.65rem;
    opacity: 0.8;
}

/* Start Button */
.start-button {
    font-size: 0.9rem;
    padding: var(--space-sm) var(--space-lg);
    margin: var(--space-sm) auto;
    position: relative;
    overflow: hidden;
    background: var(--primary-gradient);
    border: none;
    color: white;
    width: fit-content;
    min-height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.start-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s;
}

.start-button:hover::before {
    left: 100%;
}

.button-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
}

.start-button:hover .button-glow {
    opacity: 1;
}

/* Best Score */
.best-score {
    text-align: center;
    padding: var(--space-xs);
    margin: 0 auto;
    max-width: 130px;
}

.best-label {
    font-size: 0.7rem;
    opacity: 0.8;
    margin-bottom: 2px;
}

.best-value {
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #ffd93d;
}

/* Game Over Screen */
.game-over-title {
    font-size: 2rem;
    font-weight: 900;
    background: var(--success-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-lg);
    text-align: center;
}

.final-stats {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.main-stat {
    margin-bottom: var(--space-md);
}

.main-stat .stat-label {
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
}

.big-number {
    font-size: 2.5rem;
    font-weight: 900;
    font-family: var(--font-mono);
    color: #00ffff;
    text-shadow: 0 0 30px currentColor;
}

.sub-stats {
    display: flex;
    justify-content: space-around;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.sub-stat {
    text-align: center;
    min-width: 80px;
}

.sub-stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #ffd93d;
    margin-bottom: var(--space-xs);
}

.sub-stat-label {
    font-size: 0.7rem;
    opacity: 0.8;
}

/* Achievements Display */
.achievements-display {
    margin-bottom: var(--space-lg);
    max-height: 150px;
    overflow-y: auto;
}

.achievement-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.achievement-item-icon {
    font-size: 1.2rem;
}

.achievement-item-text {
    flex: 1;
}

.achievement-item-title {
    font-weight: 600;
    margin-bottom: 2px;
    font-size: 0.8rem;
}

.achievement-item-desc {
    font-size: 0.7rem;
    opacity: 0.8;
}

/* Rank Display */
.rank-display {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.rank-title {
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.rank-badge {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.rank-letter {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--warning-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 900;
    color: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.rank-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.rank-progress {
    max-width: 250px;
    margin: 0 auto;
}

.rank-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.rank-fill {
    height: 100%;
    background: var(--warning-gradient);
    border-radius: 3px;
    transition: width 1s ease;
    width: 0%;
}

.rank-text {
    font-size: 0.75rem;
    opacity: 0.8;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.action-button {
    font-size: 0.9rem;
    padding: var(--space-sm) var(--space-md);
    min-width: 100px;
}

.action-button.secondary {
    background: rgba(255, 255, 255, 0.1);
}

/* Settings Overlay */
.settings-content {
    max-width: 450px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
}

.settings-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-lg);
}

.settings-section {
    margin-bottom: var(--space-lg);
}

.settings-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: #ffd93d;
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

.setting-item label {
    font-weight: 500;
    flex: 1;
    font-size: 0.9rem;
}

.setting-item input[type="range"] {
    flex: 1;
    max-width: 100px;
    margin: 0 var(--space-sm);
}

.setting-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

.setting-item select {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: var(--space-xs) var(--space-sm);
    color: inherit;
    font-family: inherit;
}

.volume-value {
    font-family: var(--font-mono);
    font-weight: 600;
    min-width: 35px;
    text-align: right;
    font-size: 0.8rem;
}

.close-settings {
    width: 100%;
    margin-top: var(--space-md);
    padding: var(--space-sm);
    font-size: 1rem;
}

/* Mobile Controls */
.mobile-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--space-lg);
    z-index: 1000;
    pointer-events: auto;
}

@media (min-width: 768px) {
    .mobile-controls {
        display: none;
    }
}

.mobile-btn {
    width: 70px;
    height: 50px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.mobile-btn:active {
    transform: scale(0.95);
    background: rgba(255, 255, 255, 0.3);
}

/* Achievement Toast */
.achievement-toast {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    max-width: 250px;
    z-index: var(--z-toast);
    transform: translateX(100%);
    transition: var(--transition-smooth);
    pointer-events: none;
}

.achievement-toast.show {
    transform: translateX(0);
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 2px;
    font-size: 0.8rem;
}

.toast-desc {
    font-size: 0.7rem;
    opacity: 0.8;
}

/* Leaderboard */
.leaderboard-content {
    max-width: 450px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
}

.leaderboard-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-lg);
}

.leaderboard-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.tab-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: var(--space-sm) var(--space-md);
    font-family: inherit;
    font-weight: 500;
    color: inherit;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-size: 0.8rem;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.tab-btn.active {
    background: var(--accent-gradient);
    color: white;
}

.leaderboard-list {
    margin-bottom: var(--space-lg);
    max-height: 300px;
    overflow-y: auto;
}

.leaderboard-entry {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm);
    margin-bottom: var(--space-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.leaderboard-rank {
    font-weight: 700;
    font-family: var(--font-mono);
    color: #ffd93d;
    min-width: 30px;
    font-size: 0.8rem;
}

.leaderboard-name {
    flex: 1;
    font-weight: 500;
    margin-left: var(--space-sm);
    font-size: 0.8rem;
}

.leaderboard-score {
    font-weight: 700;
    font-family: var(--font-mono);
    color: #00ffff;
    font-size: 0.8rem;
}

.personal-rank {
    text-align: center;
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.rank-info, .rank-score {
    margin-bottom: var(--space-sm);
    font-size: 0.8rem;
}

.close-leaderboard {
    width: 100%;
    padding: var(--space-sm);
    font-size: 1rem;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
    transition: opacity 0.5s ease;
}

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

.loading-content {
    text-align: center;
    max-width: 350px;
    width: 90%;
}

.loading-logo {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    animation: logoFloat 2s ease-in-out infinite;
}

.loading-text {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: var(--space-lg);
    background: linear-gradient(45deg, #fff, #00ffff, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.loading-progress {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

.loading-status {
    font-size: 0.9rem;
    opacity: 0.8;
    font-weight: 500;
}

.loading-spinner {
    color: #ffffff;
    opacity: 0.7;
    animation: loadingPulse 1.5s ease-in-out infinite;
}

@keyframes loadingPulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* Game Overlays */
.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.menu-content {
    text-align: center;
    color: white;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 90vw;
}

.menu-content h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #00ff88, #0088ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.menu-content button {
    background: linear-gradient(45deg, #0088ff, #00ff88);
    border: none;
    padding: 0.8rem 1.5rem;
    margin: 0.4rem;
    border-radius: 50px;
    color: white;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.menu-content button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 136, 255, 0.3);
}

.controls-info {
    margin-top: 1.5rem;
    font-size: 0.8rem;
    opacity: 0.8;
}

/* Game HUD */
.game-hud {
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    display: flex;
    justify-content: space-between;
    z-index: 50;
    pointer-events: none;
}

.hud-item {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-weight: bold;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.8rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --space-md: 0.5rem;
        --space-lg: 0.75rem;
        --space-xl: 1rem;
    }

    #gameCanvas {
        width: 95vw;
        height: 50vh;
        max-width: none;
        max-height: none;
    }

    .mobile-controls {
        display: flex;
    }

    .top-bar {
        flex-direction: column;
        gap: var(--space-sm);
        padding: var(--space-sm);
        top: var(--space-sm);
    }

    .stat-group {
        gap: var(--space-md);
    }

    .stat-value {
        font-size: 1.2rem;
    }

    .game-logo h1 {
        font-size: 2rem;
        margin-bottom: var(--space-sm);
    }

    .start-screen .screen-content {
        gap: var(--space-sm);
        padding: var(--space-sm);
        max-height: 95vh;
    }

    .mode-buttons {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }

    .character-grid {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--space-xs);
    }

    .control-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xs);
    }

    .action-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--space-xs);
    }

    .settings-content,
    .leaderboard-content {
        padding: var(--space-md);
        width: 95%;
    }

    .final-stats .sub-stats {
        flex-direction: column;
        align-items: center;
    }

    .start-button {
        font-size: 0.9rem;
        padding: var(--space-md) var(--space-lg);
        margin: var(--space-md) auto;
        min-height: 45px;
    }

    .mobile-controls {
        display: flex;
        bottom: 15px;
    }

    .leaderboard-btn {
        font-size: 0.7rem;
        padding: var(--space-xs) var(--space-xs);
        top: var(--space-xs);
        right: var(--space-xs);
        min-width: 100px;
    }

    .theme-toggle,
    .settings-toggle {
        width: 40px;
        height: 40px;
        font-size: 1rem;
        top: var(--space-xs);
    }

    .settings-toggle {
        left: calc(var(--space-xs) + 50px);
    }

    .game-hud {
        flex-wrap: wrap;
        gap: 0.3rem;
        left: 10px;
        right: 10px;
    }

    .hud-item {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }

    .menu-content h1 {
        font-size: 1.5rem;
    }

    .menu-content button {
        font-size: 0.9rem;
        padding: 0.7rem 1.2rem;
    }
}

@media (max-width: 480px) {
    .stat-value {
        font-size: 1rem;
    }

    .mobile-btn {
        width: 45px;
        height: 45px;
        font-size: 0.6rem;
    }

    .game-logo h1 {
        font-size: 1.8rem;
    }

    .big-number {
        font-size: 2rem;
    }

    .loading-text {
        font-size: 1.8rem;
    }

    .start-screen .screen-content {
        gap: var(--space-xs);
        padding: var(--space-xs);
        max-height: 98vh;
    }

    .mode-btn, .character-option {
        padding: var(--space-xs);
        font-size: 0.8rem;
    }

    .control-grid {
        grid-template-columns: 1fr 1fr;
    }

    .key-display {
        padding: var(--space-xs);
        font-size: 0.7rem;
        min-height: 25px;
    }

    .character-preview {
        font-size: 1.2rem;
    }

    .character-name {
        font-size: 0.7rem;
    }

    .unlock-req {
        font-size: 0.6rem;
    }
}

@media (max-height: 700px) {
    .start-screen .screen-content {
        max-height: 98vh;
        gap: var(--space-xs);
    }

    .game-logo {
        margin-bottom: var(--space-xs);
    }

    .start-button {
        margin: var(--space-xs) auto;
    }

    .logo-cube {
        font-size: 2rem;
    }

    .game-logo h1 {
        font-size: 1.8rem;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --glass-bg: rgba(255, 255, 255, 0.9);
        --glass-border: rgba(0, 0, 0, 0.8);
    }

    [data-theme="dark"] {
        --glass-bg: rgba(0, 0, 0, 0.9);
        --glass-border: rgba(255, 255, 255, 0.8);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .parallax-bg {
        display: none;
    }
}

/* Focus styles for accessibility */
.glass-button:focus,
.mode-btn:focus,
.character-option:focus,
.tab-btn:focus {
    outline: 2px solid #00ffff;
    outline-offset: 2px;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: var(--accent-gradient);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

/* Game Rules Styling */
.game-rules {
    margin: var(--space-md) 0;
}

.rule-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin: var(--space-xs) 0;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.rule-icon {
    font-size: 1.2rem;
    min-width: 1.5rem;
}

.rule-text {
    font-size: 0.75rem;
    line-height: 1.2;
}

.rule-text strong {
    color: var(--accent-color, #4facfe);
    font-weight: 600;
}