/* Base Styles and Variables */
:root {
    /* Cyberpunk-inspired Colors */
    --primary-color: #4deeea; /* Cyan: kept for accents, not backgrounds */
    --primary-light: #74f9f6;
    --primary-dark: #1e2e3d; /* Changed to dark blue-gray */
    --secondary-color: #f43f5e; /* Hot pink */
    --tertiary-color: #ffd319; /* Neon yellow */
    --background-color: #0a0a0a; /* Near black */
    --surface-color: #1a1a1a; /* Dark gray */
    --overlay-color: rgba(30, 46, 61, 0.15); /* Dark blue-gray tint */
    --text-primary: #f5f5f5;
    --text-secondary: #c5c5c5;
    --text-hint: #8a8a8a;
    --error-color: #ff2965; /* Brighter red */
    --success-color: #10c4a0;
    --warning-color: #ffd319; /* Neon yellow */
    --primary-rgb: 77, 238, 234; /* RGB values for primary color */
    --secondary-rgb: 244, 63, 94; /* RGB values for secondary color */
    --glow-color: #4deeea;

    /* Dark Theme Colors (default) */
    --dark-background: #0a0a0a;
    --dark-surface: #1a1a1a;
    --dark-overlay: #252525;
    --dark-text-primary: #f5f5f5;
    --dark-text-secondary: #c5c5c5;

    /* Light Theme Colors (optional) */
    --light-background: #f9fafb;
    --light-surface: #ffffff;
    --light-text-primary: #1f2937;
    --light-text-secondary: #4b5563;
    --light-text-hint: #9ca3af;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Animation Definitions */
    --animation-pulse: pulse 2s infinite;
    --animation-flicker: flicker 3s infinite;
    --animation-float: float 3s ease-in-out infinite;
    --animation-glitch: glitch 2.5s infinite;

    /* Fonts */
    --font-family: 'Rajdhani', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;

    /* Border Radius - cyberpunk style with asymmetrical rounded edges */
    --border-radius-sm: 4px 8px 4px 8px;
    --border-radius-md: 8px 12px 8px 12px;
    --border-radius-lg: 12px 16px 12px 16px;
    --border-radius-circle: 50%;
    --border-radius-blade: 0 8px 0 8px;
    --border-radius-cut: 12px 0 12px 0;

    /* Transitions */
    --transition-speed: 0.3s;
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.27, 1.55);
    
    /* Shadows */
    --shadow-neon: 0 0 10px rgba(77, 238, 234, 0.4), 0 0 20px rgba(77, 238, 234, 0.2), 0 0 30px rgba(77, 238, 234, 0.1);
    --shadow-neon-secondary: 0 0 10px rgba(244, 63, 94, 0.4), 0 0 20px rgba(244, 63, 94, 0.2), 0 0 30px rgba(244, 63, 94, 0.1);
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.8);

    /* Grid Lines */
    --grid-line-color: rgba(77, 238, 234, 0.05);
    --grid-size: 25px;
}

/* Import Cyberpunk Fonts */
@import url('https://fonts.googleapis.com/css2?family=Rajdhani:wght@300;400;500;600;700&display=swap');

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

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

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-image: 
        linear-gradient(var(--grid-line-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line-color) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: var(--font-size-xxl);
}

h2 {
    font-size: var(--font-size-xl);
}

h3 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--primary-light);
}

button {
    cursor: pointer;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    transition: all var(--transition-speed);
    border: none;
    outline: none;
    position: relative; /* Added for the gradient effect positioning */
}

/* Add the top-left gradient blur effect to all interactive buttons */
.primary-btn, .secondary-btn, .warning-btn, .quiz-type-btn, button.mini-btn, 
#start-quiz, #next-question, #finish-quiz, #retry-quiz, #new-quiz, 
#reset-progress, #mark-learned, #test-knowledge {
    position: relative;
    overflow: hidden;
}

.primary-btn:before, .secondary-btn:before, .warning-btn:before, .quiz-type-btn:before, 
button.mini-btn:before, #start-quiz:before, #next-question:before, #finish-quiz:before, 
#retry-quiz:before, #new-quiz:before, #reset-progress:before, #mark-learned:before, 
#test-knowledge:before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 40%;
    height: 40%;
    background: radial-gradient(circle at top right, rgba(77, 238, 234, 0.4), transparent 70%);
    z-index: 1;
    pointer-events: none;
    filter: blur(5px);
    opacity: 0.8;
}

ul, ol {
    list-style-position: inside;
    margin-bottom: var(--spacing-md);
}

/* App Container */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100%;
    margin: 0 auto;
}

/* Header Styles */
header {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    background-color: rgba(0, 0, 0, 0.85);
    color: var(--primary-color);
    box-shadow: 0 2px 15px rgba(77, 238, 234, 0.15);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--primary-color);
    backdrop-filter: blur(10px);
    transition: all var(--transition-speed);
}

header h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    text-shadow: 0 0 5px var(--primary-color);
    animation: glow 1.5s ease-in-out infinite alternate;
    margin: 0 auto;
}

.nav-controls {
    position: absolute;
    left: var(--spacing-md);
}

/* Hide menu toggle by default on mobile */
body.is-mobile .nav-controls {
    display: none;
}

/* iOS-specific styles - completely hide menu */
body.is-ios .nav-controls,
body.is-ios #menu-toggle,
body.is-ios .menu-button,
body.is-ios #main-nav {
    display: none !important;
    width: 0 !important;
    height: 0 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    position: absolute !important;
    left: -9999px !important;
    right: auto !important;
    z-index: -9999 !important;
}

body.is-ios #main-nav {
    transform: translateX(-9999px) !important;
}

@keyframes glow {
    from {
        text-shadow: 0 0 5px var(--primary-color), 0 0 10px var(--primary-color);
    }
    to {
        text-shadow: 0 0 10px var(--primary-color), 0 0 20px var(--primary-color), 0 0 30px var(--primary-light);
    }
}

.nav-controls button {
    background: none;
    color: var(--primary-color);
    border: none;
    font-size: 1.25rem;
    padding: var(--spacing-sm);
    transition: transform 0.3s, color 0.3s;
}

.nav-controls button:hover {
    color: var(--primary-light);
    transform: scale(1.1);
}

/* Navigation */
#main-nav {
    background-color: rgba(26, 26, 26, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
    position: fixed;
    top: 60px;
    left: 0;
    height: calc(100vh - 60px);
    width: 250px;
    z-index: 99;
    transform: translateX(-100%);
    transition: transform var(--transition-speed);
    border-right: 1px solid rgba(77, 238, 234, 0.15);
}

#main-nav.active {
    transform: translateX(0);
}

#main-nav ul {
    list-style: none;
    padding: var(--spacing-md);
    margin: 0;
}

#main-nav li {
    margin-bottom: var(--spacing-sm);
}

.nav-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-primary);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
}

.nav-btn:hover {
    background-color: rgba(30, 46, 61, 0.3);
}

.nav-btn.active {
    background-color: var(--primary-dark);
    color: var(--primary-color);
    text-shadow: 0 0 5px var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

/* Main Content */
main {
    flex: 1;
    padding: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
}

/* Screen Styles */
.screen {
    display: none;
    animation: fadeIn var(--transition-speed);
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Home Screen */
.welcome-box {
    background-color: rgba(26, 26, 26, 0.8);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--primary-color);
}

.welcome-box::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    width: calc(100% + 4px);
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    animation: animateTop 2s linear infinite;
}

@keyframes animateTop {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.welcome-box h2 {
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
    animation: glitch 3s infinite;
}

.stats-summary {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl); /* Add more top margin */
    margin-bottom: var(--spacing-lg);
    gap: var(--spacing-md);
}

.stat-card {
    flex: 1;
    min-width: 100px;
    background-color: rgba(26, 26, 26, 0.8);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-md);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(77, 238, 234, 0.3);
    transition: all 0.3s var(--transition-bounce);
    animation: float 6s ease-in-out infinite;
    animation-delay: calc(var(--animation-delay, 0s) + 0.2s);
    margin-bottom: var(--spacing-sm); /* Ensure consistent bottom margin */
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-neon);
    border-color: var(--primary-color);
}

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 0 5px var(--primary-color);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: center; /* Center align the buttons */
    max-width: 400px; /* Limit max width of button container */
    margin-left: auto;
    margin-right: auto;
}

.primary-btn {
    background-color: var(--dark-surface);
    color: var(--primary-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-blade);
    border: 2px solid var(--primary-color);
    border-left: 4px solid var(--primary-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow-sm), 0 0 10px rgba(77, 238, 234, 0.3);
    transition: all 0.3s var(--transition-bounce);
    position: relative;
    overflow: hidden;
    z-index: 1;
    width: 100%; /* Make buttons full width in their container */
    max-width: 300px; /* Limit maximum width */
    clip-path: polygon(
        0 0, 
        calc(100% - 10px) 0, 
        100% 10px, 
        100% 100%, 
        10px 100%, 
        0 calc(100% - 10px)
    );
}

.primary-btn:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(77, 238, 234, 0.2), transparent);
    transition: 0.5s;
    z-index: -1;
}

.primary-btn:hover {
    color: white;
    box-shadow: 0 0 20px rgba(77, 238, 234, 0.6);
    transform: translateY(-3px);
    text-shadow: 0 0 5px var(--primary-color);
}

.primary-btn:hover:before {
    left: 100%;
}

.primary-btn:active {
    transform: translateY(1px);
}

.secondary-btn {
    background-color: rgba(26, 26, 26, 0.8);
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    border-right: 3px solid var(--secondary-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-cut);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    width: 100%; /* Make buttons full width in their container */
    max-width: 300px; /* Limit maximum width */
    clip-path: polygon(
        10px 0, 
        100% 0, 
        100% calc(100% - 10px), 
        calc(100% - 10px) 100%, 
        0 100%, 
        0 10px
    );
}

.secondary-btn:hover {
    background-color: rgba(244, 63, 94, 0.1);
    box-shadow: 0 0 15px rgba(244, 63, 94, 0.4);
    transform: translateY(-2px);
}

.secondary-btn:active {
    transform: translateY(1px);
}

.warning-btn {
    background-color: rgba(0, 0, 0, 0.5);
    color: var(--error-color);
    border: 1px solid var(--error-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    text-transform: uppercase;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.warning-btn::after {
    content: '';
    position: absolute;
    right: -2px;
    top: -2px;
    width: calc(50% + 4px);
    height: 4px;
    background: var(--error-color);
}

.warning-btn::before {
    content: '';
    position: absolute;
    left: -2px;
    bottom: -2px;
    width: calc(50% + 4px);
    height: 4px;
    background: var(--error-color);
}

.warning-btn:hover {
    background-color: rgba(255, 41, 101, 0.15);
    box-shadow: 0 0 15px rgba(255, 41, 101, 0.4);
    transform: translateY(-2px);
}

.featured-model {
    background-color: rgba(26, 26, 26, 0.8);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.featured-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
}

.featured-model::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
    opacity: 0.1;
    pointer-events: none;
}

.featured-model h3 {
    color: var(--tertiary-color);
    margin-bottom: var(--spacing-md);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    padding-bottom: 10px;
    animation: flicker 5s linear infinite;
    display: flex;
    align-items: center;
    gap: 10px;
}

.featured-model h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--tertiary-color), transparent);
}

.refresh-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 1rem;
    cursor: pointer;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    background-color: rgba(30, 46, 61, 0.3);
    border: 1px solid rgba(77, 238, 234, 0.2);
}

.refresh-btn:hover {
    transform: rotate(180deg);
    background-color: rgba(77, 238, 234, 0.1);
    box-shadow: 0 0 10px rgba(77, 238, 234, 0.3);
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.refresh-btn.rotating {
    animation: rotate 0.5s linear;
}

.model-quick-info {
    margin-top: var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 576px) {
    .model-quick-info {
        grid-template-columns: 1fr 1fr;
    }
}

.quick-info-item {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm);
    border-left: 2px solid var(--primary-color);
}

.quick-info-item h5 {
    color: var(--primary-color);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.quick-info-item p {
    font-size: 0.85rem;
    line-height: 1.4;
    margin-bottom: 0;
    color: var(--text-secondary);
}

.mini-btn {
    font-size: 0.85rem;
    padding: 6px 10px;
    margin-top: var(--spacing-md);
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.model-card {
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-lg);
    background-color: rgba(0, 0, 0, 0.3);
    border-left: 2px solid var(--primary-color);
    margin-top: var(--spacing-md);
    position: relative;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s;
}

.model-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-neon);
    border-color: var(--primary-color);
}

/* Models Library Screen */
.search-filter {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

#search-models, #filter-category {
    flex: 1;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-blade);
    border: 1px solid var(--text-hint);
    min-width: 150px;
    background-color: rgba(0, 0, 0, 0.5);
    color: var(--text-primary);
    transition: all 0.3s;
    position: relative;
    outline: none;
    backdrop-filter: blur(3px);
}

#search-models:focus, #filter-category:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(77, 238, 234, 0.4);
}

#search-models {
    padding-left: 30px;
}

#search-models::placeholder {
    color: var(--text-hint);
}

.search-filter {
    position: relative;
}

.search-filter::before {
    content: '\f002';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: 14px;
    z-index: 1;
}

.library-actions {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.library-actions button {
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
}

.library-actions button:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 15px rgba(77, 238, 234, 0.5);
}

.library-actions button i {
    margin-right: 8px;
    animation: pulse 2s infinite;
}

.models-progress {
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    height: 10px;
    background-color: #e0e0e0;
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

#models-progress-fill {
    height: 100%;
    background-color: var(--success-color);
    width: 0%;
    transition: width var(--transition-speed);
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* Ensure 3 cards per row at reasonable sizes */
@media (min-width: 768px) {
    .models-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.model-item {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-speed);
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.model-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: rgba(77, 238, 234, 0.3);
}

.model-item.learned {
    border-left: 4px solid var(--success-color);
}

.model-item.learned::after {
    content: "✓";
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--success-color);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.model-item h4 {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-xs);
}

.category-tag {
    display: inline-block;
    background-color: rgba(30, 46, 61, 0.2);
    color: var(--primary-color);
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    border: 1px solid rgba(77, 238, 234, 0.2);
}

/* Model Detail Screen */
.back-button {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

#model-detail-content {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border-top: 3px solid var(--primary-color);
}

.model-description, .model-example, .model-application {
    margin-bottom: var(--spacing-lg);
}

.model-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* Audio Controls */
.audio-controls {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 100;
}

.audio-btn {
    width: 50px;
    height: 50px;
    background-color: var(--primary-dark);
    color: white;
    border: 2px solid rgba(77, 238, 234, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.audio-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg, 
        transparent, 
        rgba(77, 238, 234, 0.2), 
        transparent
    );
    transition: 0.5s;
    z-index: -1;
}

.audio-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-neon);
    border-color: var(--primary-color);
}

.audio-btn:hover::before {
    left: 100%;
}

.audio-btn:active {
    transform: scale(0.95);
}

.active-audio {
    background-color: rgba(26, 26, 26, 0.9);
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color), 
                0 0 20px rgba(77, 238, 234, 0.5);
    animation: pulse 2s infinite;
}

.audio-tooltip {
    position: absolute;
    background-color: rgba(30, 46, 61, 0.8);
    color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
    right: 60px;
    top: 15px;
    white-space: nowrap;
    opacity: 0.7;
    transition: opacity 0.3s;
    border: 1px solid rgba(77, 238, 234, 0.3);
    pointer-events: none;
    text-shadow: 0 0 5px rgba(77, 238, 234, 0.5);
    animation: pulse 2s infinite, fadeOut 1s ease 5s forwards;
}

/* Mobile-specific tooltip */
body.is-mobile .audio-tooltip {
    bottom: 60px;
    top: auto;
    right: 10px;
    animation: pulse 2s infinite, mobileFadeOut 1s ease 4s forwards;
    background-color: rgba(20, 30, 40, 0.95);
    padding: 8px 12px;
    font-size: 14px;
    border-width: 2px;
}

body.is-mobile .audio-tooltip:after {
    top: auto;
    bottom: -10px;
    right: 15px;
    transform: rotate(90deg);
    border-color: transparent transparent transparent rgba(20, 30, 40, 0.95);
}

@keyframes fadeOut {
    from { opacity: 0.7; }
    to { opacity: 0; visibility: hidden; }
}

@keyframes mobileFadeOut {
    0% { opacity: 0.9; transform: translateY(0); }
    100% { opacity: 0; visibility: hidden; transform: translateY(-10px); }
}

.audio-tooltip:after {
    content: '';
    position: absolute;
    top: 50%;
    right: -10px;
    margin-top: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: transparent transparent transparent rgba(30, 46, 61, 0.8);
}

.audio-controls:hover .audio-tooltip {
    opacity: 1;
    visibility: visible;
    animation: none; /* Stop the fadeOut animation on hover */
}

.active-audio i {
    text-shadow: 0 0 5px var(--primary-color);
}

/* Quiz Game Screen */
#quiz-type-selector {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.quiz-type-btn {
    background-color: rgba(30, 46, 61, 0.2);
    color: var(--text-primary);
    border: 1px solid var(--text-hint);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-blade);
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
    font-weight: 600;
    letter-spacing: 1px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.5);
    text-transform: uppercase;
    clip-path: polygon(
        0 0, 
        calc(100% - 10px) 0, 
        100% 10px, 
        100% 100%, 
        10px 100%, 
        0 calc(100% - 10px)
    );
}

.quiz-type-btn:hover {
    background-color: rgba(77, 238, 234, 0.1);
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(77, 238, 234, 0.2);
    transform: translateY(-2px);
}

.quiz-type-btn.active {
    background-color: rgba(30, 46, 61, 0.8);
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(77, 238, 234, 0.3);
    text-shadow: 0 0 5px var(--primary-color);
}

#quiz-settings {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.setting-group label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.setting-group select, 
select[id], /* Target all select elements with ID attributes */
input[type="text"],
input[type="number"],
input[type="password"] {
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-cut);
    border: 1px solid var(--text-hint);
    background-color: rgba(0, 0, 0, 0.5);
    color: var(--text-primary);
    position: relative;
    transition: all 0.3s;
    outline: none;
    appearance: none;
    padding-right: 25px;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%234deeea' viewBox='0 0 16 16'><path d='M7.646 4.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1-.708.708L8 5.707l-5.646 5.647a.5.5 0 0 1-.708-.708l6-6z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 8px center;
    cursor: pointer;
}

.setting-group select:focus,
select[id]:focus,
input[type="text"]:focus,
input[type="number"]:focus,
input[type="password"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(77, 238, 234, 0.4);
}

#start-quiz {
    display: block;
    margin: 0 auto;
    margin-bottom: var(--spacing-lg);
}

#quiz-container {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
    border-top: 3px solid var(--primary-color);
}

.quiz-progress {
    margin-bottom: var(--spacing-md);
}

.progress-text {
    text-align: center;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

#quiz-progress-fill {
    height: 100%;
    background-color: var(--primary-dark);
    border-right: 2px solid var(--primary-color);
    width: 0%;
    transition: width var(--transition-speed);
    position: relative;
    overflow: hidden;
}

#quiz-progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(77, 238, 234, 0.4), 
        transparent
    );
    animation: progressShine 1.5s linear infinite;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

#question-container {
    margin-bottom: var(--spacing-lg);
}

#answer-options {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.answer-option {
    background-color: var(--background-color);
    border: 1px solid var(--text-hint);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.answer-option:hover {
    background-color: rgba(30, 46, 61, 0.3);
    border-color: var(--primary-color);
}

.answer-option.selected {
    background-color: rgba(30, 46, 61, 0.5);
    border-color: var(--primary-color);
}

.answer-option.correct {
    background-color: rgba(76, 175, 80, 0.1);
    border-color: var(--success-color);
}

.answer-option.incorrect {
    background-color: rgba(176, 0, 32, 0.1);
    border-color: var(--error-color);
}

#quiz-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

#quiz-results {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    border-top: 3px solid var(--primary-color);
}

.result-score {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.result-percentage {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.result-message {
    margin-bottom: var(--spacing-lg);
}

.result-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

#result-review {
    text-align: left;
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--text-hint);
    padding-top: var(--spacing-lg);
}

.review-item {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.review-question {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.review-answer {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.review-answer.correct {
    color: var(--success-color);
}

.review-answer.incorrect {
    color: var(--error-color);
}

/* Progress Screen */
.progress-summary {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    border-top: 3px solid var(--primary-color);
}

.overall-progress {
    flex: 1;
    min-width: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.circular-progress {
    position: relative;
    width: 120px;
    height: 120px;
    margin: var(--spacing-md) auto;
}

.progress-percentage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--success-color);
}

#progress-circle {
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    transition: stroke-dashoffset 0.5s;
}

.stats-container {
    flex: 2;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

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

.stat-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.category-progress {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border-left: 3px solid var(--secondary-color);
}

.category-bar {
    margin-bottom: var(--spacing-md);
}

.category-name {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.category-name span:first-child {
    font-weight: 600;
}

.recent-activity {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border-left: 3px solid var(--secondary-color);
}

.activity-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(30, 46, 61, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
    color: var(--primary-color);
    border: 1px solid rgba(77, 238, 234, 0.2);
}

.activity-content {
    flex: 1;
}

.activity-title {
    font-weight: 600;
}

.activity-time {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.progress-controls {
    display: flex;
    justify-content: center;
}

/* Settings Screen */
.settings-group {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border-top: 3px solid var(--primary-color);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.setting-item:last-child {
    border-bottom: none;
}

.toggle-switch {
    position: relative;
    width: 60px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 26, 26, 0.7);
    border-radius: 4px;
    transition: var(--transition-speed);
    overflow: hidden;
    border: 1px solid rgba(77, 77, 77, 0.5);
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.5);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 3px;
    background-color: var(--text-secondary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    z-index: 2;
}

.toggle-slider:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(77, 238, 234, 0.1), transparent);
    transition: 0.5s;
    z-index: 1;
}

input:checked + .toggle-slider {
    background-color: rgba(26, 26, 26, 0.7);
    border-color: var(--primary-color);
}

input:checked + .toggle-slider:before {
    transform: translateX(33px);
    background-color: var(--primary-dark);
    border: 1px solid var(--primary-color);
    box-shadow: 0 0 8px rgba(77, 238, 234, 0.5);
}

input:checked + .toggle-slider:after {
    left: 100%;
}

.toggle-switch:hover .toggle-slider {
    box-shadow: 0 0 5px rgba(77, 238, 234, 0.2);
}

/* Footer */
footer {
    background-color: rgba(26, 26, 26, 0.9);
    color: var(--text-secondary);
    padding: var(--spacing-md);
    text-align: center;
    margin-top: auto;
    border-top: 1px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 200%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    animation: footerGlow 4s linear infinite;
}

@keyframes footerGlow {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* New Cyberpunk Animations */
@keyframes pulse {
    0% {
        opacity: 1;
        box-shadow: var(--shadow-neon);
    }
    50% {
        opacity: 0.7;
        box-shadow: 0 0 5px rgba(77, 238, 234, 0.3);
    }
    100% {
        opacity: 1;
        box-shadow: var(--shadow-neon);
    }
}

@keyframes flicker {
    0%, 19.999%, 22%, 62.999%, 64%, 64.999%, 70%, 100% {
        opacity: 1;
        text-shadow: 0 0 4px var(--primary-color), 0 0 11px var(--primary-color), 0 0 19px var(--primary-color);
    }
    20%, 21.999%, 63%, 63.999%, 65%, 69.999% {
        opacity: 0.4;
        text-shadow: none;
    }
}

@keyframes glitch {
    0% {
        text-shadow: 0.05em 0 0 rgba(255, 0, 0, 0.75), -0.05em -0.025em 0 rgba(0, 255, 0, 0.75), -0.025em 0.05em 0 rgba(0, 0, 255, 0.75);
    }
    14% {
        text-shadow: 0.05em 0 0 rgba(255, 0, 0, 0.75), -0.05em -0.025em 0 rgba(0, 255, 0, 0.75), -0.025em 0.05em 0 rgba(0, 0, 255, 0.75);
    }
    15% {
        text-shadow: -0.05em -0.025em 0 rgba(255, 0, 0, 0.75), 0.025em 0.025em 0 rgba(0, 255, 0, 0.75), -0.05em -0.05em 0 rgba(0, 0, 255, 0.75);
    }
    49% {
        text-shadow: -0.05em -0.025em 0 rgba(255, 0, 0, 0.75), 0.025em 0.025em 0 rgba(0, 255, 0, 0.75), -0.05em -0.05em 0 rgba(0, 0, 255, 0.75);
    }
    50% {
        text-shadow: 0.025em 0.05em 0 rgba(255, 0, 0, 0.75), 0.05em 0 0 rgba(0, 255, 0, 0.75), 0 -0.05em 0 rgba(0, 0, 255, 0.75);
    }
    99% {
        text-shadow: 0.025em 0.05em 0 rgba(255, 0, 0, 0.75), 0.05em 0 0 rgba(0, 255, 0, 0.75), 0 -0.05em 0 rgba(0, 0, 255, 0.75);
    }
    100% {
        text-shadow: -0.025em 0 0 rgba(255, 0, 0, 0.75), -0.025em -0.025em 0 rgba(0, 255, 0, 0.75), -0.025em -0.05em 0 rgba(0, 0, 255, 0.75);
    }
}

@keyframes float {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0);
    }
}

@keyframes scanline {
    0% {
        transform: translateY(-100%);
    }
    100% {
        transform: translateY(100%);
    }
}

@keyframes neon-border {
    0%, 100% {
        border-color: var(--primary-color);
        box-shadow: 0 0 5px var(--primary-color), 
                    inset 0 0 5px var(--primary-color);
    }
    50% {
        border-color: rgba(77, 238, 234, 0.5);
        box-shadow: 0 0 20px var(--primary-color), 
                    inset 0 0 10px var(--primary-color);
    }
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

/* Cyberpunk UI enhancement classes */
.scanline {
    position: relative;
    overflow: hidden;
}

.scanline::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: rgba(77, 238, 234, 0.3);
    opacity: 0.75;
    animation: scanline 2s linear infinite;
    pointer-events: none;
}

.terminal-text {
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
    white-space: nowrap;
    overflow: hidden;
    border-right: 0.15em solid var(--primary-color);
    letter-spacing: 0.15em;
    animation: typing 3.5s steps(30, end), blink-caret 0.75s step-end infinite;
}

.neon-border {
    border: 1px solid var(--primary-color);
    animation: neon-border 2s infinite;
}

.retro-shadow {
    text-shadow: 2px 2px 0px var(--secondary-color),
                4px 4px 0px rgba(255, 56, 100, 0.4);
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--primary-color) }
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed);
}

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

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.3), 0 4px 20px rgba(0, 0, 0, 0.2);
    position: relative;
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    /* Removed animation */
}

@keyframes glow {
    from {
        box-shadow: 0 0 5px rgba(var(--primary-rgb), 0.3), 0 4px 20px rgba(0, 0, 0, 0.2);
    }
    to {
        box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.5), 0 4px 20px rgba(0, 0, 0, 0.2);
    }
}

.close-modal {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* Flashcard Styles */
.flashcard-content {
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-md);
    background-color: rgba(0, 71, 171, 0.2);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(77, 238, 234, 0.5);
    transition: all 0.3s ease;
}

.flashcard-front, .flashcard-back {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    background: linear-gradient(145deg, rgba(0, 71, 171, 0.1) 0%, rgba(77, 238, 234, 0.2) 100%);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    position: relative;
    overflow: hidden;
}

.flashcard-front::after, .flashcard-back::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(77, 238, 234, 0.1), transparent);
    /* Removed animation */
    pointer-events: none;
}

.flashcard-instruction {
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 1rem;
    font-size: 0.9rem;
    /* Removed animation */
}

.model-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    text-shadow: 0 0 5px rgba(var(--primary-rgb), 0.5);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* Dark Theme */
.dark-theme {
    --background-color: var(--dark-background);
    --surface-color: var(--dark-surface);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
}

/* Responsive Design */
@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
    
    main {
        max-width: 800px;
        margin: 0 auto;
        padding: var(--spacing-lg);
    }

    .action-buttons {
        flex-direction: row;
    }

    .setting-item {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .model-detail-content {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 767px) {
    html {
        font-size: 14px;
    }
    
    body {
        background-size: 20px 20px; /* Smaller grid pattern on mobile */
    }
    
    header h1 {
        font-size: 1.25rem;
    }
    
    header {
        padding: var(--spacing-sm);
    }
    
    .nav-controls {
        left: var(--spacing-xs);
    }
    
    #main-nav {
        width: 85%; /* Wider side menu on mobile */
        backdrop-filter: blur(10px); /* Stronger blur effect */
    }
    
    main {
        padding: var(--spacing-sm);
    }
    
    .welcome-box, .featured-model, .progress-summary, .category-progress, 
    #quiz-container, #quiz-results, .settings-group {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    
    .stats-summary {
        flex-direction: column;
    }

    .stat-card {
        margin-bottom: var(--spacing-sm);
        min-width: 100%;
    }
    
    .featured-model h3 {
        font-size: 1.2rem;
    }
    
    .primary-btn, .secondary-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
    
    /* Improve touch targets */
    button, .nav-btn, .model-item, .answer-option {
        min-height: 44px; /* Apple recommendation for touch targets */
    }

    #quiz-type-selector {
        flex-direction: column;
    }
    
    #quiz-settings {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        max-height: 80vh;
        overflow-y: auto;
    }

    .models-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }
    
    /* Optimize for touch scrolling */
    .screen {
        -webkit-overflow-scrolling: touch;
    }
    
    /* Adjust audio controls for mobile */
    .audio-controls {
        bottom: 20px;
        right: 20px;
    }
    
    .audio-tooltip {
        width: 120px;
        right: 40px;
    }
}

/* Font Size Settings */
body.font-small {
    font-size: 14px;
}

body.font-medium {
    font-size: 16px;
}

body.font-large {
    font-size: 18px;
}

/* Mobile-Specific Classes */
body.is-mobile .primary-btn,
body.is-mobile .secondary-btn {
    padding: var(--spacing-sm) var(--spacing-md);
}

body.is-mobile .featured-model,
body.is-mobile .welcome-box,
body.is-mobile .progress-summary {
    padding: var(--spacing-md);
}

body.is-mobile .stat-card {
    margin-bottom: var(--spacing-sm);
}

body.is-mobile.portrait .stats-summary {
    flex-direction: column;
}

body.is-mobile.landscape .stats-summary {
    flex-direction: row;
}

body.is-mobile.portrait .model-detail-content {
    display: block;
}

body.is-mobile.landscape .model-detail-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
}

body.is-mobile .audio-controls {
    transform: scale(1.2);
}

body.is-mobile .models-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
}

body.is-mobile.portrait #quiz-type-selector {
    flex-direction: column;
}

body.is-mobile.landscape #quiz-type-selector {
    flex-direction: row;
}

body.is-mobile .setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
}

/* Touch-friendly overrides */
body.is-mobile button:not(.mini-btn):not(.refresh-btn),
body.is-mobile .nav-btn, 
body.is-mobile .model-item,
body.is-mobile .answer-option {
    min-height: 44px;
}