:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    --shadow: rgba(0, 0, 0, 0.25);
    
    /* Enhanced Colors */
    --glow-primary: rgba(59, 130, 246, 0.5);
    --glow-secondary: rgba(16, 185, 129, 0.5);
    --glow-accent: rgba(245, 158, 11, 0.5);
    --card-gradient: linear-gradient(145deg, rgba(51, 65, 85, 0.8), rgba(30, 41, 59, 0.9));
    --button-gradient: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    --success-gradient: linear-gradient(135deg, var(--success-color), #059669);
    --accent-gradient: linear-gradient(135deg, var(--accent-color), #d97706);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* Enhanced Light Theme Colors */
    --glow-primary: rgba(59, 130, 246, 0.2);
    --glow-secondary: rgba(16, 185, 129, 0.2);
    --glow-accent: rgba(245, 158, 11, 0.2);
    --card-gradient: linear-gradient(145deg, #ffffff, #f1f5f9);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    transition: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
    background-attachment: fixed;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    background: var(--button-gradient);
    color: white;
    border: none;
    border-radius: 50%;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    box-shadow: 0 4px 15px var(--shadow), 0 0 15px var(--glow-primary);
    overflow: hidden;
}

.theme-toggle:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px var(--shadow), 0 0 20px var(--glow-primary);
}

/* Icon Animation */
.theme-toggle i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle:hover i {
    transform: rotate(360deg) scale(1.2);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem 0;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo i {
    font-size: 2.5rem;
    color: var(--primary-color);
    filter: drop-shadow(0 0 10px var(--glow-primary));
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    animation: float 3s ease-in-out infinite;
}

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

.logo:hover i {
    transform: scale(1.2) rotate(5deg);
    color: var(--accent-color);
    filter: drop-shadow(0 0 15px var(--glow-accent));
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.logo:hover h1 {
    letter-spacing: 0.5px;
    filter: brightness(1.2);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    position: relative;
    opacity: 0.9;
    transition: all 0.3s ease;
}

.header:hover .subtitle {
    opacity: 1;
    transform: translateY(2px);
}

/* Menu Container */
.menu-container {
    animation: fadeInUp 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

.menu-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
}

.menu-container h2::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 10px;
    transition: width 0.3s ease;
}

.menu-container h2:hover::after {
    width: 100px;
}

/* Icon Animation for h2 icons */
.menu-container h2 i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.menu-container h2:hover i {
    transform: scale(1.2) rotate(10deg);
    color: var(--primary-color);
}

.subjects-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.subject-category {
    background: var(--card-gradient);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 24px var(--shadow);
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(5px);
}

.subject-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.subject-category:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px var(--shadow), 0 0 15px var(--glow-primary);
}

.subject-category:hover::before {
    opacity: 1;
}

.subject-category h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.2rem;
    position: relative;
    z-index: 1;
}

/* Icon Animation */
.subject-category h3 i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    color: var(--primary-color);
}

.subject-category:hover h3 i {
    transform: scale(1.2) rotate(10deg);
    color: var(--accent-color);
}

/* Subject Buttons */
.btn-container {
    display: grid;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.subject-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border: 2px solid transparent;
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    text-align: left;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.subject-btn::before {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

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

.subject-btn i {
    font-size: 1.2rem;
    min-width: 20px;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.subject-btn:hover i {
    transform: scale(1.2) rotate(10deg);
}

.subject-btn.wajib:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateX(8px);
    box-shadow: 0 5px 15px var(--glow-primary);
}

.subject-btn.kejuruan:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateX(8px);
    box-shadow: 0 5px 15px var(--glow-secondary);
}

.subject-btn.lainnya:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateX(8px);
    box-shadow: 0 5px 15px var(--glow-accent);
}

/* Content Container */
.content-container {
    animation: slideInUp 0.6s cubic-bezier(0.25, 1, 0.5, 1);
    max-width: 800px;
    margin: 0 auto;
}

/* Back Button */
.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 1.5rem;
    transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.back-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

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

.back-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
    transform: translateX(-6px);
    box-shadow: 0 4px 12px var(--shadow);
}

.back-btn i {
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.back-btn:hover i {
    transform: translateX(-4px) scale(1.2);
}

/* Progress Section */
.progress-section {
    margin-bottom: 2rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-card);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 0.5rem;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 8px;
    transition: width 1s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 0 8px var(--glow-primary);
    position: relative;
    overflow: hidden;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

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

.progress-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Cards */
.card {
    background: var(--card-gradient);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px var(--shadow);
    overflow: hidden;
    margin-bottom: 1.5rem;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    backdrop-filter: blur(5px);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--shadow), 0 0 15px var(--glow-primary);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    background: linear-gradient(135deg, var(--primary-color)20, transparent);
    position: relative;
    overflow: hidden;
}

.card-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card:hover .card-header::after {
    opacity: 1;
}

.card-header i {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.card:hover .card-header i {
    transform: scale(1.2) rotate(10deg);
    color: var(--accent-color);
    filter: drop-shadow(0 0 5px var(--glow-accent));
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.card:hover .card-header h2 {
    transform: translateX(5px);
}

.card-content {
    padding: 1.5rem;
}

.card-content p {
    line-height: 1.7;
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.card:hover .card-content p {
    color: var(--text-primary);
}

.card-actions {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Quiz Header */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.quiz-header h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
}

.quiz-header h2 i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    color: var(--primary-color);
}

.quiz-header:hover h2 i {
    transform: scale(1.2) rotate(10deg);
    color: var(--accent-color);
}

.quiz-stats {
    display: flex;
    gap: 1.5rem;
}

.stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.stat i {
    color: var(--primary-color);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stat:hover {
    color: var(--text-primary);
}

.stat:hover i {
    transform: scale(1.2) rotate(10deg);
    color: var(--accent-color);
}

/* Question Container */
#question-container {
    padding: 0;
}

.question-text {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.2rem;
    padding: 1.5rem;
    line-height: 1.6;
}

.answers-grid {
    display: grid;
    gap: 0.75rem;
    padding: 0 1.5rem 1.5rem;
}

.answer-btn {
    padding: 1rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    text-align: left;
    font-size: 1rem;
    line-height: 1.4;
    position: relative;
    overflow: hidden;
}

.answer-btn::before {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.answer-btn:hover:not(:disabled)::before {
    left: 100%;
}

.answer-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: var(--primary-color)20;
    transform: translateX(6px);
    box-shadow: 0 4px 12px var(--shadow);
}

.answer-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.answer-btn.correct {
    background: var(--success-color)20;
    border-color: var(--success-color);
    color: var(--success-color);
    box-shadow: 0 0 15px var(--glow-secondary);
    animation: pulseSuccess 2s infinite;
}

@keyframes pulseSuccess {
    0% { box-shadow: 0 0 5px var(--glow-secondary); }
    50% { box-shadow: 0 0 15px var(--glow-secondary); }
    100% { box-shadow: 0 0 5px var(--glow-secondary); }
}

.answer-btn.incorrect {
    background: var(--danger-color)20;
    border-color: var(--danger-color);
    color: var(--danger-color);
    animation: shakeEffect 0.5s;
}

@keyframes shakeEffect {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* Action Buttons */
.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    text-decoration: none;
    min-width: 120px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

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

.action-btn.primary {
    background: var(--button-gradient);
    color: white;
    box-shadow: 0 4px 15px var(--shadow), 0 0 10px var(--glow-primary);
}

.action-btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px var(--shadow), 0 0 15px var(--glow-primary);
}

.action-btn.primary i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.action-btn.primary:hover i {
    transform: scale(1.2) rotate(10deg);
}

.action-btn.secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.action-btn.secondary:hover {
    background: var(--bg-card);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.action-btn.secondary i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.action-btn.secondary:hover i {
    transform: scale(1.2) rotate(10deg);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.modal-content {
    background: var(--card-gradient);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px var(--shadow), 0 0 20px var(--glow-primary);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scaleIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
}

.modal-header h2 i {
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    color: var(--primary-color);
}

.modal-header:hover h2 i {
    transform: scale(1.2) rotate(10deg);
    color: var(--accent-color);
}

.modal-body {
    padding: 1.5rem;
}

.result-stats {
    display: grid;
    gap: 1rem;
}

.result-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.result-item:hover {
    transform: translateX(5px);
    background: var(--bg-secondary);
    box-shadow: 0 4px 12px var(--shadow);
}

.result-item i {
    font-size: 1.2rem;
    color: var(--primary-color);
    min-width: 20px;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.result-item:hover i {
    transform: scale(1.2) rotate(10deg);
    color: var(--accent-color);
}

.modal-actions {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    width: 100%;
    position: bottom;
    bottom: 0;
    left: 0;
    background: var(--bg-secondary);
    transition: all 0.3s ease;
}

.footer:hover {
    color: var(--text-primary);
}

.footer i {
    color: var(--danger-color);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.footer:hover i {
    transform: scale(1.2) rotate(10deg);
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.credits {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.credits a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

.credits a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -2px;
    left: 0;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.credits a:hover::after {
    width: 100%;
}

/* Quiz Options */
.option-item {
    margin-bottom: 1.5rem;
}

.option-item h3 {
    margin-bottom: 0.5rem;
    font-size: 1rem;
    color: var(--text-primary);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.radio-group label:hover {
    background: var(--bg-secondary);
    transform: translateX(3px);
}

.radio-group input[type="radio"] {
    accent-color: var(--primary-color);
    transition: transform 0.3s ease;
}

.radio-group label:hover input[type="radio"] {
    transform: scale(1.2);
}

/* Selected answer style */
.answer-btn.selected {
    background: var(--primary-color)20;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px var(--glow-primary);
}

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

@keyframes fadeInUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes slideIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes slideInUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Pulse animation for hover effects */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .subject-category {
        padding: 1rem;
    }
    
    .subject-btn {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
    }
    
    .quiz-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .quiz-stats {
        align-self: stretch;
        justify-content: space-between;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .theme-toggle {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1rem 0;
    }
    
    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .question-text {
        font-size: 1.1rem;
        padding: 1rem;
    }
    
    .answers-grid {
        padding: 0 1rem 1rem;
    }
    
    .answer-btn {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
    }
}

/* Prevent text selection for questions */
.question-text, 
.question-text-main, 
.answer-btn,
#question,
#question-container,
#isi-materi {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* Add visual noise layer with reduced opacity */
.noise-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 99;
    opacity: 0.02;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

[data-theme="light"] .noise-layer {
    opacity: 0.02;
}