/* Reset y configuración base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colores principales */
    --primary-bg: #0a0e27;
    --secondary-bg: #1a1f3a;
    --accent-purple: #8b5cf6;
    --accent-blue: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 100%);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
    
    /* Bordes */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Configuración base del body */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Partículas de fondo */
#particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 20% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
}

#particles-bg::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(139, 92, 246, 0.1) 2px, transparent 2px),
        radial-gradient(circle at 75% 75%, rgba(59, 130, 246, 0.1) 2px, transparent 2px);
    background-size: 50px 50px;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* Contenedor principal */
.quiz-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    position: relative;
}

/* Pantallas */
.screen {
    display: none;
    width: 100%;
    max-width: 600px;
    animation: fadeInUp 0.6s ease-out;
}

.screen.active {
    display: block;
}

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

/* Tarjetas */
.login-card,
.quiz-card,
.results-card {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.login-card::before,
.quiz-card::before,
.results-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

/* Encabezados */
.card-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

/* Formularios */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-group {
    position: relative;
}

.input-group input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--border-radius-lg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-normal);
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: var(--shadow-glow);
}

.input-group label {
    position: absolute;
    left: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    transition: var(--transition-normal);
    pointer-events: none;
}

.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label {
    top: 0;
    left: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--accent-purple);
    background: var(--secondary-bg);
    padding: 0 var(--spacing-sm);
}

/* Botones */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 2px solid rgba(139, 92, 246, 0.3);
}

.btn-secondary:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-purple);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

.btn.loading .btn-loader {
    display: block;
}

.btn.loading .btn-text {
    display: none;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Header del quiz */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
}

.progress-container {
    flex: 1;
    margin: 0 var(--spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--border-radius-sm);
    transition: width var(--transition-normal);
}

.progress-text {
    text-align: center;
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.score-container {
    text-align: center;
    min-width: 80px;
}

.score-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-purple);
}

/* Contenedor de preguntas */
.question-container {
    margin-bottom: var(--spacing-xl);
}

.question-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option-btn {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--border-radius-lg);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.option-btn:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-purple);
    transform: translateY(-2px);
}

.option-btn.selected {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--accent-purple);
    box-shadow: var(--shadow-glow);
}

.option-btn.correct {
    background: rgba(34, 197, 94, 0.2);
    border-color: #22c55e;
}

.option-btn.incorrect {
    background: rgba(239, 68, 68, 0.2);
    border-color: #ef4444;
}

.option-check {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(139, 92, 246, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.option-btn.selected .option-check {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
}

.option-btn.correct .option-check {
    background: #22c55e;
    border-color: #22c55e;
}

.option-btn.incorrect .option-check {
    background: #ef4444;
    border-color: #ef4444;
}

/* Controles del quiz */
.quiz-controls {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* Resultados */
.results-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.score-display {
    margin-bottom: var(--spacing-xl);
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    position: relative;
    box-shadow: var(--shadow-glow);
}

.score-percentage {
    font-size: 2rem;
    font-weight: 700;
    color: white;
}

.score-description {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-purple);
}

.results-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Toast notifications */
#toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--secondary-bg);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--accent-purple);
    animation: slideInRight 0.3s ease-out;
    max-width: 300px;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 480px) {
    .quiz-container {
        padding: var(--spacing-sm);
    }
    
    .login-card,
    .quiz-card,
    .results-card {
        padding: var(--spacing-lg);
    }
    
    .title {
        font-size: 2rem;
    }
    
    .question-title {
        font-size: 1.1rem;
    }
    
    .quiz-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .progress-container {
        margin: 0;
        width: 100%;
    }
    
    .score-circle {
        width: 100px;
        height: 100px;
    }
    
    .score-percentage {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.875rem;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .quiz-container {
        padding: var(--spacing-md);
    }
    
    .login-card,
    .quiz-card,
    .results-card {
        padding: var(--spacing-xl);
    }
    
    .title {
        font-size: 2.25rem;
    }
    
    .question-title {
        font-size: 1.2rem;
    }
    
    .quiz-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .score-circle {
        width: 110px;
        height: 110px;
    }
    
    .score-percentage {
        font-size: 1.75rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .quiz-container {
        padding: var(--spacing-lg);
    }
    
    .login-card,
    .quiz-card,
    .results-card {
        padding: var(--spacing-2xl);
    }
    
    .title {
        font-size: 2.5rem;
    }
    
    .question-title {
        font-size: 1.25rem;
    }
    
    .results-actions {
        flex-direction: row;
        justify-content: center;
    }
}

@media (min-width: 1025px) and (max-width: 1440px) {
    .quiz-container {
        padding: var(--spacing-xl);
    }
    
    .login-card,
    .quiz-card,
    .results-card {
        padding: var(--spacing-2xl);
    }
    
    .title {
        font-size: 2.75rem;
    }
    
    .question-title {
        font-size: 1.3rem;
    }
    
    .options-container {
        gap: var(--spacing-lg);
    }
    
    .option-btn {
        padding: var(--spacing-xl);
    }
}

@media (min-width: 1441px) {
    .quiz-container {
        padding: var(--spacing-2xl);
    }
    
    .login-card,
    .quiz-card,
    .results-card {
        padding: calc(var(--spacing-2xl) * 1.5);
    }
    
    .title {
        font-size: 3rem;
    }
    
    .question-title {
        font-size: 1.4rem;
    }
    
    .options-container {
        gap: var(--spacing-xl);
    }
    
    .option-btn {
        padding: calc(var(--spacing-xl) * 1.2);
    }
    
    .btn {
        padding: calc(var(--spacing-md) * 1.2) calc(var(--spacing-xl) * 1.2);
        font-size: 1.1rem;
    }
}

/* Animaciones de transición */
.fade-out {
    animation: fadeOut 0.3s ease-out forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.95);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Loading */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

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

/* Focus visible para accesibilidad */
.btn:focus-visible,
.option-btn:focus-visible,
.input-group input:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 2px;
}

/* Scrollbar personalizada */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-purple);
    border-radius: var(--border-radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}

/* ===== CLASES CSS PARA QUIZ MODERNO ===== */

/* Contenedor principal del quiz moderno */
.quiz-modern-container {
    min-height: 100vh;
    background: var(--primary-bg);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    padding: var(--spacing-md);
    position: relative;
}

/* Header del quiz moderno */
.quiz-modern-header {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.quiz-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.quiz-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.quiz-logo {
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.quiz-title {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.quiz-stats {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.stat-icon {
    width: 24px;
    height: 24px;
    color: var(--accent-purple);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Barra de progreso moderna */
.quiz-progress-container {
    margin-bottom: var(--spacing-xl);
}

.progress-bar-modern {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--border-radius-sm);
    transition: width var(--transition-normal);
    position: relative;
}

.progress-wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
    0%, 100% { transform: translateX(-100%); }
    50% { transform: translateX(100%); }
}

/* Contenido principal del quiz */
.quiz-main-content {
    background: var(--secondary-bg);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

/* Tarjeta de pregunta */
.question-card {
    margin-bottom: var(--spacing-xl);
}

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

.question-meta {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.question-book,
.question-difficulty {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.question-content {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.question-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
}

/* Contenedor de opciones */
.options-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* Opciones del quiz moderno */
.quiz-option-modern {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.quiz-option-modern:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-purple);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.quiz-option-modern.selected {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--accent-purple);
    box-shadow: var(--shadow-glow);
}

.quiz-option-modern.correct {
    background: rgba(34, 197, 94, 0.2);
    border-color: #22c55e;
}

.quiz-option-modern.incorrect {
    background: rgba(239, 68, 68, 0.2);
    border-color: #ef4444;
}

.option-letter {
    width: 40px;
    height: 40px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.option-text {
    flex: 1;
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Navegación del quiz moderno */
.quiz-navigation-modern {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nav-buttons-row {
    display: flex;
    gap: var(--spacing-md);
    justify-content: space-between;
}

.submit-row {
    display: flex;
    justify-content: center;
}

.nav-btn-modern {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 120px;
    justify-content: center;
}

.nav-btn-modern.primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-btn-modern.primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.nav-btn-modern.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 2px solid rgba(139, 92, 246, 0.3);
}

.nav-btn-modern.secondary:hover:not(:disabled) {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-purple);
}

.nav-btn-modern:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.submit-btn-modern {
    padding: var(--spacing-lg) var(--spacing-2xl);
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
}

.submit-btn-modern:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Completación del quiz moderno */
.quiz-completion-modern {
    text-align: center;
    padding: var(--spacing-2xl);
}

.completion-header {
    margin-bottom: var(--spacing-2xl);
}

.completion-icon {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: 2rem;
    color: white;
    box-shadow: var(--shadow-glow);
}

.completion-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.completion-message {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.completion-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-purple);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.completion-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-modern {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.btn-modern.primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-modern.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-modern.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 2px solid rgba(139, 92, 246, 0.3);
}

.btn-modern.secondary:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-purple);
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 39, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(139, 92, 246, 0.2);
    border-top: 4px solid var(--accent-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

/* Contenedor de AdSense */
.adsense-container {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(139, 92, 246, 0.1);
    text-align: center;
}

/* Responsive para quiz moderno */
@media (max-width: 768px) {
    .quiz-modern-header {
        padding: var(--spacing-lg);
    }
    
    .quiz-header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .quiz-stats {
        width: 100%;
        justify-content: space-between;
    }
    
    .quiz-main-content {
        padding: var(--spacing-lg);
    }
    
    .nav-buttons-row {
        flex-direction: column;
    }
    
    .completion-stats {
        grid-template-columns: 1fr;
    }
    
    .completion-actions {
        flex-direction: column;
        align-items: center;
    }
}