/* ========================================
   FísicaLab - High School Physics Testing Platform
   Spanish Physics Education Website
   ======================================== */

/* CSS Variables */
:root {
    --primary: #FF6B35;
    --primary-dark: #E55A2B;
    --secondary: #2563EB;
    --secondary-dark: #1D4ED8;
    --accent: #10B981;
    --background: #F8FAFC;
    --surface: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --error: #EF4444;
    --success: #22C55E;
    --warning: #F59E0B;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.nav-main {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-main a {
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
    position: relative;
}

.nav-main a:hover,
.nav-main a.active {
    color: var(--primary);
}

.nav-main a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-main a:hover::after,
.nav-main a.active::after {
    width: 100%;
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--surface);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    min-width: 220px;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.dropdown-menu a:hover {
    background: var(--background);
    color: var(--primary);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    font-weight: 800;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto 30px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: white;
}

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

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid white;
}

.btn-secondary:hover {
    background: transparent;
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* ========================================
   Cards
   ======================================== */
.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-image {
    height: 180px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.card-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: 25px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

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

.section-header .btn {
    margin-top: 20px;
}

/* ========================================
   Test Categories
   ======================================== */
.category-nav {
    background: var(--surface);
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.category-list {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.category-btn {
    padding: 10px 20px;
    background: var(--background);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.category-btn:hover,
.category-btn.active {
    background: var(--primary);
    color: white;
}

/* ========================================
   Test Page Styles
   ======================================== */
.test-header {
    background: linear-gradient(135deg, var(--secondary), #1E40AF);
    color: white;
    padding: 40px 0;
}

.test-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.test-timer {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255,255,255,0.2);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 1.2rem;
    font-weight: 600;
}

.test-progress {
    display: flex;
    align-items: center;
    gap: 15px;
}

.progress-bar {
    width: 200px;
    height: 8px;
    background: rgba(255,255,255,0.3);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: white;
    transition: width 0.3s ease;
}

.test-body {
    padding: 40px 0;
}

.question-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: var(--shadow-md);
}

.question-number {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.question-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--text-primary);
}

.question-image {
    max-width: 100%;
    max-height: 300px;
    margin: 15px 0;
    border-radius: var(--radius-md);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.option:hover {
    border-color: var(--primary);
    background: white;
}

.option.selected {
    border-color: var(--primary);
    background: rgba(255, 107, 53, 0.1);
}

.option.correct {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

.option.incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.option-radio {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.option.selected .option-radio {
    border-color: var(--primary);
    background: var(--primary);
}

.option.selected .option-radio::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.option-text {
    flex: 1;
    font-size: 1rem;
}

.explanation {
    margin-top: 20px;
    padding: 20px;
    background: linear-gradient(135deg, #EFF6FF, #F0F9FF);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--secondary);
}

.explanation-title {
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.explanation-text {
    color: var(--text-secondary);
    line-height: 1.7;
}

.test-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

/* ========================================
   Results
   ======================================== */
.results-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.results-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.results-icon.excellent {
    background: linear-gradient(135deg, var(--success), #16A34A);
    color: white;
}

.results-icon.good {
    background: linear-gradient(135deg, var(--warning), #D97706);
    color: white;
}

.results-icon.needs-work {
    background: linear-gradient(135deg, var(--error), #DC2626);
    color: white;
}

.results-score {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.results-label {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-item {
    padding: 20px;
    background: var(--background);
    border-radius: var(--radius-md);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

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

/* ========================================
   Articles
   ======================================== */
.article-card {
    display: flex;
    flex-direction: column;
}

.article-card .card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card .card-text {
    flex: 1;
}

.article-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: auto;
}

.article-tag {
    padding: 4px 12px;
    background: var(--background);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.article-tag.mecanica { background: #FEF3C7; color: #92400E; }
.article-tag.termodinamica { background: #FEE2E2; color: #991B1B; }
.article-tag.electromagnetismo { background: #E0E7FF; color: #3730A3; }
.article-tag.optica { background: #D1FAE5; color: #065F46; }
.article-tag.fisica-moderna { background: #F3E8FF; color: #7C3AED; }
.article-tag.acustica { background: #FECDD3; color: #9F1239; }
.article-tag.fluidos { background: #CFFAFE; color: #0E7490; }

/* Article Page */
.article-header {
    background: linear-gradient(135deg, #1E293B, #334155);
    color: white;
    padding: 60px 0;
}

.article-meta {
    display: flex;
    gap: 20px;
    align-items: center;
    margin-bottom: 15px;
    font-size: 0.95rem;
    opacity: 0.9;
}

.article-content {
    padding: 40px 0;
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
}

.article-body h2 {
    font-size: 1.8rem;
    margin: 35px 0 15px;
    color: var(--text-primary);
}

.article-body h3 {
    font-size: 1.4rem;
    margin: 25px 0 10px;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.article-body ul, .article-body ol {
    margin-bottom: 20px;
    padding-left: 25px;
}

.article-body li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    list-style: disc;
}

.article-body ol li {
    list-style: decimal;
}

.article-body img {
    border-radius: var(--radius-md);
    margin: 25px 0;
}

.article-body blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 20px;
    margin: 25px 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* Related Articles */
.related-articles {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

/* ========================================
   About Page
   ======================================== */
.about-hero {
    background: linear-gradient(135deg, var(--text-primary), #475569);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.about-content {
    padding: 60px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    margin-bottom: 20px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.value-card {
    background: var(--surface);
    padding: 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.value-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.value-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.value-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ========================================
   Contact Page
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-form {
    background: var(--surface);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 25px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.contact-info {
    padding: 20px 0;
}

.contact-info h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--background);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
}

.info-text h4 {
    font-weight: 600;
    margin-bottom: 3px;
}

.info-text p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.95rem;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.social-link {
    width: 45px;
    height: 45px;
    background: var(--background);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: white;
}

/* ========================================
   Legal Pages
   ======================================== */
.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 20px;
}

.legal-content h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.legal-content h2 {
    font-size: 1.5rem;
    margin: 30px 0 15px;
    color: var(--text-primary);
}

.legal-content p {
    margin-bottom: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.legal-content ul {
    margin-bottom: 20px;
    padding-left: 25px;
}

.legal-content li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    list-style: disc;
}

.legal-date {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

/* ========================================
   404 Page
   ======================================== */
.error-page {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 20px;
}

.error-content h1 {
    font-size: 8rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.error-content h2 {
    font-size: 2rem;
    margin: 20px 0;
}

.error-content p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: 15px;
}

.footer-brand p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.footer-links a {
    display: block;
    color: var(--text-light);
    padding: 6px 0;
    font-size: 0.95rem;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    gap: 20px;
}

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

/* ========================================
   Pagination
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.pagination a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
}

.pagination a:hover,
.pagination a.active {
    background: var(--primary);
    color: white;
}

/* ========================================
   Test List Page
   ======================================== */
.test-card {
    cursor: pointer;
}

.test-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.test-difficulty {
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.test-difficulty.facil { background: #D1FAE5; color: #065F46; }
.test-difficulty.intermedio { background: #FEF3C7; color: #92400E; }
.test-difficulty.dificil { background: #FEE2E2; color: #991B1B; }

.test-meta {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.test-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* ========================================
   Feature Boxes
   ======================================== */
.feature-box {
    display: flex;
    gap: 20px;
    padding: 25px;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.feature-content h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.feature-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ========================================
   Breadcrumb
   ======================================== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.breadcrumb a {
    color: var(--text-secondary);
}

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

.breadcrumb span {
    color: var(--text-light);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-main {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow-lg);
        display: none;
    }

    .nav-main.active {
        display: flex;
    }

    .nav-main a {
        width: 100%;
        padding: 12px;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        padding-left: 20px;
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .results-stats {
        grid-template-columns: 1fr;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .test-info {
        flex-direction: column;
        text-align: center;
    }

    .progress-bar {
        width: 100%;
    }

    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .card-content {
        padding: 15px;
    }

    .question-card {
        padding: 20px;
    }

    .contact-form {
        padding: 25px;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-fadeIn {
    animation: fadeIn 0.5s ease forwards;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.hidden { display: none !important; }
.visible { display: block !important; }