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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* ===== Header Styles ===== */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav a:hover,
.nav a.active {
    background-color: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

/* ===== Main Content ===== */
.main {
    min-height: calc(100vh - 120px);
    padding: 2rem 0;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    margin-bottom: 3rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #fff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin: 2rem 0;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ffd700;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* ===== Button Styles ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(238, 90, 36, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* ===== Section Styles ===== */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2d3748;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    margin: 1rem auto;
    border-radius: 2px;
}

/* ===== Features Section ===== */
.features {
    padding: 4rem 0;
    background: white;
    margin: 2rem 0;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.05);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.feature p {
    color: #718096;
    line-height: 1.6;
}

/* ===== Topics Grid ===== */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.topic-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    border-left: 4px solid #667eea;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.topic-category {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

.topic-difficulty {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.difficulty-beginner {
    background-color: #d4f8d4;
    color: #2d5a2d;
}

.difficulty-intermediate {
    background-color: #fff3cd;
    color: #856404;
}

.difficulty-advanced {
    background-color: #f8d7da;
    color: #721c24;
}

.topic-title {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.topic-description {
    color: #718096;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.topic-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: #718096;
}

.topic-duration {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.topic-status.completed {
    color: #38a169;
    font-weight: 600;
}

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

/* ===== Page Header ===== */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h2 {
    font-size: 2.5rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    color: #718096;
}

/* ===== Filter Section ===== */
.topics-filter {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.topics-filter h3 {
    margin-bottom: 1rem;
    color: #2d3748;
}

.filter-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: #f7fafc;
    color: #4a5568;
    text-decoration: none;
    border-radius: 25px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    transform: translateY(-2px);
}

/* ===== Roadmap Styles ===== */
.roadmap-container {
    max-width: 900px;
    margin: 0 auto;
}

.roadmap-item {
    background: white;
    margin-bottom: 2rem;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    border-left: 5px solid;
}

.roadmap-item.foundation { border-left-color: #38a169; }
.roadmap-item.core-skills { border-left-color: #3182ce; }
.roadmap-item.devops { border-left-color: #d69e2e; }
.roadmap-item.advanced { border-left-color: #e53e3e; }

.roadmap-header {
    padding: 1.5rem 2rem;
    background: linear-gradient(45deg, #f7fafc, #edf2f7);
}

.roadmap-phase {
    display: inline-block;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 0.3rem 1rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.roadmap-title {
    font-size: 1.5rem;
    color: #2d3748;
    margin-bottom: 0.5rem;
}

.roadmap-description {
    color: #718096;
    line-height: 1.6;
}

.roadmap-content {
    padding: 2rem;
}

.roadmap-skills,
.roadmap-resources {
    margin-bottom: 1.5rem;
}

.roadmap-skills h4,
.roadmap-resources h4 {
    color: #2d3748;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.roadmap-skills ul,
.roadmap-resources ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
    list-style: none;
}

.roadmap-skills li,
.roadmap-resources li {
    background: #f7fafc;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    color: #4a5568;
    font-size: 0.9rem;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.empty-state h3 {
    font-size: 2rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.empty-state p {
    color: #718096;
    margin-bottom: 2rem;
}

/* ===== Footer ===== */
.footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer p {
    opacity: 0.8;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .nav {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-buttons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .topic-card {
        padding: 1.5rem;
    }
    
    .topics-filter {
        padding: 1.5rem;
    }
}

/* ===== Animation Classes ===== */
.fade-in {
    animation: fadeIn 0.6s ease-in;
}

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

.slide-in {
    animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ===== Additional Missing CSS Classes ===== */

/* Breadcrumb navigation */
.breadcrumb {
    margin-bottom: 2rem;
    color: #718096;
}

.breadcrumb a {
    color: #667eea;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Tab content for topic details */
.content-tabs {
    display: flex;
    border-bottom: 2px solid #e2e8f0;
    margin-bottom: 2rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 1rem 2rem;
    cursor: pointer;
    font-weight: 600;
    color: #718096;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Topic detail styles */
.topic-detail {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.topic-detail-header {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid #f7fafc;
}

.theory-content {
    line-height: 1.8;
    color: #4a5568;
}

.practical-steps {
    margin-top: 1rem;
}

.steps-list {
    list-style: none;
    counter-reset: step-counter;
}

.step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: #f7fafc;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.step::before {
    counter-increment: step-counter;
    content: counter(step-counter);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    font-weight: bold;
    font-size: 0.9rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    line-height: 1.6;
}

.step-done {
    background: #38a169;
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    margin-left: 1rem;
    opacity: 0.3;
    transition: opacity 0.3s ease;
}

.step-done.completed {
    opacity: 1;
}

.prerequisites-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.prerequisites-list li {
    background: #e6fffa;
    color: #2d5a5a;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border-left: 3px solid #38b2ac;
}

/* Challenge styles */
.challenges-header {
    text-align: center;
    margin-bottom: 3rem;
}

.progress-bar {
    background: #e2e8f0;
    height: 8px;
    border-radius: 4px;
    margin: 1rem auto;
    max-width: 400px;
    overflow: hidden;
}

.progress-fill {
    background: linear-gradient(45deg, #667eea, #764ba2);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: #718096;
}

.challenges-container {
    max-width: 800px;
    margin: 0 auto;
}

.challenge-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    border-left: 4px solid #667eea;
}

.challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.challenge-number {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.challenge-difficulty {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.challenge-difficulty.easy {
    background-color: #d4f8d4;
    color: #2d5a2d;
}

.challenge-difficulty.medium {
    background-color: #fff3cd;
    color: #856404;
}

.challenge-difficulty.hard {
    background-color: #f8d7da;
    color: #721c24;
}

.challenge-question h3 {
    color: #2d3748;
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.challenge-options {
    margin: 2rem 0;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: #f7fafc;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.option-label:hover {
    background: #edf2f7;
    border-color: #667eea;
}

.option-label input[type="radio"] {
    margin-right: 1rem;
}

.option-text {
    line-height: 1.4;
}

.challenge-actions {
    text-align: center;
    margin: 2rem 0;
}

.challenge-result {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid;
}

.challenge-result.correct {
    background: #e6fffa;
    border-left-color: #38a169;
}

.challenge-result.incorrect {
    background: #fed7d7;
    border-left-color: #e53e3e;
}

.result-status {
    font-weight: 600;
    margin-bottom: 1rem;
}

.result-status.correct {
    color: #38a169;
}

.result-status.incorrect {
    color: #e53e3e;
}

.result-explanation {
    color: #4a5568;
    line-height: 1.6;
}

.challenges-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid #f7fafc;
}

.no-challenges {
    text-align: center;
    padding: 4rem 2rem;
    background: #f7fafc;
    border-radius: 12px;
}

.no-challenges h3 {
    color: #4a5568;
    margin-bottom: 1rem;
}

.no-challenges p {
    color: #718096;
    margin-bottom: 2rem;
}

/* Roadmap styles */
.roadmap-container {
    max-width: 900px;
    margin: 0 auto;
}

.roadmap-phase {
    background: white;
    margin-bottom: 2rem;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    border-left: 5px solid #667eea;
}

.phase-header {
    display: flex;
    align-items: center;
    padding: 2rem;
    background: linear-gradient(45deg, #f7fafc, #edf2f7);
}

.phase-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    font-weight: bold;
    font-size: 1.5rem;
    margin-right: 1.5rem;
}

.phase-title {
    color: #2d3748;
    font-size: 1.8rem;
}

.phase-content {
    padding: 2rem;
}

.skills-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.skill-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: #f7fafc;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.skill-checkbox {
    margin-right: 1rem;
    font-size: 1.2rem;
    cursor: pointer;
    color: #718096;
    transition: color 0.3s ease;
}

.skill-checkbox.checked {
    color: #38a169;
}

.skill-name {
    line-height: 1.4;
    color: #4a5568;
}

.roadmap-tips {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin: 2rem 0;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tip {
    padding: 1.5rem;
    background: #f7fafc;
    border-radius: 8px;
    border-left: 3px solid #667eea;
}

.tip h4 {
    color: #2d3748;
    margin-bottom: 1rem;
}

.tip p {
    color: #718096;
    line-height: 1.6;
}

.roadmap-actions {
    text-align: center;
    margin: 3rem 0;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .challenges-footer {
        flex-direction: column;
        gap: 1rem;
    }
    
    .phase-header {
        flex-direction: column;
        text-align: center;
    }
    
    .phase-number {
        margin-bottom: 1rem;
        margin-right: 0;
    }
    
    .content-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: 120px;
    }
}

/* Roadmap Specific Styles */
.roadmap-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin: 40px 0;
    position: relative;
}

/* Add connecting line between phases */
.roadmap-container::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 80px;
    bottom: 80px;
    width: 3px;
    background: linear-gradient(to bottom, #007bff, #28a745);
    border-radius: 2px;
}

.roadmap-phase {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border-left: 4px solid #007bff;
    position: relative;
    transition: all 0.3s ease;
}

.roadmap-phase:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.roadmap-phase:nth-child(even) {
    border-left-color: #28a745;
}

.roadmap-phase:nth-child(odd) {
    border-left-color: #007bff;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 15px;
    min-width: 250px;
}

.phase-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    flex-shrink: 0;
    position: relative;
    z-index: 2;
}

.roadmap-phase:nth-child(even) .phase-number {
    background: linear-gradient(135deg, #28a745, #1e7e34);
}

.phase-title {
    font-size: 1.8rem;
    color: #333;
    margin: 0;
    font-weight: 600;
}

.phase-content {
    flex: 1;
}

.skills-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 10px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.skill-item:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.skill-checkbox {
    font-size: 18px;
    color: #6c757d;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s ease;
}

.skill-checkbox.completed {
    color: #28a745;
}

.skill-name {
    font-size: 1rem;
    color: #495057;
    font-weight: 500;
}

.skill-item.completed .skill-name {
    text-decoration: line-through;
    color: #6c757d;
}

/* Tips Section */
.roadmap-tips {
    margin: 50px 0;
    padding: 30px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 15px;
}

.roadmap-tips h3 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.tip {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.tip h4 {
    color: #007bff;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.tip p {
    color: #6c757d;
    line-height: 1.6;
}

/* Actions */
.roadmap-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 40px 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .roadmap-container::before {
        left: 15px;
    }
    
    .roadmap-phase {
        flex-direction: column;
        padding: 20px;
        text-align: center;
    }
    
    .phase-header {
        justify-content: center;
        min-width: auto;
        margin-bottom: 20px;
    }
    
    .skills-list {
        grid-template-columns: 1fr;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .roadmap-actions {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .phase-number {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .phase-title {
        font-size: 1.5rem;
    }
}


/* ===== Loading States ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }