/* ========== VARIABLES CSS ========== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #0f172a;
    --accent: #8b5cf6;
    --light: #f8fafc;
    --gray: #64748b;
    --light-gray: #e2e8f0;
    --success: #10b981;
    --transition: all 0.3s ease;
    --shadow: 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);
    --border-radius: 16px;
}

/* ========== RESET & BASE ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--secondary);
    background-color: var(--light);
    overflow-x: hidden;
}

/* ========== HEADER ========== */
.header {
    background: linear-gradient(135deg, var(--secondary) 0%, #1e293b 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, #60a5fa, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo span {
    color: white;
    font-weight: 300;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: #60a5fa;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #60a5fa, #8b5cf6);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* ========== MAIN CONTENT ========== */
.main-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* ========== BLOG/ACTUALITES ========== */
.blog-header {
    text-align: center;
    margin-bottom: 3rem;
}

.blog-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-header p {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

.blog-posts {
    display: grid;
    gap: 2rem;
}

.blog-post {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease-out;
}

.blog-post:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--gray);
    font-size: 0.9rem;
}

.post-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-category {
    background: linear-gradient(45deg, var(--primary), var(--accent));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.post-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--secondary);
    line-height: 1.3;
}

.post-excerpt {
    color: var(--gray);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.read-more:hover {
    color: var(--primary-dark);
    gap: 0.75rem;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--secondary);
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
}

.footer-about h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-about h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(45deg, #60a5fa, #8b5cf6);
    border-radius: 2px;
}

.footer-about p {
    color: var(--light-gray);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: white;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--light-gray);
}

.footer-contact-item i {
    color: #60a5fa;
}

.footer-links h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: white;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--light-gray);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: #60a5fa;
    text-decoration: underline;
}

.footer-bottom {
    max-width: 1200px;
    margin: 2rem auto 0;
    padding: 2rem 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: var(--light-gray);
    font-size: 0.9rem;
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .main-wrapper {
        padding: 1rem;
    }

    .blog-header h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.25rem;
    }

    .nav-menu {
        gap: 0.75rem;
    }

    .nav-menu a {
        font-size: 0.95rem;
    }

    .blog-post {
        padding: 1.5rem;
    }

    .post-title {
        font-size: 1.25rem;
    }
}
/* ========== HERO SECTION ========== */
.hero-section {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 4rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ========== WELCOME SECTION ========== */
.welcome-section {
    margin-bottom: 4rem;
}

.welcome-content {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s ease-out;
}

.welcome-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--secondary);
    position: relative;
    padding-bottom: 0.5rem;
}

.welcome-content h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.welcome-content p {
    font-size: 1.1rem;
    color: var(--gray);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* ========== BUTTONS ========== */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    margin: 0.5rem;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary), var(--accent));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* ========== SECTIONS OVERVIEW ========== */
.sections-overview {
    margin-bottom: 4rem;
}

.sections-overview h2 {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--secondary);
    position: relative;
}

.sections-overview h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    border-radius: 2px;
}

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

.section-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.section-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.section-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.section-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--secondary);
}

.section-card p {
    color: var(--gray);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.section-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.section-link:hover {
    color: var(--primary-dark);
    gap: 0.75rem;
}

/* ========== Responsive adjustments for index ========== */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .welcome-content {
        padding: 1.5rem;
    }
    
    .btn-primary, .btn-secondary {
        display: block;
        margin: 0.5rem auto;
        max-width: 250px;
    }
    
    .sections-overview h2 {
        font-size: 2rem;
    }
    
    .sections-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .section-card {
        padding: 1.5rem;
    }
    
    .section-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .sections-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== ARCHITECTURE COURSE STYLES ========== */
.course-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.course-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.course-header h5 {
    font-size: 1.2rem;
    color: var(--gray);
    font-weight: 500;
}

.content-grid {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 2rem;
    margin-bottom: 4rem;
}

.main-content {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.course-section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--secondary);
    position: relative;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.course-item,
.td-item,
.tp-item {
    background: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--primary);
}

.course-item h3,
.td-item h3,
.tp-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--secondary);
}

.course-item h3 a,
.td-item h3 a,
.tp-item h3 a {
    color: var(--primary);
    text-decoration: none;
}

.course-item h3 a:hover,
.td-item h3 a:hover,
.tp-item h3 a:hover {
    color: var(--primary-dark);
}

.note {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 1rem;
    border-radius: 0 4px 4px 0;
    margin: 1rem 0;
    font-style: italic;
}

.note i {
    color: #f59e0b;
    margin-right: 0.5rem;
}

.video-container {
    margin: 1.5rem 0;
    position: relative;
    overflow: hidden;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.download-list {
    list-style: none;
    padding: 0;
}

.download-list li {
    padding: 1rem;
    margin-bottom: 0.75rem;
    background: var(--light-gray);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.download-list a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.download-list a:hover {
    color: var(--primary-dark);
}

.course-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 0.5rem 0;
}

/* ========== SIDEBAR ========== */
.sidebar {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    align-self: start;
}

.sidebar-nav h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--secondary);
    position: relative;
    padding-bottom: 0.5rem;
}

.sidebar-nav h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
}

.sidebar-nav li {
    margin-bottom: 0.75rem;
}

.sidebar-nav a {
    color: var(--gray);
    text-decoration: none;
    padding: 0.5rem 0;
    display: block;
    transition: var(--transition);
    border-radius: 4px;
}

.sidebar-nav a:hover {
    color: var(--primary);
    padding-left: 0.5rem;
    background: var(--light);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .course-header h1 {
        font-size: 1.8rem;
    }
    
    .main-content {
        padding: 1.5rem;
    }
    
    .course-item,
    .td-item,
    .tp-item {
        padding: 1rem;
    }
    
    .sidebar {
        margin-top: 2rem;
    }
}

@media (max-width: 480px) {
    .course-header {
        padding: 1.5rem;
    }
    
    .course-header h1 {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .download-list li {
        flex-direction: column;
        align-items: flex-start;
    }
}
/* ========== MENU DEROULANT CORRIGÉ ========== */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--secondary);
    min-width: 220px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1001;
    border-radius: 8px;
    top: 100%;
    left: 0;
    margin-top: 5px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.dropdown-content a {
    color: white;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    font-size: 0.95rem;
    transition: var(--transition);
}

.dropdown-content a:hover {
    background: linear-gradient(45deg, var(--primary), var(--accent));
}

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

.dropbtn i {
    margin-left: 5px;
    font-size: 0.8rem;
}

/* Ajustement pour le menu principal */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.nav-menu a:hover {
    color: #60a5fa;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #60a5fa, #8b5cf6);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}