/* === BASE.CSS - Styles de base et navigation === */

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

html {
    scroll-behavior: smooth;
    color-scheme: light only;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* === NAVIGATION === */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #2563eb;
    font-size: 1.5rem;
    font-weight: 700;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

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

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

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    padding: 1rem 0;
    min-width: 250px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    list-style: none;
}

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

.dropdown-menu li a {
    display: block;
    padding: 0.5rem 1.5rem;
    color: #333;
    text-decoration: none;
    transition: background 0.3s ease;
}

.dropdown-menu li a:hover {
    background: #f1f5f9;
    color: #2563eb;
}

/* Mobile close */
.mobile-close {
    display: none !important;
}

/* Hamburger menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    position: relative;
    width: 30px;
    height: 30px;
    justify-content: center;
    align-items: center;
    background: none !important;
    border: none !important;
    outline: none !important;
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0 !important;
    transition: 0.3s;
    border-radius: 2px;
}

.close-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    color: #333;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 10;
    display: none !important;
    visibility: hidden !important;
    background: none !important;
    border: none !important;
    outline: none !important;
}

.hamburger.active .close-icon {
    opacity: 1 !important;
    display: block !important;
    visibility: visible !important;
    background: none !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
}

.hamburger.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: white;
    padding-top: 70px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1;
}

.hero-content {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: #f8fafc;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #f1f5f9;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.6);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:hover {
    background: white;
    color: #2563eb;
    transform: translateY(-2px);
}

.btn-youtube {
    background: #ff0000;
    color: white;
    font-size: 1.1rem;
    padding: 15px 30px;
}

.btn-youtube:hover {
    background: #cc0000;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 0, 0, 0.3);
}

/* Images */
.hero-img {
    width: 500px;
    height: 375px;
    border-radius: 25px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    object-fit: cover;
    object-position: center;
}

.hero-img:hover {
    transform: scale(1.05);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.25);
}

.cours-img, .presentation-img {
    width: 400px;
    height: 300px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    object-fit: cover;
    object-position: center;
}

.cours-img:hover, .presentation-img:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.image-placeholder {
    background: rgba(255, 255, 255, 0.1);
    border: 2px dashed rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    color: white;
    backdrop-filter: blur(10px);
}

.image-placeholder i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.image-placeholder p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Sections */
section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1e293b;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #64748b;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Presentation */
.presentation {
    background: #f8fafc;
}

.presentation-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.presentation-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: #475569;
    line-height: 1.8;
}

.presentation-image .image-placeholder {
    background: rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.3);
    color: #2563eb;
}

/* Sections grid */
.sections {
    background: white;
}

.sections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.section-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.section-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon i {
    font-size: 1.5rem;
    color: white;
}

.section-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.section-card p {
    color: #64748b;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.card-link {
    color: #2563eb;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.card-link:hover {
    color: #1d4ed8;
}

/* Cours particuliers */
.cours-particuliers {
    background: #f1f5f9;
}

.cours-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.cours-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.cours-text p {
    font-size: 1.1rem;
    color: #475569;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.cours-list {
    list-style: none;
    margin-bottom: 2rem;
}

.cours-list li {
    display: flex;
    align-items: center;
    margin-bottom: 0.8rem;
    color: #475569;
    font-size: 1.1rem;
}

.cours-list i {
    color: #10b981;
    margin-right: 0.8rem;
    font-size: 1.2rem;
}

.cours-image .image-placeholder {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: #10b981;
}

/* Cours en ligne */
.cours-en-ligne {
    background: white;
}

.niveaux-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.niveau-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.niveau-card {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 15px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    cursor: pointer;
}

.niveau-card-link:hover .niveau-card,
.niveau-card:hover {
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.niveau-card-link:hover {
    text-decoration: none;
    color: inherit;
}

.niveau-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: #1e293b;
}

.niveau-card p {
    color: #64748b;
    line-height: 1.5;
}

/* YouTube */
.youtube {
    background: #fef2f2;
}

.youtube-header {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
}

.youtube-image {
    flex: 0 0 400px;
}

.youtube-content {
    flex: 1;
}

.youtube-note {
    text-align: center;
    font-style: italic;
    color: #dc2626;
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.video-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.video-thumbnail {
    background: #ff0000;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.video-thumbnail i {
    font-size: 3rem;
}

.video-card h4 {
    padding: 1rem 1rem 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: #1e293b;
}

.video-card p {
    padding: 0 1rem 1rem;
    color: #64748b;
    font-size: 0.9rem;
}

.youtube-cta {
    text-align: center;
}

/* Contact */
.contact {
    background: #f8fafc;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

.contact-item i {
    width: 50px;
    height: 50px;
    background: #2563eb;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.contact-item h3,
.contact-item h4 {
    color: #1e293b;
    margin-bottom: 0.3rem;
}

.contact-item p {
    color: #64748b;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: #f1f5f9;
}

.footer-section p,
.footer-section li {
    color: #cbd5e1;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #60a5fa;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: #374151;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: #2563eb;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* YouTube profile image */
.youtube-profile-img {
    border-radius: 50%;
    object-fit: cover;
    width: 200px;
    height: 200px;
    aspect-ratio: 1 / 1;
}

/* Video iframe */
.video-iframe-container {
    width: 100%;
    aspect-ratio: 16/9;
    height: 315px;
    max-width: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-iframe-container iframe {
    width: 100%;
    height: 100%;
    aspect-ratio: 16/9;
    display: block;
    border: none;
}

/* Lazy loading */
.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lazy-image.loaded {
    opacity: 1;
}

.lazy-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

img[loading="lazy"] {
    min-height: 100px;
    background: #f8f9fa;
}