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

:root {
    --primary-color: #1a3a52;
    --secondary-color: #2e6f95;
    --accent-color: #e67e22;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #27ae60;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.08);
    --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
    --shadow-heavy: 0 10px 40px rgba(0,0,0,0.2);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, #1a3a52 0%, #2e6f95 100%);
    --gradient-accent: linear-gradient(135deg, #e67e22 0%, #d35400 100%);
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-dark);
}

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

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

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

/* ================================
   Header et Navigation
   ================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-light);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.header.scrolled {
    box-shadow: var(--shadow-medium);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.2rem;
}

.logo .tagline {
    font-size: 0.75rem;
    color: var(--text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-dark);
    padding: 0.5rem 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.burger-menu span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition-smooth);
}

/* ================================
   Section Hero
   ================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--bg-white);
    padding: 100px 20px 60px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)" /></svg>');
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(46, 111, 149, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(230, 126, 34, 0.2) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 1100px;
    animation: fadeInUp 1s ease;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #f39c12;
}

.hero-description {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 3rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
    padding: 2rem 0;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-color);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.stat-label {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 3rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 50px;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: 2px solid transparent;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--bg-white);
    box-shadow: 0 4px 15px rgba(230, 126, 34, 0.3);
}

.btn-primary:hover {
    background: #d35400;
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(230, 126, 34, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

.btn-secondary:hover {
    background: var(--bg-white);
    color: var(--primary-color);
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--bg-white);
    border-radius: 50%;
    animation: scroll 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes scroll {
    0% { opacity: 1; top: 10px; }
    100% { opacity: 0; top: 30px; }
}

/* ================================
   Sections Communes
   ================================ */
section {
    padding: 80px 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    margin: 0 auto 1.5rem;
    border-radius: 2px;
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* ================================
   Section À Propos
   ================================ */
.about {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.about-text .lead {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.credentials,
.expertise-areas {
    margin-top: 3rem;
}

.credentials h4,
.expertise-areas h4 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.credentials-list {
    list-style: none;
}

.credentials-list li {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
    font-size: 1rem;
}

.credentials-list li:last-child {
    border-bottom: none;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.expertise-card {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-smooth);
}

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

.expertise-card h5 {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
}

.expertise-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.6;
}

.about-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.profile-card,
.timeline-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-medium);
}

.profile-image {
    width: 150px;
    height: 150px;
    margin: 0 auto 1.5rem;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 800;
    color: var(--bg-white);
    box-shadow: var(--shadow-medium);
}

.profile-card h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.profile-card .title {
    text-align: center;
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.contact-info {
    border-top: 2px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
    padding: 1.5rem 0;
    margin: 1.5rem 0;
}

.contact-info p {
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
}

.languages h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.languages ul {
    list-style: none;
}

.languages li {
    padding: 0.5rem 0;
    color: var(--text-dark);
}

.timeline-card h4 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 1.5rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.4rem;
    top: 5px;
    width: 10px;
    height: 10px;
    background: var(--accent-color);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--bg-white);
}

.timeline-item .year {
    font-weight: 700;
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.3rem;
}

.timeline-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ================================
   Section Services
   ================================ */
.services {
    background: var(--bg-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.service-card {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 15px;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--accent-color);
}

.service-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    display: block;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.service-card > p {
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.service-features {
    list-style: none;
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: var(--bg-white);
    border-radius: 10px;
}

.service-features li {
    padding: 0.6rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.service-features li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: 700;
}

.service-link {
    display: inline-block;
    margin-top: 1rem;
    color: var(--accent-color);
    font-weight: 600;
    transition: var(--transition-smooth);
}

.service-link:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

/* ================================
   Section Expertise Technique
   ================================ */
.expertise {
    background: var(--bg-light);
}

.tech-section {
    margin-bottom: 4rem;
}

.tech-section:last-child {
    margin-bottom: 0;
}

.tech-section > h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--accent-color);
}

.tech-details {
    display: grid;
    gap: 2rem;
}

.tech-detail-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    border-left: 5px solid var(--accent-color);
}

.tech-detail-card h4 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.tech-detail-card > p {
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.specs {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 1.5rem;
}

.specs p {
    margin-bottom: 0.8rem;
    color: var(--text-dark);
    line-height: 1.7;
}

.specs p:last-child {
    margin-bottom: 0;
}

.specs strong {
    color: var(--primary-color);
}

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

.material-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-smooth);
}

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

.material-card h4 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid var(--accent-color);
}

.material-card ul {
    list-style: none;
}

.material-card li {
    padding: 0.6rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-dark);
}

.material-card li::before {
    content: '●';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.cert-item {
    text-align: center;
}

.cert-badge {
    display: inline-block;
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    color: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    margin: 0 auto 1rem;
    box-shadow: var(--shadow-medium);
}

.cert-item p {
    font-size: 0.9rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* ================================
   Section Projets
   ================================ */
.projects {
    background: var(--bg-white);
}

.projects-grid {
    display: grid;
    gap: 2.5rem;
}

.project-card {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-smooth);
    border-left: 5px solid var(--accent-color);
}

.project-card:hover {
    box-shadow: var(--shadow-heavy);
    transform: translateX(5px);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.project-header h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    flex: 1;
}

.project-year {
    background: var(--accent-color);
    color: var(--bg-white);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 700;
    font-size: 0.9rem;
}

.project-description {
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.project-details {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 1.5rem;
}

.project-details p {
    margin-bottom: 0.8rem;
    color: var(--text-dark);
    line-height: 1.7;
}

.project-details p:last-child {
    margin-bottom: 0;
}

.project-details strong {
    color: var(--primary-color);
    font-weight: 600;
}

.project-stats {
    margin-top: 4rem;
    padding: 3rem;
    background: var(--gradient-primary);
    border-radius: 20px;
    color: var(--bg-white);
    text-align: center;
}

.project-stats h3 {
    font-size: 2rem;
    margin-bottom: 2.5rem;
    color: var(--bg-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    padding: 1.5rem;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.stat-num {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 1rem;
    opacity: 0.95;
}

/* ================================
   Section Partenaires
   ================================ */
.partners {
    background: var(--bg-light);
}

.partners-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
}

.partners-text p {
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.8;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.partner-category {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
}

.partner-category h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--accent-color);
}

.partner-category ul {
    list-style: none;
}

.partner-category li {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
    transition: var(--transition-smooth);
}

.partner-category li:last-child {
    border-bottom: none;
}

.partner-category li:hover {
    color: var(--accent-color);
    padding-left: 10px;
}

/* ================================
   Section Contact
   ================================ */
.contact {
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    align-items: start;
}

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

.contact-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
}

.contact-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    color: var(--primary-color);
    margin-bottom: 0.3rem;
    font-size: 1.1rem;
}

.contact-item p {
    color: var(--text-dark);
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}

.office-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.office-item {
    padding: 1rem;
    background: var(--bg-white);
    border-radius: 10px;
    border-left: 4px solid var(--accent-color);
}

.office-item strong {
    display: block;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}

.office-item p {
    font-size: 0.9rem;
    color: var(--text-dark);
    margin-bottom: 0.3rem;
}

.contact-form-section {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-medium);
}

.contact-form h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

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

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.9rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-smooth);
    background: var(--bg-white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(230, 126, 34, 0.1);
}

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

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 400;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.btn-large {
    width: 100%;
    padding: 1.2rem;
    font-size: 1.1rem;
    margin-top: 1rem;
}

.form-note {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 1rem;
}

/* ================================
   Footer
   ================================ */
.footer {
    background: var(--primary-color);
    color: var(--bg-white);
    padding: 3rem 20px 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    color: var(--bg-white);
    margin-bottom: 1.5rem;
}

.footer-section h3 {
    font-size: 1.5rem;
}

.footer-section h4 {
    font-size: 1.2rem;
}

.footer-tagline {
    font-style: italic;
    opacity: 0.8;
    margin-top: 0.5rem;
}

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

.footer-section li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
    transition: var(--transition-smooth);
}

.footer-section a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.2);
}

.footer-bottom p {
    opacity: 0.8;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-white);
        transition: var(--transition-smooth);
        box-shadow: var(--shadow-medium);
    }
    
    .nav.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        padding: 2rem;
        gap: 0;
    }
    
    .nav-list li {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-link {
        display: block;
        padding: 1rem 0;
    }
    
    .burger-menu {
        display: flex;
    }
    
    .burger-menu.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .burger-menu.active span:nth-child(2) {
        opacity: 0;
    }
    
    .burger-menu.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .services-grid,
    .partners-grid,
    .materials-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .project-header {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    section {
        padding: 60px 15px;
    }
    
    .service-card,
    .project-card {
        padding: 1.5rem;
    }
}

/* ================================
   Animations et Utilitaires
   ================================ */
.fade-in {
    animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-in-left {
    animation: slideInLeft 0.8s ease;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.8s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Impression */
@media print {
    .header,
    .hero-buttons,
    .scroll-indicator,
    .contact-form,
    .footer {
        display: none;
    }
    
    section {
        page-break-inside: avoid;
    }
}