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

:root {
    /* Couleurs principales - Mode clair */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    
    /* Couleurs de texte - Mode clair */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #64748b;
    --text-inverse: #ffffff;
    
    /* Couleurs de fond - Mode clair */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --bg-card: #ffffff;
    
    /* Couleurs de bordure */
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Rayons de bordure */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-size: 1rem;
    overflow-x: hidden;
}

/* Skip link pour l'accessibilité */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 10000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* Utilitaires */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus visible pour l'accessibilité */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Amélioration du contraste pour les éléments interactifs */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 1px var(--primary-color);
}

/* Contraste amélioré pour les liens généraux */
a:not(.nav-link):not(.cta-button):not(.projet-link):not(.contact-link):not(.footer-links a) {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-color: transparent;
    transition: text-decoration-color var(--transition-normal);
}

a:not(.nav-link):not(.cta-button):not(.projet-link):not(.contact-link):not(.footer-links a):hover {
    text-decoration-color: var(--primary-color);
}

a:not(.nav-link):not(.cta-button):not(.projet-link):not(.contact-link):not(.footer-links a):visited {
    color: var(--primary-dark);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all var(--transition-normal);
    will-change: transform, background-color;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
}

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

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-normal);
    position: relative;
}

.nav-logo a:hover {
    color: var(--primary-dark);
}

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

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

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-normal);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

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

/* Hamburger menu pour mobile */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.hamburger:hover {
    background: var(--bg-secondary);
    transform: scale(1.1);
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: all var(--transition-normal);
    border-radius: 2px;
}

.hamburger:hover .bar {
    background-color: var(--primary-color);
}

/* Section Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding-top: 70px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.2s forwards;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-weight: 500;
    opacity: 0;
    animation: fadeInUp 1s ease 0.4s forwards;
}

.hero-description {
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.6s forwards;
}

.hero-description p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.hero-image {
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.8s forwards;
}

.profile-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: 0 20px 40px rgba(37, 99, 235, 0.2);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.profile-placeholder::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: rotate 3s linear infinite;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.profile-placeholder:hover::before {
    opacity: 1;
}

.placeholder-icon {
    font-size: 4rem;
}

.hero-cta {
    opacity: 0;
    animation: fadeInUp 1s ease 1s forwards;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: white;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.4);
}

.cta-button.secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    margin-left: var(--spacing-md);
}

.cta-button.secondary:hover {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
}

/* Sections générales */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

/* Section Parcours */
.parcours {
    background-color: #f8fafc;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    width: 4px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.timeline-item:nth-child(1) { animation-delay: 0.2s; }
.timeline-item:nth-child(2) { animation-delay: 0.4s; }
.timeline-item:nth-child(3) { animation-delay: 0.6s; }

.timeline-marker {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border: 4px solid white;
    border-radius: 50%;
    top: 20px;
    left: 50%;
    margin-left: -10px;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.2);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.timeline-marker:hover {
    transform: scale(1.3);
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.3);
    background: var(--primary-dark);
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 45%;
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
    left: 55%;
}

.timeline-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.timeline-date {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.timeline-content p:last-child {
    color: var(--text-secondary);
    line-height: 1.6;
}

.skills-list {
    list-style: none;
    margin-top: var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skills-list li {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

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

.projet-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.projet-card:nth-child(1) { animation-delay: 0.2s; }
.projet-card:nth-child(2) { animation-delay: 0.4s; }
.projet-card:nth-child(3) { animation-delay: 0.6s; }

.projet-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.projet-image {
    height: 200px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.projet-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.projet-card:hover .projet-image::before {
    left: 100%;
}

.projet-placeholder {
    font-size: 3rem;
}

.projet-content {
    padding: 2rem;
}

.projet-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.projet-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.projet-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-normal);
}

.projet-link:hover {
    color: var(--primary-dark);
}

.projet-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.tech-tag {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.projet-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.projet-link.external::after {
    content: '↗';
    margin-left: var(--spacing-xs);
    font-size: 0.875rem;
}

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

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    background: var(--bg-card);
    padding: 1.5rem 2rem;
    border-radius: 15px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-color);
    border-color: var(--border-hover);
}

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

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-2xl) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer p {
    color: var(--text-light);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

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

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

/* Nouveaux éléments */
.loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow);
}

.loading-indicator.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Classes d'animation essentielles */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.animate-on-scroll.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Animations de chargement */
.loading-indicator .spinner {
    animation: rotate 1s linear infinite;
}

/* Mode sombre */
@media (prefers-color-scheme: dark) {
    :root {
        /* Couleurs de texte - Mode sombre */
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-light: #94a3b8;
        --text-inverse: #0f172a;
        
        /* Couleurs de fond - Mode sombre */
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-card: #1e293b;
        
        /* Couleurs de bordure - Mode sombre */
        --border-color: #334155;
        --border-hover: #475569;
        
        /* Ombres adaptées au mode sombre */
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    }
    
    .navbar {
        background: rgba(15, 23, 42, 0.95);
        border-bottom-color: var(--border-color);
    }
    
    .navbar.scrolled {
        background: rgba(15, 23, 42, 0.98);
    }
    
    .hero {
        background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    }
    
    .parcours {
        background-color: var(--bg-secondary);
    }
    
    .contact {
        background-color: var(--bg-secondary);
    }
    
    .timeline-content {
        background: var(--bg-card);
        border: 1px solid var(--border-color);
    }
    
    .projet-card {
        background: var(--bg-card);
        border: 1px solid var(--border-color);
    }
    
    .skills-list li {
        background: var(--bg-tertiary);
        color: var(--text-secondary);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-card);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
        border-top: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-marker {
        left: 10px;
    }
    
    .timeline-content {
        width: 100%;
        left: 0 !important;
    }
    
    .projets-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-links {
        gap: 1rem;
    }
    
    .contact-link {
        padding: 1rem 1.5rem;
    }
    
    .cta-button.secondary {
        margin-left: 0;
        margin-top: var(--spacing-md);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .profile-placeholder {
        width: 150px;
        height: 150px;
    }
    
    .placeholder-icon {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .timeline-content {
        padding: 1.5rem;
    }
    
    .projet-content {
        padding: 1.5rem;
    }
}