:root {
    --primary: #9b51e0;
    --primary-light: #2e1065;
    --primary-dark: #7a3bbb;
    
    /* Variables par défaut : Mode Sombre */
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --navbar-bg: rgba(15, 23, 42, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
}

body.light-mode {
    /* Bascule alternative : Mode Clair */
    --primary-light: #f3e8ff;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --navbar-bg: rgba(255, 255, 255, 0.85);
    --border-color: rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.7;
    padding-top: 80px; 
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate {
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* Inversion linguistique : EN visible par défaut, FR masqué */
.lang-fr { display: none !important; }
body.fr-active .lang-en { display: none !important; }
body.fr-active .lang-fr { display: block !important; }
body.fr-active span.lang-fr { display: inline !important; }
body.fr-active a.lang-fr { display: inline-block !important; }

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.navbar-brand span {
    color: var(--primary);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.3s ease;
}

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

.control-btn {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: var(--primary);
    color: #ffffff;
}

.hero {
    padding: 8rem 0 6rem;
    text-align: center;
    background: radial-gradient(circle at top, var(--bg-card) 0%, var(--bg-main) 100%);
}

.hero-badge {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary);
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.05em;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary) 0%, #d946ef 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    max-width: 650px;
    margin: 0 auto 3rem;
    color: var(--text-muted);
    font-size: 1.2rem;
}

.btn {
    display: inline-block;
    background-color: var(--primary);
    color: #ffffff;
    text-decoration: none;
    padding: 1.2rem 2.8rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px -10px var(--primary);
}

.btn:hover {
    transform: translateY(-3px);
    background-color: var(--primary-dark);
    box-shadow: 0 15px 25px -10px var(--primary);
}

/* Bouton Secondaire (Téléchargement CV) */
.btn-outline {
    background-color: transparent;
    color: var(--text-main);
    border: 2px solid var(--text-muted);
    box-shadow: none;
}

.btn-outline:hover {
    background-color: var(--border-color);
    color: var(--primary);
    border-color: var(--primary);
    box-shadow: none;
}

.section {
    padding: 6rem 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

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

.skill-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.skill-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
}

.skill-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.skill-text {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline-item {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 3rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: var(--primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.timeline-item:hover {
    box-shadow: var(--shadow-lg);
    transform: scale(1.01);
}

.timeline-item:hover::before {
    opacity: 1;
}

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

.timeline-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
}

.timeline-date {
    background-color: var(--text-main);
    color: var(--bg-main);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.timeline-company {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.timeline-text {
    color: var(--text-muted);
    font-size: 1.05rem;
}

.footer {
    background-color: var(--bg-card);
    padding: 5rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.footer-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 2rem;
    color: var(--text-main);
}

.contact-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.contact-card {
    padding: 1rem 2rem;
    background: var(--bg-main);
    border-radius: 50px;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--border-color);
}

.contact-card:hover {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .navbar-nav { display: none; }
    .hero-title { font-size: 3rem; }
    .timeline-item { padding: 2rem; }
}