:root {
    --bg-color: #0b0f19;
    --surface-color: rgba(30, 41, 59, 0.5);
    --surface-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-color: #3b82f6;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --gradient-glow: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3 {
    font-family: var(--font-heading);
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
}

h1 span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

h2 {
    font-size: clamp(2rem, 3vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

/* Utilities */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    border-radius: 999px;
    font-weight: 600;
    font-family: var(--font-heading);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--surface-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--surface-color);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-glow {
    background: var(--gradient-glow);
    color: white;
    border: none;
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
}

.btn-glow:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.6);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.25rem 0;
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--surface-border);
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 3rem; /* un peu plus de marge pour que ça ne colle pas complètement au bord */
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
    display: block;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
}

.btn-contact {
    background: var(--surface-color);
    padding: 0.6rem 1.25rem !important;
    border-radius: 999px;
    border: 1px solid var(--surface-border);
    color: var(--text-primary) !important;
}

.btn-contact:hover {
    background: var(--gradient-primary);
    border-color: transparent;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    padding: 8rem 2rem 4rem;
    display: flex;
    align-items: center;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

/* Background Glow Effects */
.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: var(--primary-color);
    filter: blur(150px);
    opacity: 0.15;
    z-index: -1;
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 10%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: var(--secondary-color);
    filter: blur(150px);
    opacity: 0.15;
    z-index: -1;
    border-radius: 50%;
}

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

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2.5rem;
}

.glass-card {
    position: relative;
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 24px;
    padding: 1rem;
    backdrop-filter: blur(20px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.glass-card img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    display: block;
    object-fit: cover;
    aspect-ratio: 4/5;
}

.hero-logo-img {
    aspect-ratio: auto;
    object-fit: contain;
    max-height: 400px;
    width: 100%;
    margin: 0 auto;
    display: block;
}

.floating-badge {
    position: absolute;
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid var(--surface-border);
    border-radius: 16px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    animation: float 6s ease-in-out infinite;
}

.floating-badge .icon {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.badge-text strong {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.badge-text span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.badge-1 {
    top: 10%;
    left: -15%;
    animation-delay: 0s;
}

.badge-2 {
    bottom: 15%;
    right: -10%;
    animation-delay: 3s;
}

/* Services */
.services {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 24px;
    padding: 2.5rem;
    transition: all 0.4s ease;
    backdrop-filter: blur(10px);
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    background: rgba(30, 41, 59, 0.8);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
}

.math-icon { background: rgba(59, 130, 246, 0.1); }
.science-icon { background: rgba(139, 92, 246, 0.1); }
.method-icon { background: rgba(6, 182, 212, 0.1); }

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

.service-card p {
    font-size: 1rem;
    margin-bottom: 0;
}

/* CTA Section */
.cta-section {
    padding: 6rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.cta-container {
    background: var(--gradient-primary);
    border-radius: 32px;
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><path fill="rgba(255,255,255,0.05)" d="M0 0h100v100H0z"/></svg>');
    opacity: 0.5;
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    color: white;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
}

/* Footer */
.footer {
    border-top: 1px solid var(--surface-border);
    padding: 4rem 2rem 2rem;
    background: rgba(11, 15, 25, 0.95);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand p {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

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

.animate-fade-in-up {
    animation: fadeInUp 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.animate-fade-in {
    opacity: 0;
    animation: fadeInUp 1s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }

    .hero-text {
        order: 1;
    }

    .hero-image {
        order: 2;
        max-width: 500px;
        margin: 0 auto;
    }

    .floating-badge {
        transform: scale(0.8);
    }

    .badge-1 { left: -5%; }
    .badge-2 { right: -5%; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple mobile behavior */
    }

    h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-brand {
        margin: 0 auto;
    }
    
    .footer-links {
        width: 100%;
        justify-content: center;
    }
}