:root {
    --primary: #1a3a5a; /* Bleu profond professionnel */
    --accent: #d4af37;  /* Touche dorée/institutionnelle */
    --light: #f4f7f6;
    --dark: #222;
}

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

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: var(--dark);
    scroll-behavior: smooth;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
}

/* Header */
header {
    background: #fff;
    padding: 20px 0;
    border-bottom: 2px solid var(--light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.logo span { color: var(--accent); }

nav ul { display: flex; list-style: none; }
nav ul li { margin-left: 25px; }
nav ul li a { 
    text-decoration: none; 
    color: var(--dark); 
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
}

/* Hero */
.hero {
    height: 60vh;
    background: url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?auto=format&fit=crop&w=1500&q=80') center/cover;
    display: flex;
    align-items: center;
    color: white;
}

.overlay {
    background: rgba(26, 58, 90, 0.7);
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
}

.hero-text {
    max-width: 800px;
    margin-left: 10%;
    padding: 20px;
}

.hero-text h1 { font-size: 3rem; margin-bottom: 10px; }

/* Sections */
.content-section, .contact-section { padding: 80px 0; }
h2 { font-size: 2.2rem; text-align: center; color: var(--primary); }
hr { width: 50px; height: 3px; background: var(--accent); border: none; margin: 20px auto 40px; }

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 40px;
}

.info-card {
    background: var(--light);
    padding: 30px;
    border-radius: 4px;
    border-left: 5px solid var(--primary);
}

/* Formulaire & Contact */
.contact-flex {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h3 { margin: 20px 0 10px; color: var(--primary); }

.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.btn {
    background: var(--primary);
    color: white;
    padding: 12px 30px;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    font-weight: bold;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: #999;
    padding: 40px 0;
    font-size: 0.85rem;
    text-align: center;
}

footer strong { color: #fff; }
.copyright { margin-top: 20px; border-top: 1px solid #333; padding-top: 20px; }