/* Styles globaux (Police système & ergonomie mobile) */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f8fafc;
    color: #1e293b;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* En-tête fixe et minimaliste */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: #0284c7;
    letter-spacing: -0.025em;
}

.logo span {
    color: #0f172a;
}

/* Conteneur principal adapté aux écrans mobiles */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 24px 16px;
}

/* Section d'introduction */
.about-hero {
    margin-bottom: 24px;
    text-align: left;
}

.about-hero h1 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #64748b;
    margin-bottom: 6px;
    font-weight: 600;
}

.about-hero h2 {
    font-size: 1.45rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 12px;
    line-height: 1.3;
}

.lead {
    font-size: 1rem;
    color: #334155;
    font-weight: 400;
}

/* Cartes de contenu épurées */
.about-card {
    background: #ffffff;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    border: 1px solid #f1f5f9;
}

.about-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #0f172a;
    margin-bottom: 8px;
}

.about-card p {
    font-size: 0.93rem;
    color: #475569;
    margin: 0;
}

/* Bandeau de fin (Callout Box) */
.callout-box {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 12px;
    padding: 20px;
    margin-top: 24px;
    margin-bottom: 40px;
    text-align: center;
}

.callout-box h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #0369a1;
    margin-bottom: 8px;
}

.callout-box p {
    font-size: 0.9rem;
    color: #334155;
    margin: 0;
}