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

/* =========================
   BODY
========================= */
body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f5f7fa;
    color: #1f2937;
    line-height: 1.7;
    padding: 40px 20px;
}

/* =========================
   CONTAINER
========================= */
section {
    max-width: 900px;
    margin: 0 auto;
    background: #ffffff;
    padding: 50px;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

/* =========================
   HEADER
========================= */
header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 3rem;
    color: #111827;
    margin-bottom: 10px;
}

/* =========================
   TITRES
========================= */
h2 {
    margin-top: 35px;
    margin-bottom: 15px;
    color: #2563eb;
    font-size: 1.5rem;
    border-left: 5px solid #2563eb;
    padding-left: 12px;
}

/* =========================
   TEXTES
========================= */
p {
    margin-bottom: 20px;
    font-size: 1rem;
    color: #374151;
}

/* =========================
   LISTES
========================= */
ul {
    margin: 10px 0 20px 20px;
}

li {
    margin-bottom: 8px;
    color: #374151;
}

/* =========================
   LIEN RETOUR
========================= */
.back-link {
    display: inline-block;
    margin: 40px auto 0;
    text-align: center;
    text-decoration: none;
    color: white;
    background-color: #2563eb;
    padding: 14px 24px;
    border-radius: 10px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.back-link:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
}

/* =========================
   RESPONSIVE TABLET
========================= */
@media (max-width: 768px) {

    body {
        padding: 20px 15px;
    }

    section {
        padding: 30px 25px;
    }

    header h1 {
        font-size: 2.2rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    p, li {
        font-size: 0.95rem;
    }
}

/* =========================
   RESPONSIVE MOBILE
========================= */
@media (max-width: 480px) {

    body {
        padding: 15px 10px;
    }

    section {
        padding: 25px 18px;
        border-radius: 14px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.1rem;
        padding-left: 10px;
    }

    p, li {
        font-size: 0.92rem;
        line-height: 1.6;
    }

    .back-link {
        width: 100%;
        text-align: center;
        padding: 14px;
    }
}