*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Montserrat", sans-serif;
    background: #F4F6F6;
    color: #1E335C;
    overflow-x: hidden;
}

a {
    color: #1E335C;
}

h1, h2, h3 {
    margin: 0;
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fade 1.2s forwards;
}
@keyframes fade {
    to { opacity: 1; }
}
.slide-up {
    transform: translateY(20px);
    opacity: 0;
    animation: up 1s forwards;
}
@keyframes up {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Header */
header {
    background: #1E335C;
    color: white;
    text-align: center;
    padding: 90px 20px;
}
header img {
    max-width: 140px;
    margin-bottom: 25px;
    animation: fade 1.4s ease-out forwards;
}
header h1 {
    font-size: 42px;
    font-weight: 600;
    letter-spacing: 2px;
}
header p {
    margin-top: 10px;
    font-size: 20px;
    opacity: 0.9;
}

.cta {
    display: inline-block;
    margin-top: 30px;
    padding: 14px 30px;
    background: white;
    color: #1E335C;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    transition: 0.3s;
    border: none;
}
.cta:hover {
    background: #F7F7F7;
    transform: translateY(-2px);
}

/* Sections */
section {
    max-width: 900px;
    background: white;
    margin: 50px auto;
    padding: 50px 40px;
    border-radius: 10px;
}

h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

p {
    line-height: 1.6;
}

/* Skills */
.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.skills span {
    display: inline-block;
    background: #E8ECEF;
    padding: 8px 14px;
    border-radius: 4px;
    font-size: 14px;
}

/* Offre */
.offer-block {
    background: #5A8C87;
    color: white;
    padding: 30px;
    border-radius: 8px;
    margin-top: 25px;
}
.offer-block h3 {
    margin-top: 15px;
    margin-bottom: 8px;
    font-size: 20px;
}
.offer-block p {
    margin: 0;
    font-size: 15px;
}

/* Steps */
.steps {
    margin-top: 20px;
}
.step {
    margin-bottom: 15px;
    padding-left: 10px;
    border-left: 4px solid #1E335C;
    font-size: 15px;
}

/* Clients */
.clients-logos {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.client-card {
    background: #F4F6F6;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    font-size: 14px;
}
.client-title {
    font-weight: 600;
    margin-bottom: 5px;
}
.client-tag {
    font-size: 12px;
    opacity: 0.8;
}

footer {
    text-align: center;
    padding: 20px;
    color: #1E335C;
    font-size: 14px;
    margin-top: 50px;
}

/* Responsive tablette */
@media (max-width: 992px) {
    header {
        padding: 70px 20px;
    }
    header h1 {
        font-size: 34px;
    }
    header p {
        font-size: 18px;
    }
    section {
        margin: 35px 15px;
        padding: 35px 25px;
    }
    .clients-logos {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Responsive mobile */
@media (max-width: 600px) {
    header {
        padding: 60px 15px;
    }
    header img {
        max-width: 110px;
        margin-bottom: 18px;
    }
    header h1 {
        font-size: 28px;
        letter-spacing: 1.5px;
    }
    header p {
        font-size: 16px;
    }
    .cta {
        width: 100%;
        max-width: 260px;
        padding: 12px 0;
    }
    section {
        margin: 25px 10px;
        padding: 25px 18px;
        border-radius: 8px;
    }
    h2 {
        font-size: 22px;
    }
    .offer-block {
        padding: 20px 15px;
    }
    .offer-block h3 {
        font-size: 18px;
    }
    .skills {
        gap: 6px;
    }
    .skills span {
        font-size: 13px;
        padding: 6px 10px;
    }
    .step {
        font-size: 14px;
    }
    .clients-logos {
        grid-template-columns: 1fr;
    }
}