/* =========================================
   DOMAINE INFORMATIQUE & NUMÉRIQUE
   ========================================= */

:root {
    --white: #ffffff;
    --dark-navy: #172033;
    --accent-orange: #f28c28;
}

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

body {
    font-family: "Poppins", sans-serif;
    background: #f7f8fa;
    color: #172033;
    line-height: 1.6;
}

/* =========================================
   BARRE DES RÉSEAUX SOCIAUX
   ========================================= */

.top-bar {
    background-color: #151828;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    position: sticky;
    top: 0;
    z-index: 1001;
}

.top-bar-content {
    width: 95%;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.social-links {
    display: flex;
    align-items: center;
}

.social-links a {
    color: #ffffff;
    margin-left: 15px;
    font-size: 0.9rem;
    transition: color 0.3s ease;
    text-decoration: none;
}

.social-links a:hover {
    color: #ff6b00;
}

/* Suppression d'un éventuel tiret automatique */
.social-links a::after {
    content: none !important;
}

/* =========================================
   EN-TÊTE
   ========================================= */

.container {
    width: 95%;
    max-width: 1400px;
    margin: 0 auto;
}

.main-header {
    background-color: var(--white);
    padding: 18px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 36px;
    z-index: 1000;
}

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

.logo {
    text-decoration: none;
    font-size: 1.7rem;
    font-weight: 1000;
}

.logo-bold {
    color: #ff6b00;
}

.logo-orange {
    color: #111111;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

.main-nav a {
    text-decoration: none;
    color: #111111;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.main-nav a.active,
.main-nav a:hover {
    color: var(--accent-orange);
    border-bottom: 2px solid var(--accent-orange);
    padding-bottom: 4px;
}

/* =========================================
   INTRODUCTION DU DOMAINE
   ========================================= */

.domain-intro {
    background: #172033;
    color: white;
    text-align: center;
    padding: 70px 25px 65px;
}

.domain-number {
    display: inline-block;
    background: #f28c28;
    padding: 7px 18px;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.domain-intro h1 {
    font-size: 42px;
    line-height: 1.15;
    margin-bottom: 20px;
}

.domain-intro h1 span {
    color: #f28c28;
}

.intro-lead {
    max-width: 800px;
    margin: auto;
    color: #e5e7eb;
    font-size: 19px;
}


/* =========================================
   SECTIONS D'INFORMATION
   ========================================= */

.info-section {
    max-width: 1050px;
    margin: 0 auto;
    padding: 55px 25px;
}

.info-section h2 {
    font-size: 25px;
    margin-bottom: 22px;
    color: #172033;
}

.info-section h2 i {
    color: #f28c28;
    margin-right: 8px;
}

.info-section p {
    color: #4b5563;
    margin-bottom: 16px;
}


/* =========================================
   BLOCS IMPORTANTS
   ========================================= */

.important-box {
    margin-top: 25px;
    padding: 25px 28px;
    background: #fff4e5;
    border-left: 5px solid #f28c28;
    border-radius: 8px;
}

.important-box strong {
    display: block;
    color: #172033;
    margin-bottom: 8px;
}

.important-box p {
    margin-bottom: 8px;
}


/* =========================================
   ACTIONS DE L'INGÉNIEUR
   ========================================= */

.actions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 28px;
}

.action-card {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 22px 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
}

.action-card i {
    color: #f28c28;
    font-size: 25px;
}

.action-card span {
    font-weight: 600;
    font-size: 14px;
}


/* =========================================
   QUESTION CENTRALE
   ========================================= */

.question-box {
    margin-top: 30px;
    padding: 28px;
    background: #172033;
    color: white;
    border-radius: 10px;
    text-align: center;
}

.question-box p {
    color: white;
    margin-bottom: 8px;
}

.question-box p:first-child {
    color: #f28c28;
}


/* =========================================
   PROBLÈMES
   ========================================= */

.problem-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 30px;
    margin-top: 25px;
}

.problem-list div {
    background: white;
    border: 1px solid #e5e7eb;
    padding: 14px 18px;
    border-radius: 8px;
    font-size: 14px;
}

.problem-list i {
    color: #f28c28;
    margin-right: 8px;
}


/* =========================================
   SYSTÈMES
   ========================================= */

.systems-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    margin-top: 25px;
}

.systems-grid div {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 15px 10px;
    text-align: center;
    font-size: 13px;
    font-weight: 600;
}


/* =========================================
   SECTEURS
   ========================================= */

.sectors {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 25px 0;
}

.sectors span {
    background: #172033;
    color: white;
    padding: 9px 16px;
    border-radius: 20px;
    font-size: 13px;
}


/* =========================================
   SPÉCIALITÉS
   ========================================= */

.specialties {
    background: #eef1f5;
    padding: 70px 25px 80px;
}

.section-title {
    max-width: 850px;
    margin: 0 auto 40px;
    text-align: center;
}

.small-title {
    color: #f28c28;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.section-title h2 {
    font-size: 30px;
    color: #172033;
    margin-bottom: 12px;
}

.section-title p {
    color: #5b6472;
}


/* =========================================
   CARTES DES 12 SPÉCIALITÉS
   ========================================= */

.specialties-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.specialty-card {
    position: relative;
    background: white;
    border: 1px solid #e1e5ea;
    border-radius: 12px;
    padding: 28px 24px;
    min-height: 255px;
    text-decoration: none;
    color: #172033;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease,
                box-shadow 0.2s ease,
                border-color 0.2s ease;
}

.specialty-card:hover {
    transform: translateY(-5px);
    border-color: #f28c28;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.09);
}

.specialty-number {
    color: #f28c28;
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 12px;
}

.specialty-card h3 {
    font-size: 17px;
    line-height: 1.35;
    margin-bottom: 12px;
}

.specialty-card p {
    color: #5b6472;
    font-size: 13px;
    margin-bottom: 20px;
}

.specialty-card span {
    margin-top: auto;
    color: #f28c28;
    font-size: 13px;
    font-weight: 700;
}

.specialty-card span i {
    margin-left: 5px;
    transition: transform 0.2s ease;
}

.specialty-card:hover span i {
    transform: translateX(4px);
}


/* =========================================
   SPÉCIALITÉ COMPLÉMENTAIRE (BI)
   ========================================= */

.complementary-title {
    max-width: 1200px;
    margin: 45px auto 22px;
    text-align: center;
}

.complementary-title p {
    display: inline-block;
    color: #9a7a55;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding-bottom: 6px;
    border-bottom: 2px dashed #f28c28;
}

.specialties-grid--single {
    grid-template-columns: minmax(0, 420px);
    justify-content: center;
}

.specialty-card--complementary {
    border-style: dashed;
    border-color: #f2c896;
    background: #fffaf3;
}

.specialty-card--complementary:hover {
    border-style: solid;
    border-color: #f28c28;
}

.specialty-number--badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: #f28c28;
    color: white;
    border-radius: 50%;
    font-size: 14px;
}


/* =========================================
   RETOUR
   ========================================= */





.back-link { text-align: center; margin: 40px 0; }
.back-link a { display: inline-block; background: var(--dark-navy); color: #fff; padding: 12px 28px; border-radius: 30px; font-weight: 500; }
.back-link a:hover { background: var(--accent-orange); }

/* =========================================
   PIED DE PAGE
   ========================================= */

footer {
    background: #111827;
    color: #cbd5e1;
    text-align: center;
    padding: 25px;
    font-size: 13px;
}


/* =========================================
   RESPONSIVE
   ========================================= */

@media (max-width: 1000px) {

    .header {
        flex-direction: column;
        padding: 20px;
    }

    .navigation {
        justify-content: center;
    }

    .specialties-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .systems-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}


@media (max-width: 700px) {

    .domain-intro h1 {
        font-size: 32px;
    }

    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .problem-list {
        grid-template-columns: 1fr;
    }

    .specialties-grid {
        grid-template-columns: 1fr;
    }

    .systems-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


@media (max-width: 480px) {

    .actions-grid {
        grid-template-columns: 1fr;
    }

    .systems-grid {
        grid-template-columns: 1fr;
    }

    .domain-intro h1 {
        font-size: 28px;
    }

    .info-section {
        padding-left: 20px;
        padding-right: 20px;
    }
}