/* =========================
   BASE
========================= */

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}

.page-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 28px 20px 60px;
}


/* =========================
   EN-TÊTE DU SITE
========================= */

.site-header {
    text-align: center;
    padding: 34px 20px 22px;
}

.logo {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;

    margin-bottom: 10px;

    font-size: 34px;
    font-weight: 700;

    color: #2563eb;
    text-decoration: none;
}

.logo-icon {
    font-size: 30px;
}

.description {
    max-width: 650px;
    margin: 0 auto;

    color: #6b7280;

    font-size: 16px;
    line-height: 1.5;
}


/* =========================
   PANNEAU DE GÉNÉRATION
========================= */

.generator-panel {
    margin-bottom: 25px;

    padding: 22px;

    background: #ffffff;

    border-radius: 14px;

    box-shadow:
        0 4px 18px rgba(0, 0, 0, 0.06);
}

.generator-form {
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;

    gap: 15px;
}

.form-group {
    display: flex;
    flex: 1;
    flex-direction: column;

    min-width: 220px;

    gap: 7px;
}

.form-group label {
    color: #374151;

    font-size: 14px;
    font-weight: 700;
}


/* =========================
   LISTES DÉROULANTES
========================= */

select {
    width: 100%;

    padding: 12px 14px;

    border: 1px solid #d1d5db;
    border-radius: 9px;

    background: #ffffff;

    color: #1f2937;

    font-size: 15px;

    outline: none;

    transition:
        border-color 0.2s,
        box-shadow 0.2s;
}

select:hover {
    border-color: #9ca3af;
}

select:focus {
    border-color: #2563eb;

    box-shadow:
        0 0 0 3px rgba(37, 99, 235, 0.08);
}


/* =========================
   BOUTONS
========================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    gap: 7px;

    padding: 12px 20px;

    border: none;
    border-radius: 9px;

    font-size: 15px;
    font-weight: 700;

    cursor: pointer;

    text-decoration: none;

    transition:
        background 0.2s,
        border-color 0.2s,
        transform 0.15s,
        box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
}


/* BOUTON GÉNÉRER */

.btn-primary {
    background: #2563eb;
    color: #ffffff;

    box-shadow:
        0 3px 8px rgba(37, 99, 235, 0.18);
}

.btn-primary:hover {
    background: #1d4ed8;
}


/* BOUTON NOUVEL EXERCICE */

.btn-secondary {
    background: #f3f4f6;
    color: #1f2937;

    border: 1px solid #d1d5db;
}

.btn-secondary:hover {
    background: #e5e7eb;
    border-color: #9ca3af;
}


/* BOUTON PDF */

.btn-pdf {
    background: #111827;
    color: #ffffff;

    border: 1px solid #111827;
}

.btn-pdf:hover {
    background: #000000;
    border-color: #000000;
}

.btn-icon {
    font-size: 16px;
}


/* =========================
   CARTE DE L'EXERCICE
========================= */

.exercise-card {
    padding: 32px;

    background: #ffffff;

    border-radius: 16px;

    box-shadow:
        0 4px 20px rgba(0, 0, 0, 0.07);
}


/* =========================
   EN-TÊTE DE L'EXERCICE
========================= */

.exercise-header {
    margin-bottom: 25px;
    padding-bottom: 20px;

    border-bottom: 1px solid #e5e7eb;
}


/* BADGES */

.exercise-badges {
    display: flex;
    align-items: center;
    flex-wrap: wrap;

    gap: 8px;
}

.chapter-badge,
.level-badge {
    display: inline-flex;
    align-items: center;

    padding: 6px 11px;

    border-radius: 999px;

    font-size: 13px;
    font-weight: 700;
}

.chapter-badge {
    background: #f3f4f6;
    color: #4b5563;
}

.level-badge {
    background: #dbeafe;
    color: #1d4ed8;
}


/* TITRE */

.exercise-title {
    margin: 14px 0 0;

    color: #111827;

    font-size: 28px;
    line-height: 1.3;
}


/* =========================
   ÉNONCÉ
========================= */

.statement {
    margin-top: 0;
}

.section-heading {
    margin-bottom: 18px;
}

.section-heading h2 {
    margin: 0;

    color: #111827;

    font-size: 21px;
}

.statement-content {
    color: #1f2937;

    font-size: 17px;
    line-height: 1.8;
}


/* =========================
   BLOCS DE TEXTE
========================= */

.exercise-block {
    margin-bottom: 15px;
}

.exercise-block:last-child {
    margin-bottom: 0;
}


/* =========================
   IMAGES
========================= */

.exercise-image {
    width: 100%;

    margin: 26px 0;

    text-align: center;
}

.exercise-image img {
    display: block;

    max-width: 100% !important;
    height: auto !important;

    margin: 0 auto;

    border-radius: 8px;
}


/* =========================
   CORRECTION
========================= */

.correction-box {
    margin-top: 30px;

    overflow: hidden;

    background: #ffffff;

    border: 1px solid #dbeafe;
    border-radius: 12px;
}


/* BOUTON VOIR / MASQUER */

.correction-toggle {
    display: flex;
    align-items: center;

    width: 100%;

    gap: 9px;

    padding: 16px 18px;

    background: #eff6ff;

    color: #1d4ed8;

    font-size: 16px;
    font-weight: 700;

    cursor: pointer;

    list-style: none;
    user-select: none;

    transition: background 0.2s;
}

.correction-toggle::-webkit-details-marker {
    display: none;
}

.correction-toggle::marker {
    display: none;
    content: "";
}

.correction-toggle:hover {
    background: #dbeafe;
}


/* TEXTE OUVERT / FERMÉ */

.label-open {
    display: none;
}

.correction-box[open] .label-closed {
    display: none;
}

.correction-box[open] .label-open {
    display: inline;
}


/* FLÈCHE */

.correction-arrow {
    margin-left: auto;

    font-size: 12px;

    transition: transform 0.2s ease;
}

.correction-box[open] .correction-arrow {
    transform: rotate(180deg);
}


/* CONTENU DE LA CORRECTION */

.correction {
    padding: 24px;

    background: #f8fbff;

    border-top: 1px solid #dbeafe;
}


/* TITRE CORRECTION */

.correction-header {
    display: flex;
    align-items: center;

    gap: 10px;

    margin-bottom: 20px;
}

.correction-header-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 28px;
    height: 28px;

    flex-shrink: 0;

    background: #dcfce7;
    color: #166534;

    border-radius: 50%;

    font-weight: 700;
}

.correction-header h2 {
    margin: 0;

    color: #111827;

    font-size: 21px;
}

.correction-content {
    color: #1f2937;

    font-size: 17px;
    line-height: 1.8;
}


/* =========================
   ACTIONS DU BAS
========================= */

.exercise-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;

    gap: 12px;

    margin-top: 30px;
    padding-top: 24px;

    border-top: 1px solid #e5e7eb;
}

.exercise-actions form {
    margin: 0;
}


/* =========================
   MATHJAX
========================= */

mjx-container[jax="CHTML"] {
    max-width: 100%;

    overflow-x: auto;
    overflow-y: hidden;
}

mjx-container[jax="CHTML"][display="true"] {
    margin: 14px 0 !important;

    text-align: left !important;
}


/* =========================
   GRILLES EXISTANTES
========================= */

.grille-conversions {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 40px;

    margin-top: 20px;
}

.grille-conversions div {
    line-height: 2;
}


/* =========================
   PAGES D'INFORMATION
========================= */

.info-card {
    max-width: 820px;
    margin: 0 auto;
    padding: 34px;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07);
}

.info-card h1 {
    margin: 0 0 22px;
    color: #111827;
    font-size: 30px;
}

.info-card h2 {
    margin: 28px 0 10px;
    color: #1f2937;
    font-size: 20px;
}

.info-card p {
    margin: 0 0 16px;
    color: #374151;
    font-size: 16px;
    line-height: 1.75;
}

.notice-to-complete {
    padding: 12px 14px;
    background: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: 9px;
    color: #9a3412 !important;
    font-weight: 700;
}


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

.site-footer {
    padding: 24px 20px 32px;
    text-align: center;
    color: #6b7280;
    font-size: 14px;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin-bottom: 12px;
}

.footer-links a {
    color: #4b5563;
    text-decoration: none;
}

.footer-links a:hover {
    color: #2563eb;
    text-decoration: underline;
}

.site-footer p {
    margin: 0;
}


/* =========================
   TABLETTE
========================= */

@media (max-width: 850px) {

    .generator-form {
        align-items: stretch;
    }

    .generator-form .btn-primary {
        width: 100%;
    }
}


/* =========================
   MOBILE
========================= */

@media (max-width: 700px) {

    /* PAGE */

    .page-container {
        padding: 20px 12px 40px;
    }


    /* EN-TÊTE */

    .site-header {
        padding: 24px 15px 16px;
    }

    .logo {
        gap: 7px;

        font-size: 26px;
    }

    .logo-icon {
        font-size: 24px;
    }

    .description {
        max-width: 430px;

        font-size: 14px;
    }


    /* GÉNÉRATEUR */

    .generator-panel {
        margin-bottom: 18px;

        padding: 16px;

        border-radius: 12px;
    }

    .generator-form {
        flex-direction: column;
        align-items: stretch;

        gap: 13px;
    }

    .form-group {
        width: 100%;
        min-width: 0;
    }

    select {
        font-size: 16px;
    }


    /* BOUTONS */

    .btn {
        width: 100%;
        min-height: 46px;
    }


    /* CARTE */

    .exercise-card {
        padding: 21px 16px;

        border-radius: 13px;
    }


    /* EN-TÊTE EXERCICE */

    .exercise-header {
        margin-bottom: 22px;
        padding-bottom: 18px;
    }

    .exercise-badges {
        gap: 7px;
    }

    .chapter-badge,
    .level-badge {
        padding: 5px 9px;

        font-size: 12px;
    }

    .exercise-title {
        margin-top: 12px;

        font-size: 22px;
    }


    /* ÉNONCÉ */

    .section-heading h2 {
        font-size: 19px;
    }

    .statement-content {
        font-size: 16px;
        line-height: 1.7;
    }

    .exercise-block {
        margin-bottom: 14px;
    }


    /* IMAGES */

    .exercise-image {
        margin: 20px 0;

        overflow-x: auto;
    }

    .exercise-image img {
        max-width: 100% !important;
        height: auto !important;
    }


    /* CORRECTION */

    .correction-box {
        margin-top: 24px;
    }

    .correction-toggle {
        padding: 14px 15px;

        font-size: 15px;
    }

    .correction {
        padding: 18px 15px;
    }

    .correction-header {
        margin-bottom: 16px;
    }

    .correction-header h2 {
        font-size: 19px;
    }

    .correction-content {
        font-size: 16px;
        line-height: 1.7;
    }


    /* BOUTONS DU BAS */

    .exercise-actions {
        flex-direction: column;
        align-items: stretch;

        gap: 10px;

        margin-top: 24px;
        padding-top: 20px;
    }

    .exercise-actions form {
        width: 100%;
    }


    /* GRILLES */

    .grille-conversions {
        grid-template-columns: 1fr;

        gap: 15px;
    }


    /* FORMULES */

    mjx-container[jax="CHTML"][display="true"] {
        overflow-x: auto;
        overflow-y: hidden;
    }
}


/* =========================
   THÈME VISUEL MODERNE
========================= */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-soft: #eaf2ff;
    --violet: #7c3aed;
    --ink: #172033;
    --muted: #667085;
    --line: #e4e9f2;
    --surface: #ffffff;
}

body {
    background:
        radial-gradient(circle at 12% 4%, rgba(37, 99, 235, 0.10), transparent 28rem),
        radial-gradient(circle at 88% 8%, rgba(124, 58, 237, 0.08), transparent 26rem),
        #f6f8fc;
    color: var(--ink);
}

.site-header {
    padding-top: 42px;
}

.logo {
    color: var(--primary-dark);
    letter-spacing: -0.8px;
}

.logo-icon {
    display: inline-grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--violet), var(--primary));
    color: #fff;
    box-shadow: 0 9px 22px rgba(79, 70, 229, 0.24);
}

.generator-panel,
.exercise-card,
.info-card {
    border: 1px solid rgba(226, 232, 240, 0.9);
    box-shadow: 0 14px 40px rgba(30, 64, 175, 0.08);
}

.generator-panel {
    position: relative;
    overflow: hidden;
    padding: 26px;
}

.generator-panel::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 5px;
    background: linear-gradient(180deg, var(--violet), var(--primary));
}

.generator-intro {
    margin-bottom: 20px;
}

.generator-kicker {
    color: var(--primary);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.generator-intro h2 {
    margin: 6px 0 5px;
    color: var(--ink);
    font-size: 21px;
}

.generator-intro p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

select {
    min-height: 48px;
    border-color: var(--line);
    background-color: #fbfcff;
}

.btn-primary {
    min-height: 48px;
    background: linear-gradient(135deg, var(--violet), var(--primary));
    box-shadow: 0 9px 20px rgba(79, 70, 229, 0.22);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #6d28d9, var(--primary-dark));
    box-shadow: 0 11px 24px rgba(79, 70, 229, 0.28);
}

.exercise-card {
    border-top: 4px solid var(--primary);
}

.chapter-badge {
    background: #eef2ff;
    color: #4338ca;
}

.level-badge {
    background: #e0f2fe;
    color: #0369a1;
}

.exercise-title {
    color: var(--ink);
    letter-spacing: -0.5px;
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-number {
    display: inline-grid;
    place-items: center;
    width: 31px;
    height: 31px;
    border-radius: 9px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 800;
}

.correction-box {
    border-color: #c7d7fe;
}

.correction-toggle {
    background: linear-gradient(90deg, #eef4ff, #f5f3ff);
    color: #3346a8;
}

.correction {
    background: #fbfcff;
}

.btn-pdf {
    background: #172033;
    box-shadow: 0 7px 16px rgba(23, 32, 51, 0.16);
}

.site-footer {
    margin-top: 24px;
    border-top: 1px solid var(--line);
}

@media (max-width: 700px) {
    .site-header {
        padding-top: 26px;
    }

    .logo-icon {
        width: 39px;
        height: 39px;
        border-radius: 11px;
    }

    .generator-panel {
        padding: 20px 17px;
    }

    .generator-intro h2 {
        font-size: 18px;
    }
}


/* =========================
   PETITS TÉLÉPHONES
========================= */

@media (max-width: 420px) {

    .logo {
        font-size: 23px;
    }

    .logo-icon {
        font-size: 22px;
    }

    .description {
        font-size: 13.5px;
    }

    .exercise-card {
        padding: 18px 14px;
    }

    .exercise-title {
        font-size: 20px;
    }

    .statement-content,
    .correction-content {
        font-size: 15.5px;
    }

    .chapter-badge,
    .level-badge {
        font-size: 11.5px;
    }
}

@media (max-width: 700px) {
    .info-card {
        padding: 24px 18px;
        border-radius: 13px;
    }

    .info-card h1 {
        font-size: 25px;
    }

    .footer-links {
        gap: 9px 16px;
    }
}
.site-footer {
    margin-top: 35px;
    padding: 25px 20px;
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    color: white;
}

.footer-links a {
    color: white;
    font-weight: 600;
}

.footer-links a:hover {
    color: #dbeafe;
}

.site-footer p {
    color: #dbeafe;
}