/* =========================================================
   OSC Plomberie — style.css
   Feuille unique, mobile-first, sans framework.
   ========================================================= */

:root {
    --color-primary: #1E8A4C;
    --color-primary-dark: #166A3A;
    --color-accent: #F5C518;
    --color-light: #F7F9F8;
    --color-gray: #E4E8E6;
    --color-text: #1B1F1D;
    --color-text-muted: #5B6560;
    --radius: 10px;
    --shadow: 0 2px 10px rgba(20, 30, 25, 0.06);
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --container-width: 1140px;
}

/* --- Reset minimal --- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--font-base);
    color: var(--color-text);
    background: #fff;
    line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .6em; }
p { margin: 0 0 1em; }
button { font-family: inherit; cursor: pointer; }

.sr-only {
    position: absolute; width: 1px; height: 1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}
.skip-link {
    position: absolute; left: -9999px; top: 0;
    background: var(--color-primary); color: #fff; padding: .6em 1em; z-index: 1000;
}
.skip-link:focus { left: 0; }

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem;
}

/* --- Boutons --- */
.btn {
    display: inline-block;
    padding: .7em 1.4em;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
}
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn--accent { background: var(--color-accent); color: var(--color-text); }
.btn--accent:hover { text-decoration: none; opacity: .9; }

/* --- Header --- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: #fff;
    border-bottom: 1px solid var(--color-gray);
}
.site-header__inner {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: .6rem; padding-bottom: .6rem; gap: 1rem;
}
.site-nav ul { display: none; }
.site-header__actions { display: flex; align-items: center; gap: .6rem; }
.site-search { display: none; }
.btn-phone {
    background: var(--color-primary); color: #fff;
    padding: .5em .9em; border-radius: var(--radius); font-weight: 600; font-size: .9rem;
    white-space: nowrap;
}
.btn-phone:hover { text-decoration: none; background: var(--color-primary-dark); }

.menu-toggle {
    background: none; border: none; padding: .4rem;
    display: flex; flex-direction: column; gap: 4px;
}
.menu-toggle span { width: 22px; height: 2px; background: var(--color-text); display: block; }

/* --- Hero --- */
.hero { background: var(--color-light); padding: 2.5rem 0; }
.hero__inner { display: flex; flex-direction: column; gap: 1.5rem; }
.hero__text h1 { font-size: 1.7rem; }
.hero__text p { color: var(--color-text-muted); }

/* --- Sections --- */
.section { padding: 2.5rem 0; }
.section--alt { background: var(--color-light); }
.section__title { font-size: 1.4rem; margin-bottom: 1.2rem; }

/* --- Grilles --- */
.grid { display: grid; gap: 1.2rem; }
.grid--articles { grid-template-columns: 1fr; }
.grid--categories { grid-template-columns: repeat(2, 1fr); }

/* --- Cartes --- */
.card {
    background: #fff; border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.card__image img { width: 100%; aspect-ratio: 4/2.6; object-fit: cover; }
.card__body { padding: 1rem; }
.card__category {
    display: inline-block; font-size: .75rem; text-transform: uppercase;
    color: var(--color-primary); font-weight: 700; margin-bottom: .4em;
}
.card__meta { font-size: .85rem; color: var(--color-text-muted); margin-top: .6em; }
.card--featured { flex-direction: column; }

.category-card {
    position: relative; border-radius: var(--radius); overflow: hidden; color: #fff;
}
.category-card img { aspect-ratio: 3/2; object-fit: cover; }
.category-card span {
    position: absolute; bottom: 0; left: 0; right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,.6));
    padding: 1.5rem .8rem .6rem; font-weight: 700;
}

/* --- CTA --- */
.cta { background: var(--color-primary); color: #fff; text-align: center; }
.cta__inner h2 { margin-bottom: .3em; }

/* --- Breadcrumb --- */
.breadcrumb { margin: 1rem 0; font-size: .85rem; color: var(--color-text-muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: .3em; }
.breadcrumb li:not(:last-child)::after { content: "/"; margin-left: .3em; }

/* --- Article --- */
.article { max-width: 780px; padding-top: 1rem; padding-bottom: 3rem; }
.article__header h1 { font-size: 1.6rem; }
.article__resume { color: var(--color-text-muted); font-size: 1.05rem; }
.article__meta { font-size: .85rem; color: var(--color-text-muted); margin-bottom: 1.2rem; }
.article__image { border-radius: var(--radius); margin-bottom: 1.5rem; }
.article__toc {
    background: var(--color-light); border-radius: var(--radius);
    padding: 1rem 1.2rem; margin-bottom: 1.5rem;
}
.article__toc h2 { font-size: 1rem; margin-bottom: .5em; }
.article__toc ol { padding-left: 1.2rem; list-style: decimal; }
.article__content h2 { font-size: 1.3rem; margin-top: 1.6em; }
.article__content h3 { font-size: 1.1rem; margin-top: 1.3em; }
.related-articles { margin-top: 2.5rem; }
.related-articles h2 { font-size: 1.2rem; margin-bottom: 1rem; }
.category-cta { margin-top: 2rem; font-weight: 600; }

/* --- Catégorie / statique / recherche --- */
.category-page, .static-page, .search-page, .contact-page, .error-page {
    padding: 1rem 0 3rem;
}
.category-page__header p { color: var(--color-text-muted); }
.category-page__seo-text { margin-top: 2rem; color: var(--color-text-muted); font-size: .9rem; }

/* --- Formulaire contact --- */
.contact-form { display: flex; flex-direction: column; gap: .3rem; max-width: 520px; }
.contact-form label { font-weight: 600; margin-top: .6rem; }
.contact-form input, .contact-form textarea {
    padding: .6em; border: 1px solid var(--color-gray); border-radius: var(--radius);
    font-family: inherit; font-size: 1rem;
}
.contact-form button { margin-top: 1rem; align-self: flex-start; border: none; }
.alert { padding: .8em 1em; border-radius: var(--radius); margin-bottom: 1rem; }
.alert--success { background: #E4F5EA; color: var(--color-primary-dark); }
.alert--error { background: #FDECEC; color: #9C2B2B; }

/* --- Footer --- */
.site-footer { background: var(--color-light); margin-top: 2rem; }
.site-footer__inner {
    display: grid; grid-template-columns: 1fr; gap: 1.8rem;
    padding: 2.5rem 1rem;
}
.site-footer__block h2 { font-size: 1rem; margin-bottom: .6em; }
.site-footer__block ul li { margin-bottom: .4em; }
.site-footer__bottom {
    border-top: 1px solid var(--color-gray);
    padding: 1rem; text-align: center; font-size: .85rem; color: var(--color-text-muted);
}

/* =========================================================
   Tablette
   ========================================================= */
@media (min-width: 640px) {
    .grid--articles { grid-template-columns: repeat(2, 1fr); }
    .grid--categories { grid-template-columns: repeat(3, 1fr); }
    .site-footer__inner { grid-template-columns: repeat(2, 1fr); }
}

/* =========================================================
   Ordinateur
   ========================================================= */
@media (min-width: 960px) {
    .site-nav ul { display: flex; gap: 1.4rem; }
    .site-nav a { font-weight: 600; color: var(--color-text); }
    .site-search { display: flex; align-items: center; gap: .3rem; background: var(--color-light); border-radius: var(--radius); padding: .3em .6em; }
    .site-search input { border: none; background: none; outline: none; font-size: .9rem; width: 140px; }
    .site-search button { background: none; border: none; }
    .menu-toggle { display: none; }

    .hero__inner { flex-direction: row; align-items: center; }
    .hero__text { flex: 1; }
    .hero__image { flex: 1; }
    .hero__text h1 { font-size: 2.2rem; }

    .grid--articles { grid-template-columns: repeat(3, 1fr); }
    .grid--categories { grid-template-columns: repeat(6, 1fr); }
    .site-footer__inner { grid-template-columns: repeat(4, 1fr); }

    .card--featured { flex-direction: row; }
    .card--featured .card__image { flex: 1; }
    .card--featured .card__body { flex: 1; display: flex; flex-direction: column; justify-content: center; }
}

/* --- Menu mobile ouvert (géré en JS via classe) --- */
.site-nav.is-open ul {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--color-gray);
    padding: 1rem; gap: .8rem;
}