/* =========================================================
   Institut des Politiques Locales — feuille de style
   Direction : institutionnel sobre (blanc, sérif, bleu/rouge)
   ========================================================= */

:root {
  --bleu:        #1d6fb3;
  --bleu-fonce:  #14517f;
  --rouge:       #df3122;
  --encre:       #16202b;
  --encre-doux:  #2c3a47;
  --gris:        #5d6b78;
  --gris-clair:  #eef2f5;
  --gris-ligne:  #e2e8ed;
  --fond:        #ffffff;
  --fond-alt:    #f7f9fb;
  --footer:      #16202b;

  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --wrap: 1140px;
  --radius: 4px;
  --transition: 180ms ease;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--encre);
  background: var(--fond);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--bleu); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--bleu-fonce); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--encre);
  line-height: 1.2;
  font-weight: 600;
  margin: 0 0 .5em;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--encre); color: #fff; padding: 10px 16px; z-index: 200;
}
.skip-link:focus { left: 12px; top: 12px; color: #fff; }

/* ---------- En-tête / navigation ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.94);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--gris-ligne);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 84px; gap: 24px;
}
.logo img { height: 50px; width: auto; }

.site-nav { display: flex; gap: 6px; align-items: center; }
.site-nav a {
  font-family: var(--sans);
  font-weight: 500;
  color: var(--encre-doux);
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 15.5px;
  position: relative;
}
.site-nav a:hover { color: var(--bleu); background: var(--gris-clair); }
.site-nav a.is-active { color: var(--bleu); }
.site-nav a.is-active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 2px; background: var(--bleu);
}

.nav-toggle, .nav-burger { display: none; }
.nav-burger { cursor: pointer; padding: 10px; }
.nav-burger span {
  display: block; width: 24px; height: 2px; background: var(--encre);
  margin: 5px 0; transition: var(--transition);
}

/* ---------- Boutons ---------- */
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15.5px;
  padding: 13px 26px;
  border-radius: var(--radius);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary { background: var(--bleu); color: #fff; }
.btn-primary:hover { background: var(--bleu-fonce); color: #fff; }
.btn-ghost { background: transparent; color: var(--encre); border-color: var(--gris-ligne); }
.btn-ghost:hover { border-color: var(--bleu); color: var(--bleu); }

/* ---------- Hero ---------- */
.hero {
  background: var(--fond-alt);
  border-bottom: 1px solid var(--gris-ligne);
  padding: 92px 0 84px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--bleu) 0 50%, var(--rouge) 50% 100%);
}
.hero-inner { max-width: 760px; }
.hero .kicker {
  text-transform: uppercase; letter-spacing: .14em; font-size: 13px;
  font-weight: 600; color: var(--bleu); margin-bottom: 18px;
}
.hero h1 { font-size: clamp(2rem, 4vw, 3.1rem); margin-bottom: .4em; }
.hero p { font-size: 1.22rem; color: var(--encre-doux); margin: 0 0 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Sections ---------- */
.section { padding: 76px 0; }
.section-alt { background: var(--fond-alt); border-top: 1px solid var(--gris-ligne); border-bottom: 1px solid var(--gris-ligne); }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head .kicker {
  text-transform: uppercase; letter-spacing: .14em; font-size: 12.5px;
  font-weight: 600; color: var(--rouge); margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
.section-head p { color: var(--gris); font-size: 1.08rem; margin: .4em 0 0; }

/* ---------- Piliers (3 colonnes) ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.pilier {
  padding: 30px; background: var(--fond); border: 1px solid var(--gris-ligne);
  border-radius: var(--radius);
}
.pilier .num {
  font-family: var(--serif); font-size: 1.4rem; color: var(--bleu);
  border-bottom: 2px solid var(--rouge); display: inline-block; padding-bottom: 4px; margin-bottom: 14px;
}
.pilier h3 { font-size: 1.25rem; }
.pilier p { color: var(--gris); margin: 0; font-size: .98rem; }

/* ---------- Cartes articles ---------- */
.articles-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 32px;
}
.card {
  display: flex; flex-direction: column;
  background: var(--fond); border: 1px solid var(--gris-ligne);
  border-radius: var(--radius); overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(22,32,43,.10); }
.card-cover {
  aspect-ratio: 16 / 9; background: var(--gris-clair);
  display: flex; align-items: flex-end; padding: 18px;
  position: relative; overflow: hidden;
}
.card-cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.card-cover.placeholder {
  background:
    radial-gradient(circle at 80% 15%, rgba(255,255,255,.18), transparent 55%),
    linear-gradient(135deg, var(--bleu-fonce), var(--bleu));
}
.card-cover.placeholder.t-environnement { background: linear-gradient(135deg,#1c6b4f,#2f9e74); }
.card-cover.placeholder.t-territoires  { background: linear-gradient(135deg,#5a3f7a,#8a63b8); }
.card-cover .cover-sigle {
  font-family: var(--serif); font-style: italic; color: rgba(255,255,255,.92);
  font-size: 2.4rem; line-height: 1; position: relative; z-index: 1;
}
.card-body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.badge {
  align-self: flex-start;
  font-size: 12px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--bleu); background: var(--gris-clair);
  padding: 4px 10px; border-radius: 20px; margin-bottom: 14px;
}
.card-body h3 { font-size: 1.28rem; margin-bottom: 10px; }
.card-body h3 a { color: var(--encre); }
.card-body h3 a:hover { color: var(--bleu); }
.card-chapeau { color: var(--gris); font-size: .97rem; margin: 0 0 18px; flex: 1; }
.card-meta { display: flex; justify-content: flex-end; align-items: center; font-size: .85rem; color: var(--gris); }
.card-meta .lire { font-weight: 600; color: var(--bleu); }

/* ---------- Filtres thèmes ---------- */
.filtres { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }
.filtres a {
  font-size: 14px; font-weight: 500; padding: 8px 16px; border-radius: 20px;
  border: 1px solid var(--gris-ligne); color: var(--encre-doux);
}
.filtres a:hover { border-color: var(--bleu); color: var(--bleu); }
.filtres a.is-active { background: var(--encre); color: #fff; border-color: var(--encre); }

/* ---------- Page institut (contenu riche) ---------- */
.page-head { padding: 70px 0 40px; border-bottom: 1px solid var(--gris-ligne); }
.page-head::before {
  content: ""; display: block; width: 56px; height: 4px;
  background: linear-gradient(90deg, var(--bleu) 0 50%, var(--rouge) 50%); margin-bottom: 22px;
}
.page-head h1 { font-size: clamp(2rem, 3.6vw, 2.8rem); max-width: 16ch; }
.page-head .lede { font-size: 1.2rem; color: var(--encre-doux); max-width: 60ch; margin: .6em 0 0; }

.prose { max-width: 720px; margin: 0 auto; }
.prose.large { font-size: 1.05rem; }
.prose h2 { font-size: 1.6rem; margin: 1.8em 0 .5em; padding-top: .3em; }
.prose h2::before {
  content: ""; display: block; width: 38px; height: 3px; background: var(--rouge); margin-bottom: .55em;
}
.prose h3 { font-size: 1.3rem; margin: 1.5em 0 .4em; }
.prose p { margin: 0 0 1.25em; }
.prose ul, .prose ol { margin: 0 0 1.25em; padding-left: 1.3em; }
.prose li { margin-bottom: .5em; }
.prose blockquote {
  border-left: 3px solid var(--bleu); margin: 1.5em 0; padding: .3em 0 .3em 1.3em;
  color: var(--encre-doux); font-style: italic;
}
.prose em { color: var(--encre-doux); }
.prose strong { color: var(--encre); }

/* ---------- Bloc fondateurs / valeurs ---------- */
.value-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; margin: 0; padding: 0; list-style: none; }
.value-list li {
  background: var(--fond); border: 1px solid var(--gris-ligne); border-radius: var(--radius);
  padding: 24px; margin: 0;
}
.value-list h3 { font-size: 1.15rem; margin-bottom: .4em; }
.value-list p { color: var(--gris); font-size: .96rem; margin: 0; }

/* ---------- Article ---------- */
.article-hero { padding: 64px 0 30px; }
.article-hero .badge { margin-bottom: 18px; }
.article-hero h1 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); max-width: 24ch; }
.article-hero .article-meta { color: var(--gris); font-size: .95rem; margin-top: 14px; }
.article-chapeau {
  font-family: var(--serif); font-size: 1.3rem; line-height: 1.5; color: var(--encre-doux);
  max-width: 720px; margin: 0 auto; padding: 8px 0 36px; border-bottom: 1px solid var(--gris-ligne);
}
.article-cover { margin: 0 0 40px; }
.article-cover img { width: 100%; border-radius: var(--radius); }
.article-body { padding-top: 40px; padding-bottom: 30px; }
.article-foot {
  max-width: 720px; margin: 40px auto 0; padding-top: 28px; border-top: 1px solid var(--gris-ligne);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}

/* ---------- Formulaire contact ---------- */
.form-grid { max-width: 680px; }
.field { margin-bottom: 22px; }
.field label { display: block; font-weight: 600; font-size: 14.5px; margin-bottom: 7px; }
.field input, .field textarea {
  width: 100%; font-family: var(--sans); font-size: 16px; color: var(--encre);
  padding: 13px 15px; border: 1px solid var(--gris-ligne); border-radius: var(--radius);
  background: #fff; transition: border-color var(--transition);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--bleu); box-shadow: 0 0 0 3px rgba(29,111,179,.12); }
.field textarea { resize: vertical; min-height: 150px; }
.field-rgpd { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--gris); }
.field-rgpd input { width: auto; margin-top: 3px; }
.hp { position: absolute; left: -9999px; }

.alert { padding: 16px 20px; border-radius: var(--radius); margin-bottom: 28px; font-size: 15.5px; }
.alert-ok { background: #e6f4ec; border: 1px solid #b7dcc6; color: #1c6b4f; }
.alert-err { background: #fdeceb; border: 1px solid #f3c4c0; color: #b4271a; }

/* ---------- Bandeau CTA ---------- */
.cta {
  background: var(--encre); color: #fff; padding: 64px 0; text-align: center;
}
.cta h2 { color: #fff; font-size: 1.9rem; }
.cta p { color: rgba(255,255,255,.8); max-width: 56ch; margin: .4em auto 26px; }
.cta .btn-primary { background: #fff; color: var(--encre); }
.cta .btn-primary:hover { background: var(--gris-clair); color: var(--encre); }

/* ---------- Pied de page ---------- */
.site-footer { background: var(--footer); color: rgba(255,255,255,.78); margin-top: 0; }
.footer-inner {
  display: grid; grid-template-columns: 1.5fr 1fr auto; gap: 40px;
  padding-top: 56px; padding-bottom: 40px; align-items: start;
}
.footer-logo { height: 42px; width: auto; margin-bottom: 16px; }
.footer-baseline { font-family: var(--serif); font-size: 1.02rem; color: rgba(255,255,255,.7); max-width: 36ch; margin: 0; }
.footer-nav { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a { color: rgba(255,255,255,.8); font-size: 15px; }
.footer-nav a:hover { color: #fff; }
.footer-social a { display: inline-flex; align-items: center; gap: 8px; color: rgba(255,255,255,.85); font-size: 15px; }
.footer-social a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-top: 20px; padding-bottom: 28px; }
.footer-bottom p { font-size: 13.5px; color: rgba(255,255,255,.55); margin: 0; }

/* ---------- Utilitaires ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.empty {
  text-align: center; color: var(--gris); padding: 60px 0; font-size: 1.05rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr; }
  .value-list { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }

  .nav-burger { display: block; }
  .site-nav {
    position: absolute; top: 84px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--gris-ligne);
    max-height: 0; overflow: hidden; transition: max-height var(--transition);
  }
  .site-nav a { padding: 16px 24px; border-top: 1px solid var(--gris-ligne); border-radius: 0; }
  .site-nav a.is-active::after { display: none; }
  .nav-toggle:checked ~ .site-nav { max-height: 360px; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .section { padding: 54px 0; }
  .hero { padding: 64px 0 56px; }
  .article-chapeau { font-size: 1.15rem; }
}