/* France Rail Développement — feuille de style principale */
:root {
  --blue: #004aad;
  --blue-dark: #003a88;
  --navy: #0b1030;
  --navy-2: #141a45;
  --blue-light: #eaf1fb;
  --orange: #ed7d31;
  --text: #1f2937;
  --muted: #5b6475;
  --border: #dde3ee;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(11, 16, 48, .08);
  --container: 1160px;
  --font: "Lato", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--white);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); }
a:hover { color: var(--blue-dark); }
h1, h2, h3, h4 { color: var(--navy); line-height: 1.2; margin: 0 0 .6em; font-weight: 700; }
h1 { font-size: clamp(2rem, 4.5vw, 3.3rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--blue); color: #fff; padding: 8px 14px; z-index: 100; }
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- En-tête ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 78px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--navy); }
.brand img { width: 54px; height: 54px; object-fit: contain; }
.brand-name { font-weight: 700; font-size: 1.05rem; line-height: 1.15; letter-spacing: .02em; }
.brand-name small { display: block; font-weight: 400; font-size: .78rem; color: var(--muted); letter-spacing: .04em; }

.main-nav ul { list-style: none; display: flex; gap: 6px; margin: 0; padding: 0; align-items: center; }
.main-nav a {
  display: block; padding: 10px 14px; border-radius: 6px;
  color: var(--navy); text-decoration: none; font-weight: 600; font-size: .97rem;
  position: relative;
}
.main-nav a:hover { color: var(--blue); }
.main-nav a[aria-current="page"] { color: var(--blue); }
.main-nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px;
  height: 2px; background: var(--orange); border-radius: 2px;
}
.main-nav .nav-cta { background: var(--blue); color: #fff; margin-left: 8px; }
.main-nav .nav-cta:hover { background: var(--blue-dark); color: #fff; }
.main-nav .nav-cta[aria-current="page"]::after { display: none; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--border); border-radius: 8px;
  width: 46px; height: 42px; cursor: pointer; padding: 0; align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 22px; height: 2px; background: var(--navy); position: relative; content: "";
  transition: transform .2s;
}
.nav-toggle span::before { position: absolute; top: -7px; }
.nav-toggle span::after { position: absolute; top: 7px; }

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .main-nav {
    position: absolute; top: 78px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    display: none; box-shadow: var(--shadow);
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; padding: 12px 16px 18px; gap: 2px; }
  .main-nav a { padding: 12px 10px; }
  .main-nav a[aria-current="page"]::after { left: 10px; right: auto; width: 28px; bottom: 6px; }
  .main-nav .nav-cta { margin: 8px 0 0; text-align: center; }
  .brand-name small { display: none; }
}

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px; border-radius: 8px; border: 2px solid transparent;
  font-weight: 700; font-size: 1rem; text-decoration: none; cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
  font-family: inherit;
}
.btn svg { width: 18px; height: 18px; transition: transform .2s; }
.btn:hover svg { transform: translateX(3px); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); color: #fff; }
.btn-outline { border-color: var(--blue); color: var(--blue); background: transparent; }
.btn-outline:hover { background: var(--blue); color: #fff; }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { background: var(--blue-light); color: var(--navy); }
.btn-ghost-light { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost-light:hover { background: #fff; color: var(--navy); }

/* ---------- Bandeau (hero) ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(0, 74, 173, .55), transparent 60%),
    radial-gradient(800px 400px at -10% 110%, rgba(0, 74, 173, .35), transparent 60%),
    linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
}
.hero .rails { position: absolute; inset: auto 0 0 0; width: 100%; height: 100%; opacity: .5; pointer-events: none; }
.hero-inner { position: relative; padding: 110px 0 120px; max-width: 780px; }
.hero h1 { color: #fff; margin-bottom: .35em; }
.hero .lead { font-size: clamp(1.15rem, 2vw, 1.4rem); color: #d7def0; margin-bottom: 1.2em; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  text-transform: uppercase; letter-spacing: .14em; font-size: .8rem; font-weight: 700;
  color: var(--orange); margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--orange); }
.keywords { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 0 0 36px; padding: 0; list-style: none; color: #fff; font-weight: 600; letter-spacing: .03em; }
.keywords li { display: flex; align-items: center; gap: 18px; }
.keywords li + li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--orange); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

.hero-full { min-height: 100vh; display: flex; align-items: center; }
.page-hero .hero-inner { padding: 80px 0 86px; }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); }
.breadcrumb { font-size: .88rem; color: #aab4d0; margin-bottom: 14px; }
.breadcrumb a { color: #d7def0; text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; color: #fff; }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--blue-light); }
.section-head { max-width: 760px; margin-bottom: 52px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-head.center .eyebrow { justify-content: center; }
.section-head p { color: var(--muted); font-size: 1.08rem; }
.eyebrow.dark { color: var(--blue); }

.two-col { display: grid; grid-template-columns: 1.1fr .9fr; gap: 64px; align-items: center; }
@media (max-width: 880px) { .two-col { grid-template-columns: 1fr; gap: 40px; } }

.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 1000px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 880px) { .grid-3 { grid-template-columns: 1fr; } }
@media (max-width: 680px) { .grid-4, .grid-2 { grid-template-columns: 1fr; } }

/* ---------- Cartes ---------- */
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(11,16,48,.12); border-color: #c7d4ea; }
.card h3 { margin-bottom: .5em; }
.card p { color: var(--muted); margin: 0; }
.icon {
  width: 54px; height: 54px; border-radius: 12px; display: grid; place-items: center;
  background: var(--blue-light); color: var(--blue); margin-bottom: 20px;
}
.icon svg { width: 28px; height: 28px; }
.card-num { font-size: .85rem; font-weight: 700; color: var(--orange); letter-spacing: .1em; margin-bottom: 10px; display: block; }

.pillar { border-top: 4px solid var(--blue); }
.pillar ul { list-style: none; padding: 0; margin: 0; }
.pillar li { position: relative; padding-left: 22px; margin-bottom: 10px; color: var(--muted); font-size: .97rem; line-height: 1.5; }
.pillar li::before { content: ""; position: absolute; left: 0; top: .55em; width: 8px; height: 8px; border-radius: 2px; background: var(--orange); }

/* Liste groupe */
.group-list { list-style: none; padding: 0; margin: 0 0 32px; }
.group-list li { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border); }
.group-list li:last-child { border-bottom: none; }
.group-list .group-logo { flex: none; width: auto; height: 40px; max-width: 160px; object-fit: contain; background: #fff; border-radius: 6px; }
.group-list .dot { flex: none; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: var(--blue); color: #fff; font-weight: 700; font-size: .85rem; }
.group-list .dot svg { width: 22px; height: 22px; }
.group-list strong { color: var(--navy); display: block; }
.group-list span { color: var(--muted); }

/* Bloc visuel chiffres */
.stat-panel {
  background: linear-gradient(150deg, var(--blue) 0%, var(--navy) 100%);
  color: #fff; border-radius: 16px; padding: 44px 40px; position: relative; overflow: hidden;
}
.stat-panel::after {
  content: ""; position: absolute; right: -80px; bottom: -80px; width: 260px; height: 260px;
  border: 2px solid rgba(255,255,255,.15); border-radius: 50%;
}
.stat { padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.15); position: relative; z-index: 1; }
.stat:last-child { border-bottom: none; }
.stat b { display: block; font-size: 2.3rem; line-height: 1.1; }
.stat span { color: #c9d4ef; font-size: .97rem; }

/* Citation */
.quote-section {
  background: linear-gradient(135deg, var(--blue) 0%, #013b8a 55%, var(--navy) 100%);
  color: #fff; padding: 100px 0; position: relative; overflow: hidden;
}
.quote-section .rails { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .35; }
.quote { position: relative; max-width: 900px; margin: 0 auto; text-align: center; }
.quote .mark { font-size: 5rem; line-height: .6; color: var(--orange); font-family: Georgia, serif; display: block; margin-bottom: 18px; }
.quote blockquote { margin: 0 0 36px; font-size: clamp(1.2rem, 2.3vw, 1.6rem); line-height: 1.55; font-weight: 300; }
.quote h2 { color: #fff; font-size: 1rem; text-transform: uppercase; letter-spacing: .14em; margin-bottom: 26px; font-weight: 700; color: #c9d4ef; }

/* Bandeau confiance */
.trust { padding: 56px 0; border-top: 1px solid var(--border); }
.trust-inner { display: flex; flex-wrap: wrap; gap: 20px 40px; align-items: center; justify-content: space-between; }
.trust p { margin: 0; font-size: 1.1rem; color: var(--navy); font-weight: 600; max-width: 520px; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; margin: 0; padding: 0; }
.chips li { padding: 9px 16px; border-radius: 999px; background: var(--blue-light); color: var(--blue); font-weight: 700; font-size: .9rem; }

/* CTA */
.cta {
  background: var(--navy); color: #fff; border-radius: 16px; padding: 56px 52px;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
  position: relative; overflow: hidden;
}
.cta::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 6px; background: var(--orange); }
.cta h2 { color: #fff; margin-bottom: .25em; }
.cta p { color: #c9d4ef; margin: 0; font-size: 1.08rem; }

/* Filiales */
.subsidiary { display: flex; flex-direction: column; padding: 40px 36px; }
.subsidiary .subsidiary-logo {
  display: block; height: 110px; width: 100%; max-width: 280px;
  object-fit: contain; object-position: left center; margin-bottom: 24px;
}
.subsidiary .tag { display: inline-block; font-size: .78rem; text-transform: uppercase; letter-spacing: .12em; font-weight: 700; color: var(--orange); margin-bottom: 8px; }
.subsidiary h2, .subsidiary h3 { font-size: 1.6rem; }
.subsidiary p { color: var(--muted); margin-bottom: 1em; }
.subsidiary .btn { margin-top: auto; align-self: flex-start; }
.subsidiary ul { margin: 0 0 1.5em; padding-left: 0; list-style: none; }
.subsidiary ul li { padding-left: 22px; position: relative; color: var(--muted); margin-bottom: 6px; }
.subsidiary ul li::before { content: ""; position: absolute; left: 0; top: .6em; width: 8px; height: 8px; border-radius: 2px; background: var(--orange); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1.4fr .9fr; gap: 48px; align-items: start; }
@media (max-width: 960px) { .contact-grid { grid-template-columns: 1fr; } }
.form-card { padding: 44px 40px; }
@media (max-width: 560px) { .form-card { padding: 30px 22px; } .cta { padding: 40px 28px; } .stat-panel { padding: 34px 26px; } }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }
.field { margin-bottom: 20px; }
.field label { display: block; font-weight: 700; color: var(--navy); margin-bottom: 7px; font-size: .95rem; }
.field label .req { color: var(--orange); }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 14px; border: 1px solid #c9d1df; border-radius: 8px;
  font: inherit; font-size: 1rem; color: var(--text); background: #fff;
  transition: border-color .2s, box-shadow .2s;
}
.field textarea { min-height: 170px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(0,74,173,.15); }
.field.consent { display: flex; gap: 12px; align-items: flex-start; }
.field.consent input { width: 18px; height: 18px; margin-top: 4px; flex: none; }
.field.consent label { font-weight: 400; color: var(--muted); font-size: .92rem; margin: 0; }
.hp { position: absolute !important; left: -10000px !important; width: 1px; height: 1px; overflow: hidden; }
.form-note { font-size: .88rem; color: var(--muted); margin: 18px 0 0; }
.form-status { display: none; margin-top: 20px; padding: 14px 16px; border-radius: 8px; font-weight: 600; }
.form-status.ok { display: block; background: #e8f6ee; color: #146c3a; border: 1px solid #b9e2c9; }
.form-status.err { display: block; background: #fdecec; color: #9b1c1c; border: 1px solid #f3c2c2; }

.info-card { padding: 36px 32px; }
.info-item { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.info-item:last-of-type { border-bottom: none; }
.info-item .icon { width: 44px; height: 44px; margin: 0; flex: none; }
.info-item .icon svg { width: 22px; height: 22px; }
.info-item strong { display: block; color: var(--navy); }
.info-item span, .info-item a { color: var(--muted); }
.info-item a { color: var(--blue); }
.sub-links { margin-top: 24px; padding: 22px; background: var(--blue-light); border-radius: 8px; font-size: .95rem; }
.sub-links p { margin: 0 0 8px; color: var(--navy); font-weight: 700; }
.sub-links ul { margin: 0; padding-left: 18px; color: var(--muted); }

/* ---------- Mentions légales ---------- */
.legal { max-width: 820px; }
.legal h2 { font-size: 1.35rem; margin-top: 2em; padding-top: 1em; border-top: 1px solid var(--border); }
.legal h2:first-of-type { margin-top: 0; border-top: 0; padding-top: 0; }
.legal p, .legal li { color: #374151; }
.legal dl { display: grid; grid-template-columns: 220px 1fr; gap: 8px 20px; margin: 0; }
.legal dt { font-weight: 700; color: var(--navy); }
.legal dd { margin: 0; color: #374151; }
@media (max-width: 600px) { .legal dl { grid-template-columns: 1fr; } .legal dd { margin-bottom: 10px; } }

/* ---------- Pied de page ---------- */
.site-footer { background: var(--navy); color: #c9d4ef; padding: 72px 0 0; font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 52px; }
@media (max-width: 960px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; text-decoration: none; }
.footer-brand img { width: 64px; height: 64px; background: #fff; border-radius: 50%; padding: 4px; object-fit: contain; }
.footer-brand span { color: #fff; font-weight: 700; font-size: 1.05rem; line-height: 1.2; }
.site-footer h4 { color: #fff; font-size: .82rem; text-transform: uppercase; letter-spacing: .14em; margin-bottom: 18px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 10px; }
.site-footer a { color: #c9d4ef; text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.site-footer address { font-style: normal; line-height: 1.7; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0; font-size: .87rem; color: #8f9bc0; }
.footer-bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- Animations ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, .btn svg { transition: none; }
}
.no-js .reveal { opacity: 1; transform: none; }