/* Thème modernisé: bleu marine & blanc, accent bleu lumineux. Accessible AA, responsive. */
:root {
  --navy: #0B2A4A;
  --navy-600: #0E355C;
  --navy-700: #081D31;
  --white: #FFFFFF;
  --gray-25: #FAFBFC;
  --gray-50: #F5F7FA;
  --gray-100: #E8EEF4;
  --gray-300: #C5D1DD;
  --gray-600: #4B5A6B;
  --gray-800: #1C2430;
  --accent: #29B6F6; /* bleu clair pour accents visuels */
  --success: #0E9F6E;
  --danger: #DC2626;
  --focus: #2563EB;
  --radius: 14px;
  --maxw: 1080px;
  --gutter: 24px; /* marge intérieure globale */
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  color: var(--gray-800);
  background: var(--white);
}

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

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: 48px 0; }
.section-title { font-size: clamp(1.4rem, 2vw, 1.8rem); margin: 0 0 8px; color: var(--navy); }
.section-intro { color: var(--gray-600); margin: 8px 0 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 70; background: linear-gradient(180deg, var(--navy) 0%, var(--navy-600) 100%); color: var(--white); box-shadow: 0 4px 18px rgba(0,0,0,.18); }
.site-header .container { padding-left: calc(var(--gutter) + 16px); padding-right: var(--gutter); }
.header-inner { display: flex; align-items: center; justify-content: flex-start; padding: 14px 0; gap: 10px; }
.logo { font-weight: 900; color: var(--white); text-decoration: none; font-size: 1.35rem; letter-spacing: .6px; white-space: nowrap; margin-left: 4px; }

/* Mobile menu */
.menu-toggle { display: inline-flex; flex-direction: column; gap: 4px; width: 38px; height: 32px; background: transparent; border: 2px solid rgba(255,255,255,.3); border-radius: 10px; align-items: center; justify-content: center; color: var(--white); }
.menu-toggle span { display: block; width: 20px; height: 2px; background: currentColor; }

.main-nav a { color: var(--white); text-decoration: none; margin-left: 18px; opacity: .9; }
.main-nav a:hover { opacity: 1; }
.main-nav .btn-small { background: var(--white); color: var(--navy); padding: 8px 12px; border-radius: 10px; font-weight: 700; }

@media (max-width: 959px) {
  .main-nav { position: fixed; top: 0; right: 0; height: 100%; width: min(78vw, 420px); background: var(--navy-700); padding: 84px var(--gutter) 24px; display: grid; gap: 14px; transform: translateX(100%); transition: transform .25s ease; box-shadow: -12px 0 30px rgba(0,0,0,.3); }
  .main-nav a { margin: 0; font-size: 1.05rem; }
  body.nav-open .main-nav { transform: translateX(0); }
  .menu-toggle { display: inline-flex; }
}
@media (min-width: 960px) {
  .menu-toggle { display: none; }
  .main-nav { position: static; display: flex; align-items: center; height: auto; width: auto; padding: 0; transform: none; box-shadow: none; }
}

/* Hero */
.hero { position: relative; overflow: hidden; color: var(--white); background: radial-gradient(ellipse at top left, #10406f 0%, var(--navy-700) 60%); }
.hero .container { display: grid; gap: 24px; align-items: center; grid-template-columns: 1fr; padding: 56px var(--gutter); }
.hero-title { font-size: clamp(2.2rem, 5vw, 3.2rem); margin: 0; letter-spacing: .4px; }
.hero-subtitle { margin: 10px 0 22px; color: #E7F3FF; max-width: 60ch; }
.hero-figure { justify-self: center; filter: drop-shadow(0 30px 80px rgba(0,0,0,.45)); animation: floatGlow 6s ease-in-out infinite; }
.hero-figure img { border-radius: 22px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
@keyframes floatGlow { 0%,100%{ transform: translateY(0)} 50%{ transform: translateY(-6px)} }

/* Trust band */
.trust-band { background: var(--gray-50); border-top: 1px solid var(--gray-100); border-bottom: 1px solid var(--gray-100); }
.trust-text { margin: 12px 0; color: var(--gray-600); text-align: center; }

/* Security band */
.security-band { background: linear-gradient(180deg,#0E355C,#0B2A4A); color: var(--white); }
.security-text { margin: 0; padding: 12px 0; text-align: center; opacity: .95; }

/* Steps */
.steps { display: grid; grid-template-columns: 1fr; gap: 14px; margin-top: 12px; }
.step { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start; padding: 14px; border: 1px solid var(--gray-100); border-radius: var(--radius); background: var(--white); box-shadow: 0 6px 18px rgba(13,30,60,.06); }
.step-badge { width: 36px; height: 36px; border-radius: 999px; background: linear-gradient(135deg, var(--accent), #76D7FB); display: inline-grid; place-items: center; color: var(--navy); font-weight: 900; }

/* Cards & grid */
.grid { display: grid; gap: 18px; }
.grid.cols-3 { grid-template-columns: 1fr; }
.card { border: 1px solid var(--gray-100); border-radius: var(--radius); background: var(--white); box-shadow: 0 6px 22px rgba(13,30,60,.08); overflow: hidden; display: grid; transition: transform .25s ease, box-shadow .25s ease; }
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(13,30,60,.12); }
.card-media { aspect-ratio: 16/9; background: var(--gray-50); overflow: hidden; }
.card-media img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 16px; }
.card h3 { margin: 0 0 6px; color: var(--navy); }
.card p { margin: 0 0 8px; color: var(--gray-600); }
.card .btn-ghost { margin-top: 4px; }

/* Backdrop for mobile nav */
.nav-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.4); backdrop-filter: blur(2px); opacity: 0; pointer-events: none; transition: opacity .25s ease; z-index: 60; }
body.nav-open .nav-backdrop { opacity: 1; pointer-events: auto; }

/* Footer */
.site-footer { position: relative; margin-top: 56px; background: linear-gradient(180deg, var(--navy-600), var(--navy)); color: var(--white); }
.site-footer::before { content: ""; display: block; height: 4px; background: linear-gradient(90deg,#6FD0FF,#2BA7E2,#6FD0FF); opacity: .9; }
.footer-inner { padding: 28px 0; display: grid; gap: 10px; justify-items: center; }
.footer-nav a { margin: 0 10px; color: var(--white); text-decoration: none; opacity: .9; }
.footer-nav a:hover { opacity: 1; text-decoration: underline; }

/* Lists */
.list { padding-left: 18px; }
.list li { margin: 6px 0; }

/* Buttons & links */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: none; cursor: pointer; text-decoration: none; border-radius: 12px; font-weight: 800; letter-spacing: .2px; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--white); color: var(--navy); padding: 12px 18px; border: 2px solid #A6D9FF; box-shadow: 0 10px 30px rgba(76,180,255,.25); }
.hero .btn-primary { background: linear-gradient(135deg,#6FD0FF,#2BA7E2); color: #052238; border: none; }
.btn-primary:hover { filter: brightness(.95); box-shadow: 0 14px 34px rgba(76,180,255,.35); }
.btn-ghost { background: var(--gray-10); }
.btn-ghost:hover { background: var(--gray-50); }
.btn-small { padding: 8px 12px; border-radius: 10px; }
.link-secondary { color: var(--white); text-decoration: underline; }

/* Forms */
.form { display: grid; gap: 18px; margin-top: 16px; }
.form fieldset { border: 1px solid var(--gray-100); border-radius: var(--radius); padding: 16px; }
/* Evidence preview */
.evidence-preview { display: grid; grid-template-columns: repeat(auto-fill,minmax(120px,1fr)); gap: 10px; margin-top: 8px; }
.evidence-item { border: 1px solid var(--gray-100); border-radius: 10px; padding: 8px; background: var(--white); box-shadow: 0 2px 8px rgba(13,30,60,.06); display: grid; gap: 6px; }
.evidence-thumb { aspect-ratio: 16/10; background: var(--gray-50); border-radius: 8px; overflow: hidden; display: grid; place-items: center; color: var(--gray-600); font-size: .9rem; }
.evidence-thumb img { width: 100%; height: 100%; object-fit: cover; }
.evidence-name { font-size: .9rem; color: var(--gray-800); word-break: break-all; }
.form legend { padding: 0 8px; font-weight: 800; color: var(--navy); }
.form-field { display: grid; gap: 6px; }
.form-field.inlined { grid-template-columns: 1fr 1fr; gap: 12px; }
.form-field-checkbox { align-items: start; grid-template-columns: auto 1fr; column-gap: 10px; }
.form-field-checkbox label { margin-top: 2px; }
label { font-weight: 700; color: var(--navy); }
input[type="text"], input[type="email"], input[type="tel"], select, textarea {
  width: 100%; padding: 12px; border: 1px solid var(--gray-300); border-radius: 12px; background: var(--white); color: var(--gray-800);
}
textarea { resize: vertical; }
.form-help { color: var(--gray-600); font-size: .92rem; }
.form-error { color: var(--danger); font-weight: 700; min-height: 1.2em; }
.form-status { margin: 8px 0; color: var(--danger); font-weight: 700; }
.form-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* Sub-hero */
.sub-hero { background: linear-gradient(180deg,#0E355C,#0B2A4A); color: var(--white); padding: 28px 0; }
.sub-hero .wrap { display: grid; gap: 16px; grid-template-columns: 1fr; align-items: center; }
.sub-hero .figure { justify-self: end; max-width: 520px; filter: drop-shadow(0 18px 50px rgba(0,0,0,.35)); }

/* Recap & confirmation */
.recap { margin-top: 12px; }
.recap-card { border: 1px solid var(--gray-100); border-radius: var(--radius); background: var(--white); box-shadow: 0 6px 22px rgba(13,30,60,.08); padding: 16px; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }
.recap-list { display: grid; gap: 10px; }
.recap-list dt { font-weight: 800; color: var(--navy); }
.recap-list dd { margin: 0; color: var(--gray-800); }
.confirm-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.note { color: var(--gray-600); }

/* Focus states */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px;
}

/* Responsive */
@media (min-width: 640px) {
  .grid.cols-3 by{ grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 780px) {
  :root { --gutter: 32px; }

  .hero .container { grid-template-columns: 1.1fr .9fr; padding: 80px 20px; }
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .sub-hero .wrap { grid-template-columns: 1fr .9fr; }
}
@media (min-width: 1200px) {
  :root { --gutter: 40px; }
}