:root{
  --bg: #ffffff;
  --text: #0f172a;       /* bleu nuit/gris foncé */
  --subtle: #64748b;     /* gris bleuté */
  --accent: #0f766e;     /* vert sarcelle */
  --accent-2: #075985;   /* bleu canard */
  --border: #e2e8f0;     /* gris clair */
  --radius: 12px;
  --shadow: 0 6px 24px rgba(2, 6, 23, .08);
}

*{ box-sizing: border-box; }
html, body { margin:0; padding:0; }
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

/* Header & nav */
.site-header{
  position: sticky; top:0; z-index: 10;
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px 24px;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; color:inherit; }
.brand__logo{ height:40px; width:auto; border-radius: 6px; object-fit: cover; }
.brand__name{ font-weight: 700; letter-spacing: .2px; }

.site-nav{ display:flex; gap:14px; }
.site-nav a{
  color: var(--subtle);
  text-decoration:none;
  padding:8px 10px;
  border-radius:8px;
}
.site-nav a:hover{ color: var(--text); background: #f8fafc; }
.site-nav a.active, .site-nav a[aria-current="page"]{
  color:#fff; background: linear-gradient(135deg,var(--accent),var(--accent-2));
}

/* Layout */
main{ padding: 28px 24px 48px; max-width: 1100px; margin: 0 auto; }
.page h1{ margin-top: 10px; }

/* Hero */
.hero{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 28px;
  align-items: center;
  margin: 24px 0 12px;
}
.hero__text h1{ font-size: clamp(28px, 4vw, 44px); line-height: 1.15; margin:0 0 10px; }
.hero__text p{ color: var(--subtle); margin: 0 0 16px; max-width: 56ch; }
.hero__media img{
  width:100%; height:auto; display:block;
  border-radius: var(--radius); box-shadow: var(--shadow);
  object-fit: cover;
}
.hero__cta{ display:flex; gap: 10px; margin-top: 14px; }

/* Buttons */
.btn{
  display:inline-block;
  padding:10px 14px;
  border-radius: 10px;
  background: linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff; text-decoration:none; font-weight:600;
  box-shadow: 0 6px 18px rgba(15,118,110,.25);
}
.btn:hover{ filter: brightness(1.05); }
.btn--outline{
  background: transparent; color: var(--accent-2);
  border: 2px solid var(--accent-2);
  box-shadow: none;
}

/* Cards */
.cards{
  display:grid; gap:16px; margin-top: 24px;
  grid-template-columns: repeat(4, 1fr);
}
.card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  background: #fff;
}
.card h2{ margin: 2px 0 6px; font-size: 20px; }
.card p{ color: var(--subtle); margin: 0 0 10px; }
.card__link{ text-decoration:none; color: var(--accent-2); font-weight:600; }
.card__link:hover{ text-decoration: underline; }

/* Forms */
.form{ max-width: 640px; margin-top: 12px; }
.form__row{ display:flex; flex-direction:column; gap:6px; margin-bottom:12px; }
input, textarea{
  border:1px solid var(--border); border-radius:10px;
  padding:10px 12px; font: inherit;
}
input:focus, textarea:focus{
  outline: 3px solid #bae6fd; border-color: var(--accent-2);
}

/* Footer */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 18px 24px; text-align:center; color: var(--subtle);
}

/* Responsive */
@media (max-width: 980px){
  .cards{ grid-template-columns: repeat(2, 1fr); }
  .hero{ grid-template-columns: 1fr; }
}
@media (max-width: 560px){
  .cards{ grid-template-columns: 1fr; }
  .site-nav{ gap:6px; flex-wrap: wrap; }
}

/* Accessibilité préférences */
@media (prefers-reduced-motion: reduce){
  * { animation: none !important; transition: none !important; }
}