/* Blue Night – Minimal multipage website (PC + Mobile) */
:root{
  --bg:#0a1020;           /* fond global bleu nuit */
  --bg-2:#060b19;         /* fond profond */
  --surface:#0f1730;      /* cartes/sections */
  --edge:rgba(255,255,255,.06);
  --primary:#5ab0ff;      /* bleu */
  --primary-2:#7ee0ff;    /* cyan */
  --text:#e8f0ff;         /* texte principal */
  --muted:#9fb3d1;        /* texte secondaire */
  --radius:18px;
  --shadow:0 12px 30px rgba(0,0,0,.35);
  --maxw:1100px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font:16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(90,176,255,.18), transparent 60%),
    radial-gradient(1000px 500px at 10% -5%, rgba(126,224,255,.12), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  min-height:100vh;
}

a{color:var(--primary); text-decoration:none}
img{max-width:100%; display:block}
.wrap{max-width:var(--maxw); margin-inline:auto; padding:0 22px}
.section{padding:72px 0}
.card{background:linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.02)); border:1px solid var(--edge); border-radius:var(--radius); box-shadow:var(--shadow)}

header.site{
  position:sticky; top:0; z-index:50;
  backdrop-filter:saturate(140%) blur(8px);
  background:rgba(10,16,32,.7);
  border-bottom:1px solid var(--edge);
}
.topbar{display:flex; align-items:center; justify-content:space-between; height:68px}
.brand{display:flex; align-items:center; gap:12px}
.brand .logo{width:28px; height:28px}
.brand b{letter-spacing:.3px}

/* ===== NAV / MENUS DÉROULANTS ===== */
.nav{display:flex; align-items:center}
.menu{
  display:flex; align-items:center; gap:18px;
  list-style:none; margin:0; padding:0;
}
.menu > li{position:relative}

/* Liens & boutons de niveau 1 */
.menu > li > a,
.menu > li > .submenu-toggle{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 10px; border-radius:10px;
  color:var(--text); opacity:.9;
  background:none; border:0; cursor:pointer; font:inherit;
  text-decoration:none;
}
.menu > li > a:hover,
.menu > li > .submenu-toggle:hover,
.menu > li > a:focus-visible,
.menu > li > .submenu-toggle:focus-visible{
  opacity:1; background:rgba(255,255,255,.06);
}

/* Bouton avec chevron */
.submenu-toggle::after{
  content:"▾"; font-size:.9em; transform:translateY(-1px);
  margin-left:6px; opacity:.9;
}

/* Sous-menus (desktop) */
.submenu{
  position:absolute; top:100%; left:0; min-width:220px;
  padding:8px 0; margin-top:8px; list-style:none;
  background:linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.02));
  border:1px solid var(--edge);
  border-radius:12px; box-shadow:var(--shadow);
  opacity:0; visibility:hidden; transform:translateY(6px);
  transition:opacity .16s ease, transform .16s ease, visibility .16s;
  z-index:1000;
}
.submenu li a{
  display:block; padding:10px 14px;
  color:var(--text); text-decoration:none; white-space:nowrap;
}
.submenu li a:hover, .submenu li a:focus-visible{
  background:rgba(255,255,255,.06);
}

/* Affichage au survol/focus (desktop) */
.has-submenu:hover > .submenu,
.has-submenu:focus-within > .submenu{
  opacity:1; visibility:visible; transform:translateY(0);
}

/* État ouvert au clic (mobile ou accessibilité) */
.has-submenu.open > .submenu{
  opacity:1; visibility:visible; transform:translateY(0);
}

/* Lien "Contact" déjà stylé en .cta */
.cta{
  padding:10px 14px; border-radius:12px;
  background:linear-gradient(90deg, var(--primary), var(--primary-2));
  color:#001122; font-weight:700
}

/* Burger */
.burger{display:none; border:1px solid var(--edge); border-radius:12px; padding:8px 10px; background:transparent; color:var(--text)}

/* ===== Responsive Nav ===== */
@media (max-width:900px){
  .nav{display:none}
  .burger{display:inline-flex}
  .nav.open{
    display:flex; position:absolute; top:68px; left:0; right:0;
    background:rgba(10,16,32,.95); border-bottom:1px solid var(--edge);
  }
  .menu{
    flex-direction:column; align-items:stretch; gap:0; width:100%;
  }
  .menu > li > a,
  .menu > li > .submenu-toggle{
    width:100%; justify-content:space-between; padding:16px 22px;
    border-top:1px solid var(--edge); border-radius:0;
    background:transparent;
  }
  /* Sous-menus intégrés en colonne sur mobile */
  .submenu{
    position:static; margin:0; padding:0 0 8px 0;
    border:0; box-shadow:none; background:transparent;
    opacity:1; visibility:visible; transform:none; display:none;
  }
  .has-submenu.open > .submenu{ display:block; }
  .submenu li a{ padding:10px 26px; }
}

/* Ancien ciblage .nav a (maintenu pour compat) */
.nav a.active{opacity:1; background:rgba(255,255,255,.06)}

/* Hero */
.hero{display:grid; grid-template-columns:1.15fr .85fr; gap:36px; align-items:center}
.hero h1{font-size:clamp(28px, 5vw, 48px); line-height:1.1; margin:0 0 12px}
.lead{color:var(--muted); font-size:1.05rem; margin-bottom:24px}
.hero .actions{display:flex; gap:14px; flex-wrap:wrap}
.hero-visual{position:relative}
.hero-visual .blob{position:absolute; inset:-20px; z-index:-1; filter:blur(40px); opacity:.35;
  background:radial-gradient(220px 160px at 20% 30%, var(--primary), transparent 60%),
             radial-gradient(260px 180px at 80% 60%, var(--primary-2), transparent 65%)}
@media (max-width:980px){ .hero{grid-template-columns:1fr} }

/* Grids */
.grid{display:grid; gap:18px}
.grid-3{grid-template-columns:repeat(3, 1fr)}
.grid-2{grid-template-columns:repeat(2, 1fr)}
@media (max-width:860px){ .grid-3, .grid-2{grid-template-columns:1fr} }

.feature{padding:22px}
.feature h3{margin:6px 0 8px}
.muted{color:var(--muted)}

/* Footer */
footer{padding:40px 0; color:var(--muted); border-top:1px solid var(--edge)}
.foot{display:flex; flex-wrap:wrap; gap:12px; justify-content:space-between; align-items:center}

/* Forms */
input, textarea{width:100%; padding:12px; border-radius:12px; border:1px solid var(--edge); background:rgba(255,255,255,.03); color:var(--text)}
label{display:block; margin:10px 0 6px}

/* Tables (tarifs) */
.table{width:100%; border-collapse:separate; border-spacing:0 10px}
.table th, .table td{padding:12px 14px; text-align:left}
.table tr{background:linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.02)); border:1px solid var(--edge)}
.table tr td:first-child, .table tr th:first-child{border-top-left-radius:12px; border-bottom-left-radius:12px}
.table tr td:last-child, .table tr th:last-child{border-top-right-radius:12px; border-bottom-right-radius:12px}

/* Accessibility */
:focus{outline:2px dashed var(--primary-2); outline-offset:3px}