/* Atlas Web Agency — feuille de style unique, sans dépendance. */
:root {
  --bg: #0d0d0f;
  --surface: #16161a;
  --surface-2: #1d1d22;
  --text: #f2efe8;
  --muted: #a8a49b;
  --line: rgba(255, 255, 255, 0.08);
  --gold: #d4a944;
  --gold-soft: rgba(212, 169, 68, 0.14);
  --on-gold: #15120a;
  --radius: 16px;
  --ease-out: cubic-bezier(0.2, 0, 0, 1);
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* En-tête */
.header { position: sticky; top: 0; z-index: 10; background: rgba(13, 13, 15, 0.86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; letter-spacing: 0.08em; }
.brand span { color: var(--gold); }
.nav { display: flex; gap: 24px; }
.nav a { text-decoration: none; color: var(--muted); font-size: 15px; transition: color 150ms ease; }
.nav a:hover { color: var(--text); }
@media (max-width: 720px) { .nav { display: none; } .header .btn { padding: 10px 14px; font-size: 14px; } }

/* Boutons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px; border-radius: 999px;
  background: var(--gold); color: var(--on-gold);
  font-weight: 600; text-decoration: none; font-size: 15px;
  transition: transform 160ms var(--ease-out), background-color 150ms ease;
}
.btn:hover { background: #e0b955; }
.btn:active { transform: scale(0.97); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn.ghost:hover { background: var(--surface-2); }
a:focus-visible, .btn:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; border-radius: 8px; }

/* Héros */
.hero { padding: 96px 0 80px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -30% -10% auto auto; width: 620px; height: 620px;
  background: radial-gradient(closest-side, var(--gold-soft), transparent); pointer-events: none;
}
.eyebrow { display: inline-block; padding: 6px 12px; border-radius: 999px; background: var(--gold-soft); color: var(--gold); font-size: 13px; font-weight: 600; letter-spacing: 0.04em; }
h1 { font-size: clamp(36px, 6vw, 64px); line-height: 1.06; margin: 18px 0 18px; letter-spacing: -0.02em; max-width: 14ch; }
h1 em { font-style: normal; color: var(--gold); }
.lead { font-size: clamp(17px, 2vw, 20px); color: var(--muted); max-width: 56ch; margin: 0 0 32px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* Texte + photo côte à côte (empilés sur mobile) */
.split { display: grid; gap: 40px; align-items: center; grid-template-columns: 1.1fr 1fr; }
.media { width: 100%; height: auto; aspect-ratio: 14 / 9; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45); }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } .hero .media { order: -1; } }

/* Sections */
section { padding: 80px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: clamp(28px, 4vw, 40px); line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.01em; }
.section-intro { color: var(--muted); max-width: 60ch; margin: 0 0 40px; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.section-alt .card { background: var(--bg); }
.card h3 { margin: 14px 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.icon { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--gold-soft); color: var(--gold); }

.steps { counter-reset: step; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.step { padding: 24px; border-left: 2px solid var(--gold); background: var(--surface-2); border-radius: 0 var(--radius) var(--radius) 0; }
.step::before { counter-increment: step; content: "0" counter(step); color: var(--gold); font-weight: 700; font-size: 14px; letter-spacing: 0.1em; }
.step h3 { margin: 8px 0 6px; font-size: 18px; }
.step p { margin: 0; color: var(--muted); font-size: 16px; }

.list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.list li { display: flex; gap: 12px; align-items: flex-start; }
.list li::before { content: ""; flex: 0 0 8px; height: 8px; margin-top: 9px; border-radius: 50%; background: var(--gold); }

/* Contact */
.contact { text-align: center; }
.contact .section-intro { margin-left: auto; margin-right: auto; }
.contact .actions { justify-content: center; }
.contact-lines { margin-top: 28px; color: var(--muted); font-size: 15px; }

/* Pied de page */
.footer { border-top: 1px solid var(--line); padding: 32px 0; color: var(--muted); font-size: 14px; }
.footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
.footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--text); }

/* Pages légales */
.legal { padding: 64px 0 80px; }
.legal .wrap { max-width: 760px; }
.legal h1 { font-size: clamp(30px, 5vw, 44px); max-width: none; }
.legal h2 { font-size: 22px; margin: 36px 0 10px; }
.legal p, .legal li { color: var(--muted); }
.legal strong { color: var(--text); font-weight: 600; }
.todo { background: rgba(212, 169, 68, 0.18); color: var(--gold); padding: 0 4px; border-radius: 4px; }

/* Apparition douce des sections */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 500ms var(--ease-out), transform 500ms var(--ease-out); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}