:root {
  --bg: #0b0f17;
  --bg-soft: #101724;
  --surface: #151d2e;
  --surface-2: #1a2337;
  --border: #24304a;
  --text: #e8edf7;
  --text-dim: #9aa7bd;
  --primary: #4f8cff;
  --primary-strong: #2f6bff;
  --primary-soft: rgba(79, 140, 255, 0.12);
  --accent: #34d399;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: #7caeff; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; gap: 32px;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), #7a5cff);
  color: #fff; font-weight: 800; font-size: 18px;
}
.brand-text { font-weight: 700; font-size: 19px; letter-spacing: 0.2px; color: var(--text); }
.brand-text .accent { color: var(--primary); }

.nav-links { display: flex; gap: 22px; margin: 0 auto; }
.nav-links a { color: var(--text-dim); font-weight: 500; padding: 6px 2px; border-bottom: 2px solid transparent; }
.nav-links a:hover { color: var(--text); }
.nav-links a.is-active { color: var(--text); border-bottom-color: var(--primary); }

.nav-right { display: flex; align-items: center; gap: 18px; }

.lang-switch { display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: 13px; }
.lang-switch a { color: var(--text-dim); padding: 4px 7px; border-radius: 6px; }
.lang-switch a.is-active { color: #fff; background: var(--primary-soft); }
.lang-sep { color: var(--border); }

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; border-radius: 10px; border: 1px solid transparent;
  cursor: pointer; transition: transform .12s ease, box-shadow .12s ease, background .15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 8px 14px; font-size: 13.5px; }
.btn-lg { padding: 14px 24px; font-size: 16px; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-strong)); color: #fff; box-shadow: 0 6px 18px rgba(47, 107, 255, 0.35); }
.btn-primary:hover { color: #fff; box-shadow: 0 8px 24px rgba(47, 107, 255, 0.5); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { color: #fff; border-color: var(--primary); }
.btn-light { background: #fff; color: #0b0f17; }
.btn-light:hover { background: #eef2ff; color: #0b0f17; }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 110px;
  background:
    radial-gradient(900px 400px at 20% -10%, rgba(79,140,255,0.18), transparent 60%),
    radial-gradient(800px 400px at 90% 10%, rgba(122,92,255,0.14), transparent 60%),
    var(--bg);
}
.hero-inner { text-align: center; max-width: 780px; }
.hero-badge {
  display: inline-block; padding: 7px 14px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary);
  font-weight: 600; font-size: 13px; letter-spacing: 0.4px;
  border: 1px solid rgba(79,140,255,0.25); margin-bottom: 22px;
}
.hero-title { font-size: 56px; line-height: 1.05; font-weight: 800; letter-spacing: -1px; margin-bottom: 20px; }
.hero-subtitle { font-size: 20px; color: var(--text-dim); max-width: 640px; margin: 0 auto 34px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Bandeau promo ---------- */
.promo-band {
  background: linear-gradient(120deg, #16233d, #1b1f4d);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 40px 0;
}
.promo-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.promo-inner h2 { font-size: 24px; margin-bottom: 6px; }
.promo-inner p { color: var(--text-dim); max-width: 560px; }

/* ---------- Features ---------- */
.features { padding: 80px 0; }
.section-head h2 { font-size: 30px; margin-bottom: 34px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; }
.feature-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: transform .15s ease, border-color .15s ease;
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--primary); }
.feature-icon {
  width: 44px; height: 44px; display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary); border-radius: 10px;
  font-size: 22px; margin-bottom: 16px;
}
.feature-card h3 { font-size: 17px; margin-bottom: 8px; }
.feature-card p { color: var(--text-dim); font-size: 14.5px; }

/* ---------- Pages internes ---------- */
.page-hero { padding: 64px 0 30px; }
.page-hero h1 { font-size: 40px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 12px; }
.page-hero .lead { font-size: 19px; color: var(--text-dim); max-width: 720px; }
.page-body { padding-bottom: 90px; max-width: 820px; }
.page-body p { color: var(--text-dim); margin-bottom: 18px; font-size: 16px; }

.feature-list { list-style: none; margin: 8px 0 28px; display: grid; gap: 12px; }
.feature-list li {
  position: relative; padding-left: 34px; color: var(--text);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px 14px 40px;
}
.feature-list li::before {
  content: "✓"; position: absolute; left: 15px; top: 13px;
  color: var(--accent); font-weight: 800;
}
.cta-row { display: flex; gap: 14px; margin-top: 26px; flex-wrap: wrap; }

/* ---------- Download ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.dl-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; display: flex; flex-direction: column; gap: 14px;
}
.dl-card-featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), var(--shadow);
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
}
.dl-card h3 { font-size: 20px; }
.dl-card p { color: var(--text-dim); font-size: 15px; flex-grow: 1; }
.dl-meta {
  font-family: var(--mono); font-size: 13px !important; color: var(--primary) !important;
  background: var(--primary-soft); padding: 6px 10px; border-radius: 7px; display: inline-block; flex-grow: 0 !important;
}
.dl-hint { font-size: 12.5px !important; color: var(--text-dim); }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-soft); border-top: 1px solid var(--border); padding-top: 54px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 30px; padding-bottom: 40px; }
.footer-brand .brand-mark { margin-bottom: 14px; }
.footer-brand p { color: var(--text-dim); font-size: 14px; max-width: 280px; }
.footer-license { margin-top: 8px; color: var(--primary) !important; font-family: var(--mono); font-size: 13px !important; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 { font-size: 14px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--text-dim); margin-bottom: 4px; }
.footer-col a { color: var(--text); font-size: 15px; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding: 20px 24px; }
.footer-bottom p { color: var(--text-dim); font-size: 13px; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .nav { flex-wrap: wrap; height: auto; padding: 14px 0; gap: 14px; }
  .nav-links { order: 3; width: 100%; justify-content: center; gap: 18px; }
  .nav-right { margin-left: auto; }
  .hero-title { font-size: 38px; }
  .hero { padding: 64px 0 76px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .promo-inner { justify-content: center; text-align: center; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
}