site-mva-global-fret/css/parallax.css

/* =========================================================================
   PARALLAX INTRO — MVA Global Fret
   Page unique. Photo aérienne d'Antananarivo en fond + avion 3D piloté
   par la souris (entre par le haut-gauche, sort par la droite). Bouton
   CTA doré centré, toujours visible.
   ========================================================================= */

:root {
  --navy: #1a1a3e;
  --navy-deep: #050518;
  --gold: #c5a55a;
  --gold-light: #e0c98a;
  --red: #ff2a3d;
  --white: #fff;
  --mx: 0;
  --my: 0;
}

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

html, body {
  height: 100%;
  background: var(--navy-deep);
}

.parallax-body {
  font-family: 'Inter', sans-serif;
  color: var(--white);
  overflow: hidden;
}

/* ── HEADER ─────────────────────────────────────────────────────────────── */
.parallax-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 36px;
  z-index: 100;
}

.parallax-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  letter-spacing: 1.2px;
  font-size: 0.92rem;
  text-transform: uppercase;
  user-select: none;
}
.parallax-logo img {
  height: 44px;
  width: auto;
  filter: drop-shadow(0 4px 14px rgba(0, 0, 0, 0.65));
}

.lang-switcher {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50px;
  padding: 4px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.lang-switcher button {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  padding: 6px 14px;
  cursor: pointer;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.78rem;
  font-family: inherit;
  transition: all 0.2s;
}
.lang-switcher button.active {
  background: var(--gold);
  color: var(--navy);
}
.lang-switcher button:hover:not(.active) { color: var(--white); }

/* ── STAGE ──────────────────────────────────────────────────────────────── */
.stage {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  will-change: transform;
}

/* Photo de fond — léger zoom + parallaxe souris discrète */
.layer-bg {
  object-fit: cover;
  object-position: center;
  transform: translate(calc(var(--mx) * -16px), calc(var(--my) * -10px)) scale(1.05);
}

.layer-tint {
  background:
    radial-gradient(ellipse at center, transparent 0%, rgba(5, 5, 24, 0.32) 100%),
    linear-gradient(180deg, transparent 55%, rgba(5, 5, 24, 0.40) 100%);
}

.layer-three { display: block; z-index: 2; }

/* ── BOUTON CTA centré ────────────────────────────────────────────────────
   Visible immédiatement au chargement, parfaitement centré, sans animation. */
.cta-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 22px 56px;
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 50%, var(--gold) 100%);
  color: var(--navy);
  text-decoration: none;
  border-radius: 50px;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.6px;
  overflow: hidden;
  white-space: nowrap;
  box-shadow:
    0 20px 60px rgba(197, 165, 90, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.cta-btn:hover {
  transform: translate(-50%, -50%) scale(1.04);
  box-shadow:
    0 28px 75px rgba(197, 165, 90, 0.7),
    inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.cta-btn-shine {
  position: absolute;
  top: 0; left: -120%;
  width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.65), transparent);
  transform: skewX(-22deg);
  transition: left 0.7s ease;
  pointer-events: none;
}
.cta-btn:hover .cta-btn-shine { left: 130%; }

.cta-btn i {
  font-size: 0.95rem;
  transition: transform 0.32s ease;
}
.cta-btn:hover i { transform: translateX(8px); }

/* ── RESPONSIVE ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .parallax-header { padding: 14px 18px; }
  .parallax-logo span { display: none; }
  .parallax-logo img { height: 38px; }
  .lang-switcher button { padding: 5px 10px; font-size: 0.74rem; }

  .cta-btn {
    padding: 16px 36px;
    font-size: 0.98rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cta-btn::after { animation: none; }
}