* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: #050805;
  color: #fff;
  font-family: "Segoe UI", system-ui, sans-serif;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.accueil {
  position: relative;
  text-align: center;
  padding: 40px 24px;
  max-width: 460px;
}
.lueur {
  position: absolute;
  inset: -120px;
  background: radial-gradient(circle, rgba(0,255,120,.28), transparent 60%);
  filter: blur(30px);
  animation: pulse 4s ease-in-out infinite;
  z-index: -1;
}
.logo {
  width: 96px; height: 96px;
  margin: 0 auto 20px;
  border-radius: 28px;
  display: grid; place-items: center;
  font-size: 56px; font-weight: 800;
  color: #050805;
  background: linear-gradient(135deg, #00ff88, #00b35a);
  box-shadow: 0 0 40px rgba(0,255,136,.6);
  animation: flotte 3s ease-in-out infinite;
}
h1 { font-size: 3.4rem; margin: 0 0 10px; letter-spacing: 2px; }
h1 span { color: #00ff88; text-shadow: 0 0 20px #00ff88; }
.slogan { color: #9fbfae; font-size: 1.1rem; margin: 0 0 32px; }
button {
  font-size: 1.2rem; font-weight: 700;
  padding: 14px 44px;
  border: 2px solid #00ff88;
  border-radius: 999px;
  background: #00ff88; color: #050805;
  cursor: pointer;
  box-shadow: 0 0 24px rgba(0,255,136,.5);
  transition: transform .15s, box-shadow .15s, background .15s;
}
button:hover {
  transform: scale(1.07);
  box-shadow: 0 0 40px rgba(0,255,136,.9);
}
#message { margin-top: 22px; color: #00ff88; font-size: 1.2rem; min-height: 1.5em; }
@keyframes flotte { 50% { transform: translateY(-10px); } }
@keyframes pulse { 50% { opacity: .5; transform: scale(1.1); } }