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

body {
  font-family: system-ui, sans-serif;
  min-height: 100vh;
  color: #1e293b;
  overflow: hidden;
  position: relative;
  transition: background 0.5s ease, color 0.5s ease;
}

/* CANVAS PARTICULES */
#background-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
}

/* STRUCTURE PAGE */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 40px;
  padding: 60px 20px;
}

/* HERO */
.hero {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.hero p {
  color: #475569;
  line-height: 1.5;
  transition: color 0.5s ease;
}

/* CARD GENERATEUR */
.card {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(15px);
  border-radius: 24px;
  padding: 50px;
  max-width: 600px;
  margin: 0 auto;
  box-shadow: 0 40px 70px rgba(0,0,0,0.4);
  text-align: center;
  transition: background 0.5s ease;
}

/* BOUTONS */
button {
  cursor: pointer;
  transition: transform 0.15s ease;
}

button.generate {
  width: 100%;
  padding: 18px;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 14px;
  border: none;
  background: #3b82f6;
  color: white;
}

button.generate:hover {
  transform: translateY(-1px);
}

#password-box {
  margin-top: 28px;
  padding: 24px;
  border-radius: 16px;
  background: rgba(0,0,0,0.25);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#password {
  font-family: monospace;
  font-size: 1.5rem;
  font-weight: bold;
}

button.copy {
  padding: 12px;
  border-radius: 12px;
  border: none;
  background: #64748b;
  color: white;
}

#message {
  margin-top: 16px;
  font-size: 0.9rem;
  color: #16a34a;
}

/* ZONE PUB */
.ad-zone {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.ad-label {
  font-size: 0.75rem;
  color: #94a3b8;
  margin-bottom: 6px;
  display: block;
}

.ad-placeholder {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 24px;
  color: #94a3b8;
  border: 1px dashed rgba(255,255,255,0.25);
}

/* FOOTER */
.footer {
  text-align: center;
  font-size: 0.85rem;
  color: #94a3b8;
}

/* MODE JOUR / NUIT */
body.day { color: #1e293b; }
body.night { color: #f1f5f9; }

.hero.day p { color: #475569; }
.hero.night p { color: #cbd5e1; }

.card.day { background: rgba(255,255,255,0.15); }
.card.night { background: rgba(30,41,59,0.9); }

/* RESPONSIVE */
@media (max-width: 480px) {
  .card { padding: 40px 20px; }
  .hero h1 { font-size: 2rem; }
  #password { font-size: 1.3rem; }
}