:root {
  --blue: #0b5cff;
  --blue-dark: #053bb0;
  --overlay: rgba(0, 32, 128, 0.55);
  --text: #ffffff;
  --bg: #0f1b3d;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

/* Image du monsieur */
.hero {
  position: relative;
  min-height: 55vh;
  background:
    linear-gradient(var(--overlay), var(--overlay)),
    url('https://images.unsplash.com/photo-1522202176988-66273c2fd55f?q=80&w=1200&auto=format&fit=crop') center/cover no-repeat;
}

/* Centrage du bloc de bienvenue */
.overlay {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;   /* vertical */
  justify-content: center; /* horizontal */
}

.welcome {
  text-align: center;
  padding: 24px;
  max-width: 600px;
}
.welcome h1 {
  font-size: 2.6em;
  font-weight: 800;
  margin-bottom: 16px;
}
.welcome p {
  font-size: 1.3em;
  line-height: 1.6;
}

/* Barre de connexion */
.auth-bar {
  position: fixed;
  top: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(5, 59, 176, 0.8);
  padding: 8px 10px;
  border-radius: 10px;
  backdrop-filter: blur(6px);
  z-index: 1000;
}
.auth-logo {
  width: 32px; height: 32px; border-radius: 6px; object-fit: cover;
  border: 1px solid rgba(255,255,255,0.3);
}
.auth-bar button {
  all: unset;
  background: var(--blue);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}
.auth-bar button.primary { background: var(--blue-dark); }
.auth-bar button:hover { filter: brightness(1.1); }

/* Menu principal */
.main-nav {
  position: sticky;
  top: 0;
  background: rgba(5, 59, 176, 0.9);
  backdrop-filter: blur(6px);
  padding: 8px 12px;
  display: none;
}
.main-nav.show { display: block; }
.main-nav ul {
  display: flex; flex-wrap: wrap; gap: 8px;
  list-style: none; margin: 0; padding: 0;
}
.main-nav a, .main-nav .link {
  color: var(--text); text-decoration: none;
  padding: 6px 10px; border-radius: 8px; background: rgba(11,92,255,0.25);
  border: 1px solid rgba(255,255,255,0.15);
  cursor: pointer;
}
.main-nav a:hover, .main-nav .link:hover { background: rgba(11,92,255,0.45); }

/* Contenu masqué avant connexion */
.content {
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px;
}
.content.hidden {
  display: none;
}
.content section {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}