/* =====================
   Variablen & Basis
   ===================== */
:root {
  --bubble-gutter: clamp(2rem, 2.5vw, 24px);

  /* Glas-/Bubble-Look */
  --glass-bg:
    radial-gradient(40% 40% at 50% 52%, rgba(255, 255, 255, 0.85) 0%, rgba(255, 255, 255, 0.55) 55%, rgba(255, 255, 255, 0) 70%),
    radial-gradient(120% 120% at 30% 30%, #ffffff 0%, #eef7ff 40%, #dbeeff 70%, #cfe6ff 100%);
  --glass-border: 2px solid rgba(70, 130, 180, 0.35);
  --glass-shadow:
    inset 0 2px 8px rgba(255, 255, 255, 0.9),
    inset 0 -10px 20px rgba(70, 130, 180, 0.18),
    0 10px 24px rgba(17, 63, 102, 0.22);
  --text-color: #0f2542;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(to top, #87ceeb 0%, #b0e0e6 50%, #ffffff 100%);
  font-family: sans-serif;
  overflow-x: hidden;

  /* Sticky-Footer Layout */
  display: flex;
  flex-direction: column;
}

/* =====================
   Header / Navigation
   ===================== */

/* Header-Leiste: Logo links, Navi zentriert, scrollt mit */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 32px 0;
  background: rgba(255,255,255,0.4);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

/* Logo: NICHT mehr fixed – scrollt mit */
.logo {
  position: static;     /* <-- wichtig */
  top: auto; left: auto;
  height: 80px;
  z-index: auto;
  flex-shrink: 0;
}

/* Navbar Desktop: zentriert */
.navbar {
  margin-top: 0;
  display: flex;
  justify-content: center;   /* zentriert */
  align-items: center;
  gap: 50px;
  flex: 1 1 auto;            /* nutzt den Platz rechts vom Logo */
  z-index: 1280;
}

/* Hamburger */
.hamburger {
  display: none;
  position: relative;
  width: 32px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1290;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 4px;
  margin: 5px 0;
  background: #1e3f66;
  border-radius: 2px;
  transition: transform 0.3s, background 0.3s, opacity 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); background: #ff4500; }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); background: #ff4500; }

/* Nav-Items (Blasen Desktop) */
.nav-item {
  width: 140px;
  height: 135px;
  border-radius: 50%;
  padding: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: #0f2542;
  font-weight: bold;
  font-size: 22px;
  text-decoration: none;
  line-height: 1.2;
  -webkit-text-stroke: 0.4px rgba(255, 255, 255, 0.55);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7), 0 0 6px rgba(15, 37, 66, 0.22);
  background: var(--glass-bg);
  border: var(--glass-border);
  box-shadow:
    inset 0 2px 8px rgba(255, 255, 255, 0.9),
    inset 0 -10px 20px rgba(70, 130, 180, 0.18),
    0 10px 25px rgba(17, 63, 102, 0.25);
  animation: float 6s ease-in-out infinite;
  transition: transform .2s ease, color .2s ease;
}
.nav-item:hover,
.nav-item:focus { color: #ff4500; transform: translateY(-4px); }
.nav-item::before,
.nav-item::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.nav-item::before {
  width: 55%;
  height: 55%;
  top: 9%;
  left: 14%;
  background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.35) 60%, rgba(255, 255, 255, 0) 100