:root {
  --bg: #ffffff;
  --card-blue: #eff2f8;   /* blue  */
  --card-green: #ddf2ed;  /* green */
  --card-red: #ece1f4;    /* red   */
  --card-yellow: #fff9e4; /* yellow */
  --text: #0f0f0f;
  --muted: #6b6b6b;
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #eee;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background: #000000;
  color: #ffffff;
}

/* Burger-Checkbox ausblenden (Standard) */
.nav-toggle {
  display: none;
}

/* Burger-Icon (Standard: versteckt, Mobile zeigt es über Media Query) */
.nav-burger {
  display: none;
  cursor: pointer;
  width: 28px;
  height: 22px;
  position: relative;
}

.nav-burger span {
  position: absolute;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--text);
  border-radius: 999px;
  transition: transform 0.2s ease, opacity 0.2s ease, top 0.2s ease, bottom 0.2s ease;
}

.nav-burger span:nth-child(1) { top: 0; }
.nav-burger span:nth-child(2) { top: 9px; }
.nav-burger span:nth-child(3) { bottom: 0; }

/* Zustand: geöffnet – Burger zu „X“ */
.nav-toggle:checked + .nav-burger span:nth-child(1) {
  top: 9px;
  transform: rotate(45deg);
}
.nav-toggle:checked + .nav-burger span:nth-child(2) {
  opacity: 0;
}
.nav-toggle:checked + .nav-burger span:nth-child(3) {
  bottom: 9px;
  transform: rotate(-45deg);
}

/* Mobile: Dropdown-Menü unter der Leiste */
@media (max-width: 700px) {
  .nav-inner {
    justify-content: space-between;
  }

  .nav-links {
    position: absolute;           /* unterhalb der Nav-Bar */
    top: 100%;
    left: 0;
    right: 0;
    background: #000000;
    color: #ffffff;
    list-style: none;
    margin: 0;
    padding: 1rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
    justify-content: flex-start;
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
    z-index: 999;
  }

  .nav-links a {
    color: #ffffff;
    font-size: 1.0rem;
    padding: 0.3rem 0;
    border-radius: 0;
    background: transparent;
  }

  /* Burger auf Mobile anzeigen */
  .nav-burger {
    display: block;
  }

  /* Menü anzeigen, wenn Checkbox aktiv */
  .nav-toggle:checked ~ .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  main { padding-top: 3rem; }
}

/* Desktop: Burger verstecken, normale Navi */
@media (min-width: 701px) {
  .nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    background: transparent;
  }

  .nav-burger,
  .nav-toggle {
    display: none;
  }
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 1.5rem 6rem;
}

section { margin-bottom: 6rem; }

h1 {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

p {
  color: var(--muted);
  max-width: 680px;
}

.hero p { font-size: 1.05rem; }

.cta {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  border: 1px solid var(--text);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.cta:hover {
  background: #000000;
  color: #ffffff;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

/* Basis-Card ohne feste Hintergrundfarbe */
.card {
  padding: 1rem;
  border-radius: var(--radius);
}

/* 4er-Zyklus: 1 blau, 2 grün, 3 rot, 4 gelb, dann wieder von vorne */
.card-grid .card:nth-child(4n + 1) {
  background: var(--card-blue);
}
.card-grid .card:nth-child(4n + 2) {
  background: var(--card-green);
}
.card-grid .card:nth-child(4n + 3) {
  background: var(--card-red);
}
.card-grid .card:nth-child(4n + 4) {
  background: var(--card-yellow);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.team-card strong {
  display: block;
  margin-top: 0.5rem;
}

.team-card span {
  font-size: 0.85rem;
  color: var(--muted);
}

footer {
  border-top: 1px solid #eee;
  padding: 3rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

input,
textarea {
  width: 100%;
  max-width: 480px;
  padding: 0.5rem;
  border-radius: 8px;
  border: 1px solid #ccc;
  font: inherit;
}