:root {
  /* Grundfarben */
  --background: #f5f6fa;
  --text: #1f2937;
  --muted: #6b7280;
  --white: #ffffff;

  /* Ruhige Basis */
  --deep-blue: #2b365f;
  --soft-blue: #e9ecf8;

  /* CAELUM Orange */
  --caelum-orange: #e07a2f;
  --caelum-orange-soft: #fbeee3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
}

/* Header */
header {
  padding: 3.5rem 1.5rem;
  background: linear-gradient(160deg, var(--deep-blue), #4a5fa8);
  color: var(--white);
  text-align: center;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 38rem;
  margin: 0 auto;
}

/* Sections */
section {
  padding: 3rem 1.5rem;
  max-width: 60rem;
  margin: 0 auto;
}

section h2 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
  color: var(--deep-blue);
}

section p {
  max-width: 42rem;
  margin-bottom: 1rem;
}

/* Cards */
.card {
  background: var(--white);
  border-radius: 14px;
  padding: 1.75rem;
  margin-top: 1.5rem;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
}

/* CAELUM Bereich */
.card.caelum {
  background: linear-gradient(
    180deg,
    var(--white),
    var(--caelum-orange-soft)
  );
  border-left: 4px solid var(--caelum-orange);
}

/* Links */
.link {
  display: inline-block;
  margin-top: 0.5rem;
  text-decoration: none;
  font-weight: 500;
}

.link:hover {
  text-decoration: underline;
}

/* CAELUM Links */
.caelum-link {
  color: var(--caelum-orange);
}

/* Footer */
footer {
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

/* Responsive */
@media (min-width: 768px) {
  header h1 {
    font-size: 2.6rem;
  }

  section h2 {
    font-size: 2rem;
  }
}