/* =========================
   Modernes Responsive Design
========================= */

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

:root {

  /* Farbpalette */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --background: #f5f7fb;
  --surface: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;

  /* Schatten */
  --shadow: 0 8px 25px rgba(0,0,0,0.08);

  /* Rundungen */
  --radius: 16px;
}

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
}

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

header {
  background: var(--surface);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: auto;
  padding: 16px 24px;

  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

/* Logo */

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

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

nav ul {
  list-style: none;

  display: flex;
  align-items: center;
  gap: 18px;
}

nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: 0.25s ease;
  padding: 8px 14px;
  border-radius: 10px;
}

nav a:hover,
nav a:focus {
  background: #eff6ff;
  color: var(--primary);
}

/* =========================
   Suchfeld
========================= */

.search-box {
  display: flex;
  gap: 10px;
}

.search-box input {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  min-width: 220px;
}

.search-box input:focus {
  border-color: var(--primary);
}

/* =========================
   Buttons
========================= */

.btn {
  padding: 10px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  transition: 0.25s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: #eff6ff;
  color: var(--primary);
}

.btn-secondary:hover {
  background: #dbeafe;
}

/* =========================
   Hauptbereich
========================= */

main {
  max-width: 1200px;
  margin: 50px auto;
  padding: 0 24px;
}

/* Hero Section */

.hero {
  background: linear-gradient(
          135deg,
          #2563eb,
          #3b82f6
  );

  color: white;
  padding: 80px 40px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow);

  margin-bottom: 50px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.hero p {
  max-width: 800px;
  margin: auto;
  font-size: 1.1rem;
}

/* =========================
   Karten / Inhalte
========================= */

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
}

.card h2 {
  margin-bottom: 14px;
  color: var(--primary);
}

.card p {
  color: var(--text-light);
}

/* =========================
   Footer
========================= */

footer {
  margin-top: 80px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.footer-container {
  max-width: 1200px;
  margin: auto;
  padding: 24px;

  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

footer a {
  text-decoration: none;
  color: var(--text-light);
  transition: 0.25s ease;
}

footer a:hover {
  color: var(--primary);
}

/* =========================
   Accessibility
========================= */

a:focus,
button:focus,
input:focus {
  outline: 3px solid #93c5fd;
  outline-offset: 2px;
}

/* =========================
   Responsive Design
========================= */

/* Tablet */

@media (max-width: 900px) {

  .header-container {
    flex-direction: column;
    align-items: stretch;
  }

  nav ul {
    justify-content: center;
    flex-wrap: wrap;
  }

  .search-box {
    justify-content: center;
  }

  .hero h1 {
    font-size: 2.3rem;
  }
}

/* Smartphone */

@media (max-width: 600px) {

  .hero {
    padding: 50px 25px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  nav ul {
    flex-direction: column;
    gap: 10px;
  }

  .search-box {
    flex-direction: column;
  }

  .search-box input {
    width: 100%;
    min-width: unset;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}