:root {
  --blue-600: #4a90e2;
  --blue-500: #7db3e0;
  --blue-400: #a5c9e8;
  --gray-900: #2d3a4b;
  --gray-700: #4c5c6d;
  --bg: #f7fafc;
  --card: #ffffff;
  --muted: #7f8c8d;
  --accent: #e0f1ff;
  --max-width: 1200px;
  --radius: 8px;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--gray-900);
  line-height: 1.5;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 95%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.top-banner {
  background: linear-gradient(90deg, var(--blue-600), var(--blue-500));
  color: white;
  padding: 8px 0;
  text-align: center;
  font-size: 0.95rem;
}

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--gray-900);
}
.brand .logo {
  background: var(--accent);
  color: var(--blue-600);
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 1rem;
}
.tagline {
  font-size: 0.85rem;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 1rem;
}

.nav a {
  text-decoration: none;
  color: var(--gray-900);
  font-weight: 500;
}

.nav a.active {
  font-weight: 700;
  border-bottom: 2px solid var(--blue-600);
}

.nav-toggle {
  display: none;
  font-size: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
}

.hero {
  padding: 60px 0;
  background: linear-gradient(180deg, #ffffff 0%, var(--accent) 100%);
}
.hero .inner {
  display: grid;
  grid-template-columns: 1fr 506px;
  gap: 36px;
  align-items: center;
}
.hero h1 {
  font-size: 2rem;
  margin: 0 0 16px;
}
.hero p.lead {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 1.2rem;
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  background: var(--blue-600);
  color: white;
  padding: 12px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s ease;
}
.btn:hover {
  background: var(--blue-500);
}
.btn.secondary {
  background: transparent;
  color: var(--blue-600);
  border: 1px solid var(--accent);
}

.card {
  background: var(--card);
  padding: 18px;
  border-radius: var(--radius);
  box-shadow: 0 6px 18px rgba(20,30,60,0.06);
}
.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 8px 0;
  color: var(--muted);
}
.check-icon {
  min-width: 28px; height: 28px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--blue-600);
  display: inline-grid;
  place-items: center;
  font-weight: 700;
}

.section {
  padding: 40px 0;
}
.section h2 {
  margin: 0 0 12px;
  font-size: 1.4rem;
}

.info-section {
  text-align: center;
  padding: 40px 0;
}

form {
  background: var(--card);
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  max-width: 700px;
  margin: 0 auto;
}

form label {
  display: block;
  font-weight: 600;
  margin-top: 15px;
  margin-bottom: 5px;
  color: var(--gray-700);
}

form input, 
form textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

form input:focus, 
form textarea:focus {
  border-color: var(--blue-600);
  outline: none;
}

form small {
  color: var(--muted);
  display: block;
  margin-top: 8px;
  font-size: 0.85rem;
}
    .accordion { border-top: 1px solid #ddd; margin-top: 1rem; }
    .accordion-item { border-bottom: 1px solid #eee; }
    .accordion-header {
      background: none; border: none; width: 100%;
      text-align: left; padding: 1rem; font-weight: 600;
      font-size: 1rem; cursor: pointer;
      display: flex; justify-content: space-between; align-items: center;
    }
    .accordion-header:hover { background: #f9fbff; }
    .accordion-content {
      max-height: 0; overflow: hidden; opacity: 0;
      transition: all 0.3s ease; padding: 0 1rem;
    }
    .accordion-content.open { max-height: 2000px; opacity: 1; padding: 1rem; }

.site-footer {
  background: var(--gray-900);
  color: white;
  padding: 28px 0;
  margin-top: 36px;
  font-size: 0.9rem;
}

.site-footer a {
  color: #dcebfe;
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: flex-start;
  justify-content: space-between;
}

.footer-col {
  min-width: 160px;
}

.footer-col small.muted {
  color: #9ca3af;
}

hr.style-four {
  border: 0;height: 2px;
  background:linear-gradient(to right, transparent, skyblue, transparent);
  margin: 0.1rem 0;
}

.rentner-banner {
    position: fixed;
    top: 160px;
    left: 50%;
    transform: translateX(-50%);
    max-width: 640px;
    width: calc(100% - 32px);
    background: #f5f6f7;
    color: #1f1f1f;
    border: 1px solid #d6dbe0;
    border-radius: 14px;
    padding: 22px 24px 26px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    z-index: 9999;
    text-align: center;
    font-size: 1rem;
}

.rentner-banner h2 {
    margin: 0 0 10px;
    font-size: 1.45rem;
    font-weight: 600;
}

.rentner-banner p {
    margin: 0 0 18px;
    line-height: 1.5;
}

.rentner-mail-btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 999px;
    background: #1e2f45;
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s ease, transform 0.1s ease;
}

.rentner-mail-btn:hover {
    background: #243a55;
    transform: translateY(-1px);
}

.rentner-close {
    position: absolute;
    top: 10px;
    right: 14px;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #666;
    cursor: pointer;
}

.rentner-close:hover {
    color: #000;
}

@media (max-width: 980px) {
  .hero .inner { grid-template-columns: 1fr; }
  .nav { display: none; }
  .nav-toggle { display: block; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 1.5rem; }
  .btn { width: 100%; text-align: center; }
}

@media (max-width: 768px) {
  .nav {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 1px solid #ddd;
    padding: 1rem;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    z-index: 1000;

    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: max-height 0.4s ease, opacity 0.3s ease, transform 0.3s ease;
  }

  .nav.open {
    max-height: 400px;
    opacity: 1;
    transform: translateY(0);
  }

  .nav a {
    padding: 0.75rem 0;
    border-bottom: 1px solid #eee;
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }
}