/* ===== Theme: Light (default) ===== */
:root {
  --bg-primary: #e2e8f0;
  --bg-secondary: #ffffff;
  --bg-section-alt: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-border: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --accent: #0ea5e9;
  --accent-hover: #0284c7;
  --border: #cbd5e1;
  --shadow: rgba(15, 23, 42, 0.08);
  --shadow-strong: rgba(15, 23, 42, 0.12);
  --focus-ring: #0ea5e9;
  --glass: rgba(255, 255, 255, 0.9);
  --glass-border: #cbd5e1;
}

/* ===== Theme: Dark (nur bei Aktivierung) ===== */
html.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-card-border: rgba(51, 65, 85, 0.8);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --border: rgba(51, 65, 85, 0.9);
  --shadow: rgba(0, 0, 0, 0.25);
  --focus-ring: #38bdf8;
  --glass: rgba(30, 41, 59, 0.8);
  --glass-border: rgba(51, 65, 85, 0.6);
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
}

/* Container – responsive Abstände */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 1.25rem);
}

/* Header – Glas-Effekt */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 1px 12px var(--shadow);
  overflow: visible;
}
@supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
  .header {
    background: var(--glass);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
  }
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem clamp(1rem, 5vw, 1.25rem);
  padding-right: max(clamp(1rem, 5vw, 1.25rem), env(safe-area-inset-right, 0px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
}
.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}
.brand:hover { color: var(--accent); }

/* Nav toggle (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text-primary);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}
@media (max-width: 768px) {
  .nav-toggle { display: flex; flex-shrink: 0; }
  .header-actions { display: none; }
  .header-inner { padding-left: max(clamp(1rem, 5vw, 1.25rem), env(safe-area-inset-left, 0px)); }
  .brand { font-size: 1.1rem; min-width: 0; }
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  @supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
    .nav {
      background: var(--glass);
      backdrop-filter: saturate(180%) blur(12px);
      -webkit-backdrop-filter: saturate(180%) blur(12px);
    }
  }
  .nav.is-open { max-height: 80vh; overflow-y: auto; }
  .nav-list {
    flex-direction: column;
    padding: 1rem max(1rem, 5vw) 1.5rem;
    padding-left: max(clamp(1rem, 5vw, 1.25rem), env(safe-area-inset-left, 0px));
    padding-right: max(clamp(1rem, 5vw, 1.25rem), env(safe-area-inset-right, 0px));
    gap: 0.25rem;
    align-items: stretch;
  }
  .nav-list > li > a {
    display: block;
    padding: 0.6rem 0;
  }
  .nav-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
  }
  .nav-ctas .btn {
    flex: 1 1 auto;
    min-width: 120px;
    text-align: center;
  }
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
}
.nav-list a:hover { color: var(--accent); }
.nav-ctas { display: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme toggle */
.theme-toggle {
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text-primary);
  position: relative;
  border-radius: 8px;
}
.theme-toggle:hover { background: var(--border); }
.theme-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  opacity: 0;
  transition: opacity 0.2s;
}
.theme-icon.sun { opacity: 1; }
html.dark .theme-icon.sun { opacity: 0; }
html.dark .theme-icon.moon { opacity: 1; }
.theme-icon::before {
  font-size: 1.25rem;
  line-height: 1;
}
.theme-icon.sun::before { content: "\263C"; }
.theme-icon.moon::before { content: "\263E"; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.btn:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: #fff; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }
@media (max-width: 480px) {
  .btn { padding: 0.6rem 1rem; min-height: 44px; }
  .btn-lg { padding: 0.75rem 1.25rem; min-height: 48px; }
}

/* Hero – leichter Glas-Container, Kontrast bleibt */
.hero {
  padding: clamp(2rem, 6vw, 4rem) 0;
  text-align: center;
  position: relative;
}
.hero .container {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1rem, 4vw, 1.5rem);
  box-shadow: 0 8px 32px var(--shadow);
}
html:not(.dark) .hero .container {
  border-color: var(--border);
  box-shadow: 0 4px 16px var(--shadow), 0 12px 40px var(--shadow-strong);
}
@supports (backdrop-filter: blur(16px)) or (-webkit-backdrop-filter: blur(16px)) {
  html.dark .hero .container {
    background: var(--glass);
    backdrop-filter: saturate(140%) blur(16px);
    -webkit-backdrop-filter: saturate(140%) blur(16px);
  }
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}
.hero-sub {
  margin: 0 0 2rem;
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
}
@media (max-width: 480px) {
  .hero-ctas .btn {
    width: 100%;
    max-width: 280px;
  }
}

/* Sections */
.section {
  padding: clamp(2rem, 5vw, 3rem) 0;
}
html:not(.dark) .section:not(.section-alt) {
  border-bottom: 1px solid var(--border);
}
html:not(.dark) .section:not(.section-alt):last-of-type {
  border-bottom: none;
}
.section-alt {
  background: var(--bg-secondary);
}
html:not(.dark) .section-alt {
  background: var(--bg-section-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
html.dark .section-alt {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.6) 0%, rgba(30, 41, 59, 0.95) 100%);
}
.section h2 {
  margin: 0 0 1rem;
  font-size: 1.75rem;
  font-weight: 700;
}
.section-lead {
  margin: 0 0 1.5rem;
  color: var(--text-secondary);
  max-width: 640px;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: clamp(1rem, 3vw, 1.5rem);
  margin-top: 1.5rem;
}
@media (max-width: 380px) {
  .cards { grid-template-columns: 1fr; }
}
.card {
  padding: clamp(1rem, 3vw, 1.5rem);
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 16px;
  box-shadow: 0 4px 20px var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
html:not(.dark) .card {
  box-shadow: 0 2px 8px var(--shadow), 0 8px 24px var(--shadow-strong);
}
@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  html.dark .card {
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
  }
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--shadow);
}
html:not(.dark) .card:hover {
  box-shadow: 0 4px 12px var(--shadow), 0 12px 32px var(--shadow-strong);
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.125rem; color: var(--text-primary); }
.card p { margin: 0 0 1rem; color: var(--text-secondary); font-size: 0.9375rem; }
.card-link {
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
.card-link:hover { text-decoration: underline; }

/* Contact */
.contact-block {
  margin-bottom: 1.5rem;
}
.contact-block a { color: var(--accent); text-decoration: none; }
.contact-block a:hover { text-decoration: underline; }

.contact-form {
  max-width: 480px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.contact-form label {
  font-weight: 500;
  font-size: 0.9375rem;
}
.contact-form input,
.contact-form textarea {
  padding: 0.6rem 0.75rem;
  font: inherit;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--focus-ring);
}
.contact-form .honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

/* Footer – dezenter Glas-Look */
.footer {
  padding: clamp(1.5rem, 4vw, 2rem) clamp(1rem, 5vw, 1.25rem);
  padding-bottom: max(clamp(1.5rem, 4vw, 2rem), env(safe-area-inset-bottom, 0px));
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  text-align: center;
}
@supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
  .footer {
    background: var(--glass);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
  }
}
.footer .container {
  padding-left: clamp(1rem, 5vw, 1.25rem);
  padding-right: clamp(1rem, 5vw, 1.25rem);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.25rem;
  margin-bottom: 1rem;
}
@media (max-width: 480px) {
  .footer-links {
    gap: 0.6rem 1rem;
    font-size: 0.9rem;
  }
}
.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
}
.footer-links a:hover { color: var(--accent); }
.footer-copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Rechteseiten (Impressum, Datenschutz, AGB) */
.page-content {
  max-width: 720px;
}
.page-content h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
}
.page-content h2:first-child {
  margin-top: 0;
}
.page-content p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}
.page-content a {
  color: var(--accent);
  text-decoration: none;
}
.page-content a:hover {
  text-decoration: underline;
}
@media (max-width: 480px) {
  .page-content h2 { font-size: 1.125rem; }
  .section .container { padding-left: clamp(1rem, 5vw, 1.25rem); padding-right: clamp(1rem, 5vw, 1.25rem); }
}