:root {
  --bg: #ffffff;
  --text: #0b0b0c;
  --muted: #5a5f6a;
  --card: #f5f7fb;
  --accent: #3b82f6;
  --accent-contrast: #ffffff;
  --border: #e5e7eb;
  --ring: rgba(59, 130, 246, 0.4);
  /* toggle sizing variables */
  --nav-toggle-size: 2.25rem;
  --theme-toggle-size: 2.25rem;
}

[data-theme="dark"] {
  --bg: #181c24;
  --text: #e6eaf3;
  --muted: #a3adc2;
  --card: #232837;
  --accent: #7dd3fc;
  --accent-contrast: #181c24;
  --border: #2d3344;
  --ring: rgba(125, 211, 252, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

.skip-link {
  position: absolute; left: -9999px; top: auto;
}
.skip-link:focus {
  left: 1rem; top: 1rem; background: var(--accent); color: var(--accent-contrast);
  padding: .5rem .75rem; border-radius: .5rem; z-index: 1000;
}

.site-header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(120%) blur(6px);
  background: color-mix(in hsl, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; gap: 1rem;
  max-width: 1100px; margin: 0 auto; padding: .75rem 1rem;
}
.brand { font-weight: 800; letter-spacing: .2px; text-decoration: none; color: var(--text); font-size: 1.15rem; }
.brand span { color: var(--accent); }

.menu { display: flex; gap: 1rem; list-style: none; margin-left: auto; padding: 0; }
.menu a { text-decoration: none; color: var(--text); padding: .5rem .75rem; border-radius: .5rem; }
.menu a:focus, .menu a:hover { background: var(--card); }

.nav-toggle {
  display: none;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  width: var(--nav-toggle-size);
  height: var(--nav-toggle-size);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
  position: relative;
  box-shadow: 0 4px 18px 0 rgba(24,28,36,0.13);
  padding: 0;
  outline: none;
}
.nav-toggle:focus, .nav-toggle:hover {
  background: var(--accent-contrast);
  box-shadow: 0 6px 24px 0 rgba(24,28,36,0.18);
  transform: scale(1.07);
}
.nav-toggle:focus, .nav-toggle:hover {
  background: var(--accent-contrast);
  outline: none;
}
.nav-toggle-dot {
  display: block;
  width: 0.5rem;
  height: 0.5rem;
  background: #232837;
  border-radius: 50%;
  margin: 0.38rem auto;
  box-shadow: 0 1px 4px 0 rgba(24,28,36,0.10);
  transition: transform 0.18s cubic-bezier(.4,1.4,.6,1), background 0.2s;
}
[data-theme="dark"] .nav-toggle-dot {
  background: #fff;
}
.nav-toggle:hover .nav-toggle-dot:nth-child(1) {
  transform: translateY(-2px) scale(1.15);
}
.nav-toggle:hover .nav-toggle-dot:nth-child(3) {
  transform: translateY(2px) scale(1.15);
}
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
}

.theme-toggle {
  margin-left: auto;
  border: 1px solid var(--border);
  background: var(--card);
  width: var(--theme-toggle-size); height: var(--theme-toggle-size); border-radius: .6rem; cursor: pointer;
}

main { max-width: 1100px; margin: 0 auto; padding: 2rem 1rem 3rem; }

.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
  margin-bottom: 4.5rem;
  overflow: visible;
}
.hero-art {
  position: absolute;
  top: -60px;
  left: 0;
  width: 100%;
  height: calc(100% + 120px);
  z-index: 0;
  object-fit: cover;
  opacity: 0.85;
  pointer-events: none;
  /* Reserve intrinsic aspect ratio (SVG viewBox 800x600 => 4/3) to avoid layout shifts */
  aspect-ratio: 4 / 3;
}
.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
  background: rgba(24,28,36,0.60);
  border-radius: 1.2rem;
  padding: 2.5rem 2rem 2rem 2rem;
  box-shadow: 0 4px 32px 0 rgba(24,28,36,0.10);
  color: #e6eaf3;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.hero-copy h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  margin: 0 0 .75rem;
  color: #fff;
  text-shadow: 0 2px 16px rgba(24,28,36,0.18);
}
.cta { display: flex; gap: .75rem; margin-top: 1rem; }

.features {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.section-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  text-align: center;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
  justify-items: center;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1.1rem;
  padding: 2rem 1.2rem 1.5rem 1.2rem;
  box-shadow: 0 2px 16px 0 rgba(24,28,36,0.06);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform 0.15s, box-shadow 0.15s;
}
.feature-card:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 6px 32px 0 rgba(24,28,36,0.10);
}
.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
  line-height: 1;
}
.brand-inline { color: var(--accent); font-weight: 700; }

.callout { margin-top: 3rem; padding: 1.25rem 1rem; border: 1px dashed var(--border); border-radius: .8rem; background: color-mix(in hsl, var(--card) 70%, transparent); }

.prose h1 { margin-top: 0; }
.prose code { background: var(--card); padding: .1rem .3rem; border-radius: .3rem; border: 1px solid var(--border); }

.form { max-width: 560px; }
.field { display: grid; gap: .25rem; margin-bottom: 1rem; }
input, textarea {
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  padding: .65rem .75rem; border-radius: .6rem; outline: none;
}
input:focus, textarea:focus {
  border-color: var(--accent); box-shadow: 0 0 0 .25rem var(--ring);
}
.error { color: #b91c1c; min-height: 1.25rem; }


.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .65rem .9rem; border-radius: .6rem; text-decoration: none; cursor: pointer;
  border: 1px solid var(--accent);
  background: #222; /* deutlich dunkler für besseren Kontrast */
  color: #fff;
  transition: background 0.2s, color 0.2s;
}
.btn.primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
}
.btn:focus, .btn:hover {
  background: #0057b8; /* kräftiges Blau für Fokus/Hover */
  color: #fff;
  outline: none;
  box-shadow: 0 0 0 .25rem var(--ring);
}

.site-footer {
  border-top: 1px solid var(--border); padding: 1rem; text-align: center; color: var(--muted);
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  /* Keep the menu positioned so toggling it won't affect document flow.
     Use opacity/visibility/transform to show/hide instead of display to avoid forced reflows. */
  .menu {
    display: grid;
    margin-left: 0;
    grid-auto-rows: min-content;
    gap: .25rem;
    position: absolute;
    top: 3.25rem;
    right: 1rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: .8rem;
    padding: .5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
    pointer-events: none;
    will-change: opacity, transform;
  }
  /* Ensure nav is flex and controls are laid out so the toggle sits at the far right */
  .nav { display: flex; align-items: center; gap: 1rem; }
  /* make nav-toggle match theme-toggle size on mobile and sit flush to the right */
  .nav-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    background: var(--card);
    width: var(--nav-toggle-size);
    height: var(--nav-toggle-size);
    padding: 0;
    border-radius: .6rem;
    margin-left: auto;
    align-items: center;
    justify-content: center;
  }
  /* Prevent theme-toggle's auto margin from causing layout shifts on small screens */
  .theme-toggle { order: 3; margin-left: 0; }
  .menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  /* Give the hero copy breathing room on small screens so headings don't touch the edge */
  .hero-copy {
    margin: 0 1rem;
    padding: 1.5rem 1rem; /* reduce padding so it fits comfortably */
    max-width: calc(100% - 2rem);
    box-sizing: border-box;
  }
}