:root {
  --font-headline: 'Outfit', 'Poppins', Arial, sans-serif;
  --font-system:   'Inter', -apple-system, system-ui, Arial, sans-serif;

  --text-caption1:    12px;
  --text-footnote:    13px;
  --text-subhead:     15px;
  --text-body:        17px;
  --text-title3:      20px;
  --text-title2:      22px;
  --text-title1:      28px;
  --text-large-title: 34px;
  --text-display:     48px;
  --text-condensed-xl: 56px;

  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  --institut-green:       #1E9E5C;
  --institut-green-hover: #17824B;
  --institut-green-tint:  rgba(30,158,92,0.08);

  --ink:      #16231C;
  --grey-44:  #66716B;
  --grey-86:  #DCE8E0;
  --grey-96:  #EEF5F0;
  --bg-page:      #F5FAF7;
  --bg-surface:   #FFFFFF;
  --bg-inset:     var(--grey-96);

  --text-primary:   var(--ink);
  --text-secondary: rgba(22,35,28,0.65);
  --text-muted:     rgba(22,35,28,0.50);
  --text-tertiary:  rgba(22,35,28,0.40);
  --text-inverse:   #FFFFFF;

  --border:          var(--grey-86);
  --border-hairline: rgba(22,35,28,0.07);
  --border-divider:  rgba(22,35,28,0.05);

  --color-warning: #F2A93B;
  --color-info:    var(--ink);

  --radius-sm:  10px;
  --radius-md:  14px;
  --radius-lg:  18px;
  --radius-xl:  22px;
  --radius-2xl: 28px;
  --radius-none: 0;
  --radius-full: 9999px;

  --hover-state:   rgba(22,35,28,0.04);
  --pressed-state: rgba(22,35,28,0.08);
  --focus-ring:    var(--institut-green);

  --shadow-xs: 0 1px 2px rgba(22,35,28,0.05);
  --shadow-sm: 0 2px 8px rgba(22,35,28,0.07), 0 1px 3px rgba(22,35,28,0.04);
  --shadow-md: 0 4px 16px rgba(22,35,28,0.09), 0 2px 6px rgba(22,35,28,0.04);
  --shadow-lg: 0 8px 32px rgba(22,35,28,0.11), 0 4px 12px rgba(22,35,28,0.05);

  --ease-spring: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out:    cubic-bezier(0, 0, 0.2, 1);
  --dur-instant: 100ms;
  --dur-fast:    200ms;
  --dur-normal:  300ms;
}

.dark, [data-theme="dark"] {
  --bg-page:      #0E1712;
  --bg-surface:   #17221C;
  --bg-inset:     #26332B;

  --text-primary:   #FFFFFF;
  --text-secondary: rgba(235,245,240,0.6);
  --text-muted:     rgba(235,245,240,0.4);
  --text-tertiary:  rgba(235,245,240,0.28);

  --border:          rgba(255,255,255,0.12);
  --border-hairline: rgba(255,255,255,0.1);
  --border-divider:  rgba(255,255,255,0.07);

  --hover-state:   rgba(255,255,255,0.06);
  --pressed-state: rgba(255,255,255,0.10);

  --ink: #FFFFFF;
  --text-inverse: #16231C;
  --institut-green: #34C67F;
  --institut-green-tint: rgba(52,198,127,0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-system);
  font-size: var(--text-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: inherit; }
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--institut-green);
  border-radius: var(--radius-sm);
}

/* ── Typography ── */
.eyebrow {
  font-family: var(--font-system);
  font-weight: 600;
  font-size: var(--text-caption1);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--institut-green);
}
.display {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(34px, 6vw, var(--text-condensed-xl));
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--text-primary);
  margin: var(--space-4) 0 var(--space-5);
}
.display .accent { color: var(--institut-green); }
.title2 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--text-title2);
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
}
.title-large {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: var(--text-large-title);
  margin: var(--space-2) 0 0;
  color: var(--text-primary);
}
.lede {
  font-size: var(--text-title3);
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 62ch;
  line-height: 1.5;
}
.body-text {
  color: var(--text-secondary);
  max-width: 65ch;
}
.quiet {
  font-family: var(--font-system);
  font-weight: 300;
  color: var(--text-muted);
  font-size: var(--text-footnote);
}

/* ── Buttons ── */
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-system);
  font-weight: 600;
  font-size: var(--text-subhead);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  text-decoration: none;
  min-height: 44px;
  transition: transform var(--dur-instant) var(--ease-out), opacity var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--ink); color: var(--text-inverse); }
.btn-primary:hover { opacity: 0.88; }
.btn-primary:active { transform: scale(0.97); }
.btn-secondary { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--hover-state); }
.btn-secondary:active { transform: scale(0.97); }

/* ── Nav ── */
.topbar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg-page) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-hairline);
}
.brand {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: var(--text-title3);
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.brand .accent { color: var(--institut-green); }
.brand img { display: block; }
.topbar-links { display: none; gap: var(--space-6); }
.topbar-link {
  font-family: var(--font-system);
  font-weight: 400;
  font-size: var(--text-subhead);
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
}
.topbar-link:hover { color: var(--text-primary); }
.topbar-actions { display: flex; align-items: center; gap: var(--space-3); }
@media (min-width: 860px) {
  .topbar-links { display: flex; }
}

.theme-toggle {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 16px;
  box-shadow: var(--shadow-xs);
}

/* ── Sections ── */
section { padding: var(--space-24) 0; }
.hero { padding-top: var(--space-16); padding-bottom: var(--space-20); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

.section-alt { background: var(--bg-surface); border-top: 1px solid var(--border-hairline); border-bottom: 1px solid var(--border-hairline); }

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-top: var(--space-10);
}
@media (min-width: 780px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
}
.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.step-num {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: var(--text-title2);
  color: var(--institut-green);
  display: block;
  margin-bottom: var(--space-3);
}
.step-card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--text-title3);
  margin: 0 0 var(--space-2);
  color: var(--text-primary);
}
.step-card p { margin: 0; color: var(--text-secondary); font-size: var(--text-subhead); }

.principle {
  border-radius: var(--radius-none);
  border-left: 4px solid var(--color-info);
  background: var(--bg-surface);
  padding: var(--space-6) var(--space-6);
  margin-top: var(--space-8);
  max-width: 68ch;
}
.principle strong {
  display: block;
  font-family: var(--font-headline);
  font-size: var(--text-title3);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.principle p { margin: 0; color: var(--text-secondary); }

/* Prominenter Pilotphasen-CTA im Hero: der eine Bold-Moment der Seite, grüner Button auf Ink. */
.cta-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  background: var(--ink);
  color: var(--text-inverse);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  margin-top: var(--space-10);
}
@media (min-width: 780px) {
  .cta-panel { flex-direction: row; align-items: center; justify-content: space-between; gap: var(--space-8); }
}
.cta-panel p {
  margin: 0;
  color: var(--text-inverse);
  font-size: var(--text-subhead);
  font-weight: 600;
  line-height: 1.55;
  max-width: 56ch;
}
.cta-panel .btn-primary {
  background: var(--institut-green);
  color: var(--ink);
  flex-shrink: 0;
  white-space: nowrap;
}
.cta-panel .btn-primary:hover { background: var(--institut-green-hover); color: var(--text-inverse); }

/* Schlichter Schluss-CTA am Seitenende, im normalen Seiten-Look. */
.cta-closing {
  text-align: center;
}
.cta-closing p {
  margin: 0 0 var(--space-5);
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--text-large-title);
  color: var(--text-primary);
}

.audience-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-10);
}
@media (min-width: 780px) {
  .audience-grid { grid-template-columns: repeat(2, 1fr); }
}
.audience-card {
  background: var(--bg-inset);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.audience-card h3 {
  font-family: var(--font-headline);
  font-size: var(--text-title3);
  font-weight: 700;
  margin: 0 0 var(--space-2);
}
.audience-card p { margin: 0; color: var(--text-secondary); font-size: var(--text-subhead); }

/* Gründer-Team */
.team-card {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
  margin-top: var(--space-10);
  flex-wrap: wrap;
}
.team-photo {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  background: var(--bg-inset);
  color: var(--text-tertiary);
  flex: 0 0 auto;
  overflow: hidden;
}
.team-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.team-card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--text-title2);
  margin: 0 0 var(--space-1);
  color: var(--text-primary);
}

footer {
  border-top: 1px solid var(--border-hairline);
  padding: var(--space-12) 0 var(--space-16);
}
.footer-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
@media (min-width: 780px) {
  .footer-grid { flex-direction: row; justify-content: space-between; align-items: flex-start; }
}
.footer-links { display: flex; gap: var(--space-5); flex-wrap: wrap; }
.footer-links a { text-decoration: none; color: var(--text-secondary); font-size: var(--text-subhead); }
.footer-links a:hover { color: var(--text-primary); }

/* Fächer-Interesse-Formular (Für-wen-Section) */
.interest-form {
  margin-top: var(--space-6);
  max-width: 480px;
}
.interest-checkboxes {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-subhead);
  color: var(--text-primary);
  cursor: pointer;
}
.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--institut-green);
}
.interest-email-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.interest-email-row input[type="email"] {
  flex: 1;
  min-width: 220px;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-system);
  font-size: var(--text-subhead);
  background: var(--bg-surface);
  color: var(--text-primary);
  box-sizing: border-box;
}
.interest-email-row input[type="email"]:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--institut-green);
}

/* ── Einfache Textseiten (Impressum, Datenschutz) ── */
.legal-page main { max-width: 760px; }
.legal-page .body-text { max-width: none; }
.legal-page h2 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--text-title2);
  margin: var(--space-10) 0 var(--space-3);
}
.legal-page h2:first-of-type { margin-top: var(--space-6); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}