:root {
  --text: #15191d;
  --muted: #5f6972;
  --line: #dfe4e8;
  --soft: #f6f8f9;
  --white: #ffffff;
  --accent: #42a9d6;
  --accent-2: #b9b39d;
  --accent-soft: #eef8fc;
  --button-text: #ffffff;
  --max: 980px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--white);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
body.ruhr {
  --accent: #00aeb8;
  --accent-2: #69d4d7;
  --accent-soft: #effafa;
}

a { color: inherit; }
a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.page {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.brand-line {
  height: 6px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

header {
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.header-inner {
  min-height: 104px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.wordmark {
  display: inline-block;
  color: var(--text);
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.045em;
}
.header-note {
  color: var(--muted);
  font-size: 14px;
  text-align: right;
}

main { padding: 64px 0 76px; }
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
}
h1, h2, h3 { color: var(--text); }
h1 {
  margin: 0;
  max-width: 800px;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: -.035em;
}
.intro {
  max-width: 820px;
  margin: 25px 0 0;
  color: #3f4850;
  font-size: 21px;
  line-height: 1.55;
}

section {
  padding-top: 54px;
}
section + section {
  margin-top: 54px;
  border-top: 1px solid var(--line);
}
h2 {
  margin: 0 0 20px;
  font-size: 29px;
  line-height: 1.25;
  letter-spacing: -.02em;
}
h3 {
  margin: 30px 0 8px;
  font-size: 19px;
}
p { margin: 0 0 17px; }
p:last-child { margin-bottom: 0; }

.highlight {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}
.highlight strong { font-weight: 700; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 4px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--button-text);
  font-weight: 700;
  text-decoration: none;
}
.button:hover { filter: brightness(.94); }
.button.secondary {
  background: #fff;
  color: var(--text);
  border-color: #b9c1c7;
}
.button.secondary:hover { background: var(--soft); filter: none; }
.button::after { content: " ↗"; }

.brand-explanation {
  max-width: 830px;
  color: var(--muted);
  font-size: 16px;
}
.brand-explanation strong { color: var(--text); }

.legal-heading { margin-bottom: 8px; }
.legal-note { color: var(--muted); font-size: 15px; margin-bottom: 18px; }

details {
  border-top: 1px solid var(--line);
}
details:last-child { border-bottom: 1px solid var(--line); }
summary {
  cursor: pointer;
  list-style: none;
  padding: 19px 2px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  font-size: 25px;
  line-height: 1;
  color: var(--accent);
  font-weight: 400;
}
details[open] summary::after { content: "–"; }
.details-body {
  max-width: 820px;
  padding: 2px 2px 28px;
  color: #404a52;
  font-size: 15.5px;
}
.details-body a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.details-body h3:first-child { margin-top: 0; }

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--muted);
  font-size: 14px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.small { font-size: 14px; color: var(--muted); }

@media (max-width: 700px) {
  body { font-size: 16px; }
  .page { width: min(calc(100% - 28px), var(--max)); }
  .header-inner { min-height: 86px; }
  .wordmark { font-size: 30px; }
  .header-note { display: none; }
  main { padding: 46px 0 58px; }
  .intro { font-size: 18px; }
  section { padding-top: 42px; }
  section + section { margin-top: 42px; }
  h2 { font-size: 25px; }
  .actions { flex-direction: column; align-items: stretch; }
  .button { width: 100%; }
}