:root {
  --blau: #1f4e9c;
  --blau-hell: #e8eef8;
  --text: #1c1c1c;
  --grau: #5b5b5b;
  --linie: #c8ccd4;
  --rot: #b3261e;
  --rot-hell: #fbeceb;
  --hinter: #ffffff;
  --flaeche: #f6f7f9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--hinter);
  color: var(--text);
  font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.header, main, .footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }

.header {
  display: flex; gap: 16px; justify-content: space-between; align-items: center;
  padding-top: 20px; padding-bottom: 16px; border-bottom: 3px solid var(--blau);
}
.header .association { font-size: 1.15rem; font-weight: 600; margin: 0; color: var(--blau); }
.header .address { margin: 4px 0 0; color: var(--grau); font-size: .9rem; }
.header img { width: 190px; height: auto; flex: none; }

h1 { font-size: 1.6rem; margin: 28px 0 12px; }
h2 { font-size: 1.15rem; margin: 24px 0 8px; }

a { color: var(--blau); }

fieldset {
  border: 1px solid var(--linie); border-radius: 8px;
  margin: 24px 0; padding: 8px 20px 16px;
}
legend { font-weight: 600; font-size: 1.05rem; padding: 0 6px; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.row.postal-city { grid-template-columns: 9em 1fr; }

.field { margin: 14px 0 0; }
.field label { display: block; font-weight: 500; margin-bottom: 4px; }
.optional { font-weight: normal; color: var(--grau); font-size: .9em; }
.field input {
  width: 100%; font: inherit; padding: 9px 11px;
  border: 1px solid #8a8f99; border-radius: 6px; background: #fff; color: var(--text);
}
.field input:focus, .checkbox input:focus { outline: 3px solid #9bb6e6; outline-offset: 1px; }
#fee { max-width: 9em; }
#iban { font-family: ui-monospace, Menlo, Consolas, monospace; letter-spacing: .03em; }

.help { margin: 4px 0 0; color: var(--grau); font-size: .9rem; }
.error { margin: 4px 0 0; color: var(--rot); font-size: .92rem; font-weight: 500; }
.invalid input { border-color: var(--rot); border-width: 2px; }

.checkbox { display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; margin: 16px 0 0; align-items: start; }
.checkbox input { width: 22px; height: 22px; margin: 2px 0 0; }
.checkbox .error { grid-column: 2; }

.legal {
  background: var(--flaeche); border-radius: 6px; padding: 10px 14px; margin-top: 16px;
  font-size: .92rem;
}
.legal p { margin: 6px 0; }
.small { font-size: .92rem; color: var(--grau); }

details { margin-top: 10px; border: 1px solid var(--linie); border-radius: 6px; padding: 8px 14px; }
details summary { cursor: pointer; font-weight: 500; color: var(--blau); }
details[open] { max-height: 60vh; overflow: auto; }

.bylaws { font-size: .95rem; }
.bylaws h3 { font-size: 1rem; margin: 18px 0 4px; }
.bylaws p, .bylaws ul { margin: 4px 0; }
.bylaws-version { font-style: italic; color: var(--grau); }

.notice {
  background: var(--rot-hell); border-left: 4px solid var(--rot);
  padding: 10px 14px; margin: 16px 0; border-radius: 4px;
}

button, .button {
  display: inline-block; font: inherit; font-weight: 600; cursor: pointer;
  background: var(--blau); color: #fff; border: 0; border-radius: 6px;
  padding: 12px 22px; margin: 8px 0 32px; text-decoration: none;
}
button:hover, .button:hover { background: #173d7b; }

.trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

.footer {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  border-top: 1px solid var(--linie); padding-top: 14px; padding-bottom: 28px;
  font-size: .9rem;
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .header { flex-direction: column-reverse; align-items: flex-start; }
  .header img { width: 150px; }
  .row, .row.postal-city { grid-template-columns: 1fr; }
  fieldset { padding: 6px 14px 14px; }
}

.association-name { font-weight: 600; text-align: center; margin: 4px 0 12px; }