:root {
  --color-primary: #1a5f3f;
  --color-primary-dark: #123f2a;
  --color-text: #1a1a1a;
  --color-muted: #5a5a5a;
  --color-border: #d0d0d0;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7f6;
  --color-error: #b3261e;
  --color-success-bg: #e8f5ee;
  --color-success-border: #1a5f3f;
  --focus-ring: 3px solid #1a5f3f;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-text: #f0f0f0;
    --color-muted: #b5b5b5;
    --color-border: #454545;
    --color-bg: #1c1c1c;
    --color-bg-alt: #262626;
    --color-success-bg: #16301f;
    --color-success-border: #3fae74;
    --color-primary: #3fae74;
    --color-primary-dark: #2c7d52;
  }
}
:root[data-theme="dark"] {
  --color-text: #f0f0f0;
  --color-muted: #b5b5b5;
  --color-border: #454545;
  --color-bg: #1c1c1c;
  --color-bg-alt: #262626;
  --color-success-bg: #16301f;
  --color-success-border: #3fae74;
  --color-primary: #3fae74;
  --color-primary-dark: #2c7d52;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 16px 120px;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

p.lead {
  color: var(--color-muted);
  margin-top: 0;
}

.legal-note {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 28px;
}

fieldset {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
  margin: 0 0 24px;
}

legend {
  font-weight: 600;
  padding: 0 6px;
}

label {
  display: block;
  font-weight: 500;
  margin: 16px 0 6px;
}

label .optional {
  font-weight: 400;
  color: var(--color-muted);
  font-size: 0.85em;
}

input, textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

input:focus, textarea:focus, button:focus-visible, .revoke-button:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}

textarea { resize: vertical; min-height: 72px; }

input[readonly] { background: var(--color-bg-alt); color: var(--color-muted); }

.field-error {
  color: var(--color-error);
  font-size: 0.85rem;
  margin-top: 4px;
  display: none;
}

input:invalid:not(:placeholder-shown) ~ .field-error {
  display: block;
}

.submit-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 8px;
}

button.submit {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button.submit:hover { background: var(--color-primary-dark); }

.confirmation {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
  border-radius: 10px;
  padding: 20px;
  margin-top: 8px;
}

.confirmation h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

.confirmation dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 16px;
  margin: 16px 0;
}

.confirmation dt { color: var(--color-muted); }
.confirmation dd { margin: 0; }

.confirmation-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.confirmation-actions a, .confirmation-actions button {
  display: inline-block;
  text-decoration: none;
  font-size: 0.9rem;
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
  cursor: pointer;
  font-family: inherit;
}

.error-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-error);
  border-radius: 10px;
  padding: 20px;
  margin-top: 8px;
}

.error-box h2 { margin-top: 0; font-size: 1.15rem; color: var(--color-error); }
.error-box ul { margin: 12px 0; padding-left: 20px; }

/* Permanent, leicht zugänglicher Widerrufsbutton gemäß § 312k Abs. 1 BGB */
.revoke-button {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 14px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  cursor: pointer;
}

.revoke-button:hover { background: var(--color-primary-dark); }

@media (max-width: 480px) {
  .revoke-button {
    right: 12px;
    bottom: 12px;
    padding: 12px 18px;
    font-size: 0.9rem;
  }
}