:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --brand: #1d4ed8;
  --brand-contrast: #ffffff;
  --focus: #2563eb;
  --danger: #b91c1c;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
  --touch: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --surface: #1e293b;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --border: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--surface);
  color: var(--text);
  border: 2px solid var(--focus);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.site-header__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand img {
  height: 40px;
  width: auto;
  display: block;
}

.nav-main ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.nav-main a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  min-height: var(--touch);
  display: inline-flex;
  align-items: center;
}

.nav-main a:hover {
  color: var(--text);
  background: var(--bg);
}

.nav-main a[aria-current="page"] {
  color: var(--brand);
  font-weight: 600;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

h1 {
  font-size: clamp(1.5rem, 4vw, 1.85rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.5rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
}

.goal-grid {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 520px) {
  .goal-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.goal-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  padding: 1rem 1.1rem;
  min-height: 5.5rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.goal-card:hover {
  border-color: var(--brand);
}

.goal-card:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.goal-card__title {
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.goal-card__desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.4;
}

.social-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

@media (min-width: 480px) {
  .social-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.social-btn {
  padding: 0.85rem;
  min-height: var(--touch);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.social-btn:hover {
  border-color: var(--brand);
}

.social-btn:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.form-row {
  margin-bottom: 1rem;
}

.form-row label,
.form-row-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text);
}

.form-row input[type="text"],
.form-row input[type="url"] {
  width: 100%;
  max-width: 100%;
  padding: 0.65rem 0.75rem;
  min-height: var(--touch);
  border: 2px solid var(--border);
  border-radius: 8px;
  font: inherit;
  background: var(--surface);
  color: var(--text);
}

.form-row input:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
}

.hint {
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: 0.35rem;
}

details.advanced {
  margin: 1.25rem 0;
  padding: 0.75rem 1rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

details.advanced summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.35rem 0;
  min-height: var(--touch);
  display: flex;
  align-items: center;
}

details.advanced summary:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch);
  padding: 0.5rem 1.25rem;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  color: inherit;
}

.btn--primary {
  background: var(--brand);
  color: var(--brand-contrast);
}

.btn--primary:hover {
  filter: brightness(1.05);
}

.btn--primary:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.btn--secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.btn--secondary:hover {
  border-color: var(--muted);
}

.btn--secondary:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.output-url {
  word-break: break-all;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  font-family: ui-monospace, monospace;
  font-size: 0.9rem;
}

.utm-human {
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.utm-human li {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.utm-human li:last-child {
  border-bottom: none;
}

.utm-human strong {
  color: var(--muted);
  font-weight: 600;
  display: inline-block;
  min-width: 8rem;
}

.qr-block {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.qr-preview-wrap {
  display: inline-block;
  padding: 1rem;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

#qrCanvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.logo-upload {
  margin: 1rem 0;
}

.logo-upload label {
  font-weight: 600;
  display: block;
  margin-bottom: 0.5rem;
}

.logo-warn {
  font-size: 0.88rem;
  color: var(--danger);
  margin-top: 0.5rem;
}

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--brand);
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 2px solid var(--danger);
  background: rgba(185, 28, 28, 0.08);
  color: var(--text);
  margin-bottom: 1rem;
}

.hilfe-page main {
  max-width: 720px;
}

.hilfe-page h2 {
  margin-top: 2rem;
  font-size: 1.2rem;
}

.hilfe-page ul {
  padding-left: 1.25rem;
}

.hilfe-page li {
  margin: 0.35rem 0;
}