:root {
  --ert-navy: #0f2744;
  --ert-navy-soft: #1a3a5c;
  --ert-blue: #2f6fed;
  --ert-blue-soft: #e8f0ff;
  --ert-orange: #f07a1a;
  --ert-ok: #1f8a4c;
  --ert-ok-bg: #edf8f1;
  --ert-bad: #b42318;
  --ert-bad-bg: #fef3f2;
  --ert-warn: #9a6700;
  --ert-warn-bg: #fffaeb;
  --ert-ink: #152033;
  --ert-muted: #5b6577;
  --ert-line: #e4e8ef;
  --ert-bg: #f5f4f1;
  --ert-surface: #ffffff;
  --ert-radius: 16px;
  --ert-radius-sm: 10px;
  --ert-shadow: 0 1px 2px rgba(15, 39, 68, 0.04), 0 8px 24px rgba(15, 39, 68, 0.05);
  --ert-max: 1360px;
  --ert-read: 50rem;
  --ert-header-h: 76px;
  --ert-font: Inter, system-ui, "Segoe UI", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: auto; }

body {
  margin: 0;
  font-family: var(--ert-font);
  color: var(--ert-ink);
  background: var(--ert-bg);
  line-height: 1.55;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ert-blue); }

img { max-width: 100%; height: auto; }

/* ——— Layout ——— */
.ert-shell {
  width: min(100% - 2.5rem, var(--ert-max));
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
}

.ert-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.ert-page__main {
  flex: 1;
}

.ert-section {
  padding: 4.5rem 0;
}

.ert-section--tight {
  padding: 3rem 0;
}

@media (max-width: 720px) {
  .ert-shell { width: min(100% - 2.5rem, var(--ert-max)); }
  .ert-section { padding: 3rem 0; }
  body { font-size: 16px; }
}

/* ——— Header ——— */
.ert-site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--ert-surface);
  border-bottom: 1px solid var(--ert-line);
}

.ert-site-header__inner {
  width: min(100% - 2.5rem, var(--ert-max));
  margin: 0 auto;
  min-height: var(--ert-header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.ert-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.ert-logo__img {
  display: block;
  width: clamp(12.5rem, 26vw, 17.5rem);
  height: auto;
}

.ert-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem 1.35rem;
}

.ert-nav__link {
  color: var(--ert-ink);
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 500;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}

.ert-nav__link:hover {
  color: var(--ert-navy);
  border-bottom-color: var(--ert-blue);
}

.ert-nav__link.is-active,
.ert-nav__link[aria-current="page"] {
  color: var(--ert-navy);
  border-bottom-color: var(--ert-navy);
  font-weight: 600;
}

.ert-nav__link--mobile { display: none; }

.ert-nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--ert-line);
  border-radius: 8px;
  background: var(--ert-surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.ert-nav-toggle__bars,
.ert-nav-toggle__bars::before,
.ert-nav-toggle__bars::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--ert-navy);
  position: relative;
  border-radius: 1px;
}

.ert-nav-toggle__bars::before,
.ert-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.ert-nav-toggle__bars::before { top: -6px; }
.ert-nav-toggle__bars::after { top: 6px; }

@media (max-width: 900px) {
  .ert-nav-toggle { display: inline-flex; }
  .ert-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--ert-surface);
    border-bottom: 1px solid var(--ert-line);
    padding: 0.75rem 1.25rem 1.25rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    z-index: 60;
  }
  .ert-nav.open { display: flex; }
  .ert-nav__link {
    padding: 0.85rem 0.25rem;
    border-bottom: 1px solid var(--ert-line);
  }
  .ert-nav__link--mobile { display: block; }
  .ert-logo__img { width: 12.5rem; }
}

/* ——— Footer ——— */
.ert-site-footer {
  margin-top: auto;
  border-top: 1px solid var(--ert-line);
  background: var(--ert-surface);
  padding: 2rem 0;
}

.ert-site-footer__inner {
  width: min(100% - 2.5rem, var(--ert-max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.ert-site-footer__logo img {
  display: block;
  width: 11rem;
  height: auto;
}

.ert-site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.15rem;
}

.ert-site-footer__nav a {
  color: var(--ert-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.ert-site-footer__nav a:hover {
  color: var(--ert-ink);
}

.ert-site-footer__disclaimer {
  flex: 1 1 100%;
  margin: 0.35rem 0 0;
  max-width: 42rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--ert-muted);
}

/* ——— Home hero ——— */
.ert-hero {
  padding: 3.5rem 0 1rem;
}

.ert-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.5rem 3rem;
  align-items: start;
}

.ert-label {
  display: inline-block;
  margin: 0 0 0.85rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ert-navy-soft);
}

.ert-hero h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(2.1rem, 4vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--ert-navy);
  font-weight: 700;
}

.ert-hero__lead {
  margin: 0 0 1.35rem;
  color: var(--ert-muted);
  font-size: 1.08rem;
  max-width: 36rem;
}

.ert-trust-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--ert-muted);
  font-size: 0.95rem;
}

.ert-trust-inline li::before {
  content: "✓ ";
  color: var(--ert-ok);
  font-weight: 700;
}

.ert-hero__tool {
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  box-shadow: var(--ert-shadow);
  padding: 1.35rem;
}

@media (max-width: 900px) {
  .ert-hero { padding: 2rem 0 0.5rem; }
  .ert-hero__grid { grid-template-columns: 1fr; gap: 1.75rem; }
}

/* ——— Upload ——— */
.ert-upload {
  display: grid;
  gap: 1rem;
}

.ert-upload__drop {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 0.4rem;
  text-align: center;
  padding: 2rem 1.25rem;
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  background: #fbfbfc;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.ert-upload__drop:hover,
.ert-upload__drop.is-dragover {
  border-color: var(--ert-blue);
  background: var(--ert-blue-soft);
  box-shadow: inset 0 0 0 1px rgba(47, 111, 237, 0.15);
}

.ert-upload__icon {
  color: var(--ert-navy-soft);
  margin-bottom: 0.35rem;
}

.ert-upload__title {
  font-size: 1.08rem;
  font-weight: 650;
  color: var(--ert-navy);
}

.ert-upload__formats,
.ert-upload__hint {
  color: var(--ert-muted);
  font-size: 0.92rem;
}

.ert-upload__file {
  font-size: 0.9rem;
  color: var(--ert-navy);
  font-weight: 550;
}

.ert-upload__browse {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.65rem;
  min-height: 2.5rem;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  color: var(--ert-navy);
  font-size: 0.92rem;
  font-weight: 600;
}

.ert-upload__input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.ert-upload__privacy {
  margin: 0;
  color: var(--ert-muted);
  font-size: 0.88rem;
  text-align: center;
}

.ert-upload__submit {
  appearance: none;
  border: 0;
  border-radius: 12px;
  min-height: 50px;
  padding: 0.85rem 1.25rem;
  background: var(--ert-navy);
  color: #fff;
  font: inherit;
  font-weight: 650;
  font-size: 1.02rem;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.05s ease;
}

.ert-upload__submit:hover:not(:disabled) {
  background: var(--ert-navy-soft);
}

.ert-upload__submit:disabled {
  opacity: 0.72;
  cursor: wait;
}

.ert-upload__submit-loading {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
}

.ert-upload.is-loading .ert-upload__submit-label {
  display: none;
}

.ert-upload.is-loading .ert-upload__submit-loading {
  display: inline-flex;
}

.ert-spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: ert-spin 0.7s linear infinite;
}

@keyframes ert-spin {
  to { transform: rotate(360deg); }
}

.ert-upload--compact .ert-upload__drop {
  padding: 1.25rem 1rem;
}

.ert-upload--compact .ert-upload__icon svg {
  width: 28px;
  height: 34px;
}

/* ——— Trust strip ——— */
.ert-trust {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem 2rem;
  padding: 2.25rem 0 0;
  border-top: 0;
}

.ert-trust__item .ert-trust__title,
.ert-trust__item h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 650;
  color: var(--ert-navy);
}

.ert-trust__item p {
  margin: 0;
  color: var(--ert-muted);
  font-size: 0.92rem;
}

@media (max-width: 800px) {
  .ert-trust { grid-template-columns: 1fr; gap: 1.25rem; }
}

/* ——— Home rules teaser ——— */
.ert-rules-teaser {
  background: var(--ert-surface);
  border-top: 1px solid var(--ert-line);
  border-bottom: 1px solid var(--ert-line);
}

.ert-rules-teaser__inner {
  width: min(100% - 2.5rem, var(--ert-max));
  margin: 0 auto;
  padding: 4.5rem 0;
  max-width: var(--ert-read);
}

.ert-rules-teaser h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.55rem, 2.5vw, 2rem);
  color: var(--ert-navy);
  letter-spacing: -0.02em;
}

.ert-rules-teaser__lead {
  margin: 0 0 1.35rem;
  color: var(--ert-muted);
}

.ert-search {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 0 0 1.5rem;
}

.ert-search label {
  width: 100%;
  font-size: 0.88rem;
  color: var(--ert-muted);
}

.ert-search input[type="search"] {
  flex: 1 1 14rem;
  min-height: 48px;
  border: 1px solid var(--ert-line);
  border-radius: 12px;
  padding: 0.7rem 0.95rem;
  font: inherit;
  background: #fff;
}

.ert-search button {
  min-height: 48px;
  border: 0;
  border-radius: 12px;
  padding: 0 1.15rem;
  background: var(--ert-navy);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.ert-rule-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.ert-rule-chips a {
  display: inline-flex;
  align-items: center;
  min-height: 2.15rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--ert-line);
  background: #fafbfc;
  color: var(--ert-navy);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.ert-rule-chips a:hover {
  border-color: var(--ert-blue);
  background: var(--ert-blue-soft);
}

.ert-text-link {
  font-weight: 600;
  text-decoration: none;
}

.ert-text-link:hover { text-decoration: underline; }

/* ——— Result / status ——— */
.ert-status {
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--ert-shadow);
  margin-bottom: 1.25rem;
}

.ert-status h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  letter-spacing: -0.02em;
  color: var(--ert-navy);
}

.ert-status p { margin: 0.55rem 0 0; color: var(--ert-muted); }

.ert-status__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 999px;
  margin: 0 0 0.65rem !important;
  font-weight: 700;
  font-size: 1rem;
}

.ert-status--ok { border-color: #cce9d8; }
.ert-status--ok .ert-status__badge { background: var(--ert-ok-bg); color: var(--ert-ok); }
.ert-status--bad { border-color: #f3d1cd; }
.ert-status--bad .ert-status__badge { background: var(--ert-bad-bg); color: var(--ert-bad); }
.ert-status--warn { border-color: #f0e0b2; }
.ert-status--warn .ert-status__badge { background: var(--ert-warn-bg); color: var(--ert-warn); }
.ert-status--neutral { border-color: var(--ert-line); }

.ert-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 0.85rem 1rem;
  margin: 0 0 1.75rem;
  padding: 1rem 1.15rem;
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius-sm);
}

.ert-meta dt {
  margin: 0;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ert-muted);
}

.ert-meta dd {
  margin: 0.15rem 0 0;
  font-weight: 600;
  color: var(--ert-navy);
}

.ert-hint {
  margin: 0 0 1.25rem;
  padding: 0.85rem 1rem;
  border-radius: var(--ert-radius-sm);
  background: #f7f8fa;
  border: 1px solid var(--ert-line);
  color: var(--ert-muted);
  font-size: 0.95rem;
}

/* ——— Issues ——— */
.ert-issues-block {
  margin: 0 0 2rem;
}

.ert-issues-block h2 {
  margin: 0 0 0.9rem;
  font-size: 1.25rem;
  color: var(--ert-navy);
}

.ert-issues {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.ert-issue {
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-left: 3px solid var(--ert-bad);
  border-radius: var(--ert-radius-sm);
  padding: 1.1rem 1.15rem;
}

.ert-issue--warn { border-left-color: var(--ert-warn); }

.ert-issue__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.45rem;
}

.ert-issue__code {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 750;
  letter-spacing: 0.02em;
  color: var(--ert-navy);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.ert-issue__count {
  margin: 0;
  color: var(--ert-muted);
  font-size: 0.88rem;
  white-space: nowrap;
}

.ert-issue__title {
  margin: 0 0 0.35rem;
  color: var(--ert-ink);
}

.ert-issue__summary {
  margin: 0 0 0.65rem;
  color: var(--ert-muted);
}

.ert-muted { color: var(--ert-muted); }

.ert-issue__locs {
  margin: 0 0 0.85rem;
  font-size: 0.92rem;
}

.ert-issue__locs ul {
  margin: 0.35rem 0 0;
  padding-left: 1.1rem;
  color: var(--ert-muted);
}

.ert-issue__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.85rem;
  align-items: flex-start;
}

.ert-issue__fix,
.ert-issue__tech {
  margin: 0;
}

.ert-issue__fix summary,
.ert-issue__tech summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  min-height: 2.1rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--ert-line);
  background: #fafbfc;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ert-navy);
}

.ert-issue__fix summary::-webkit-details-marker,
.ert-issue__tech summary::-webkit-details-marker { display: none; }

.ert-issue__fix[open] summary,
.ert-issue__tech[open] summary {
  background: var(--ert-blue-soft);
  border-color: #c9dbff;
}

.ert-issue__fix-body,
.ert-issue__tech pre {
  margin-top: 0.75rem;
}

.ert-issue__fix-body {
  padding: 0.85rem 0.95rem;
  background: #f8f9fb;
  border-radius: 10px;
  border: 1px solid var(--ert-line);
}

.ert-issue__fix-body p { margin: 0.35rem 0 0; color: var(--ert-muted); }

.ert-issue__more { margin: 0.65rem 0 0; }

.ert-issue__tech pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f6f7f9;
  border: 1px solid var(--ert-line);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  font-size: 0.82rem;
  color: var(--ert-muted);
}

/* ——— Viewer ——— */
.ert-viewer {
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  box-shadow: var(--ert-shadow);
  padding: 1.4rem 1.35rem 1.5rem;
}

.ert-viewer h2 {
  margin: 0 0 0.35rem;
  font-size: 1.3rem;
  color: var(--ert-navy);
}

.ert-viewer__note {
  margin: 0 0 1.15rem;
  color: var(--ert-muted);
  font-size: 0.9rem;
}

.ert-viewer__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.95rem 1.5rem;
  margin-bottom: 1.35rem;
}

.ert-viewer__label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ert-muted);
  margin-bottom: 0.15rem;
}

.ert-viewer__value {
  color: var(--ert-ink);
  font-weight: 550;
}

.ert-table-wrap { overflow-x: auto; }

.ert-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.ert-table th,
.ert-table td {
  padding: 0.7rem 0.55rem;
  border-bottom: 1px solid var(--ert-line);
  text-align: left;
  vertical-align: top;
}

.ert-table th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ert-muted);
  font-weight: 650;
}

.ert-table .num { text-align: right; font-variant-numeric: tabular-nums; }

.ert-unit {
  color: var(--ert-muted);
  font-size: 0.88em;
}

.ert-viewer__totals {
  margin: 1.15rem 0 0;
  margin-left: auto;
  width: min(100%, 16rem);
  display: grid;
  gap: 0.45rem;
}

.ert-viewer__totals > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.ert-viewer__totals dt {
  margin: 0;
  color: var(--ert-muted);
}

.ert-viewer__totals dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.ert-viewer__total-strong dt,
.ert-viewer__total-strong dd {
  color: var(--ert-navy);
  font-size: 1.05rem;
  font-weight: 750;
}

@media (max-width: 700px) {
  .ert-viewer__grid { grid-template-columns: 1fr; }
  .ert-table thead { display: none; }
  .ert-table tr {
    display: grid;
    gap: 0.35rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--ert-line);
  }
  .ert-table td {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    border: 0;
    padding: 0.15rem 0;
    text-align: right;
  }
  .ert-table td::before {
    content: attr(data-label);
    color: var(--ert-muted);
    font-size: 0.82rem;
    text-align: left;
  }
  .ert-table .num { text-align: right; }
}

/* ——— Fehler index / rule ——— */
.ert-page-head {
  margin: 1.25rem 0 1.75rem;
  max-width: var(--ert-read);
}

.ert-breadcrumb {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  color: var(--ert-muted);
}

.ert-breadcrumb a {
  color: var(--ert-muted);
  text-decoration: none;
}

.ert-breadcrumb a:hover { color: var(--ert-blue); }

.ert-page-head h1 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  letter-spacing: -0.02em;
  color: var(--ert-navy);
  line-height: 1.2;
}

.ert-page-head p,
.ert-rule-meta {
  margin: 0;
  color: var(--ert-muted);
}

.ert-rule-meta {
  margin-top: 0.55rem;
  font-size: 0.9rem;
}

.ert-rule-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 20rem);
  gap: 2rem;
  align-items: start;
}

.ert-rule {
  max-width: var(--ert-read);
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  padding: 1.5rem 1.4rem;
  box-shadow: var(--ert-shadow);
}

.ert-rule h2 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.12rem;
  color: var(--ert-navy);
}

.ert-rule h2:first-of-type { margin-top: 0.75rem; }

.ert-rule p { color: var(--ert-muted); }

.ert-rule__tech {
  white-space: pre-wrap;
  background: #f6f7f9;
  border: 1px solid var(--ert-line);
  padding: 0.85rem;
  border-radius: 10px;
  font-size: 0.88rem;
  color: var(--ert-muted);
}

.ert-facts {
  display: grid;
  gap: 0.55rem;
}

.ert-facts > div {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.5rem;
}

.ert-facts dt {
  margin: 0;
  color: var(--ert-muted);
  font-size: 0.88rem;
}

.ert-facts dd { margin: 0; }

.ert-aside {
  position: sticky;
  top: calc(var(--ert-header-h) + 1rem);
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  padding: 1.15rem;
  box-shadow: var(--ert-shadow);
}

.ert-aside h2 {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  color: var(--ert-navy);
}

/* Discreet sponsored sidebar ad (Fehler detail) */
.ert-ad {
  margin: 1.15rem 0 0;
  padding: 0.75rem 0 0;
  border-top: 1px solid var(--ert-line);
  max-width: 100%;
}

.ert-ad__label {
  margin: 0 0 0.45rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ert-muted);
  font-weight: 500;
}

.ert-ad a {
  display: block;
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius-sm);
  overflow: hidden;
  line-height: 0;
  background: #fff;
  transition: border-color 0.15s ease;
}

.ert-ad a:hover {
  border-color: #c9dbff;
}

.ert-ad img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.ert-rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.ert-rule-list a {
  color: var(--ert-ink);
  text-decoration: none;
  display: block;
  padding: 0.85rem 0.95rem;
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius-sm);
}

.ert-rule-list a:hover {
  border-color: #c9dbff;
  background: #fbfcff;
}

.ert-back {
  margin: 1.5rem 0 0;
}

.ert-back a {
  color: var(--ert-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.ert-back a:hover { color: var(--ert-blue); }

@media (max-width: 960px) {
  .ert-rule-layout { grid-template-columns: 1fr; }
  .ert-aside { position: static; }
}

/* ——— Legal ——— */
.ert-legal-page {
  max-width: var(--ert-read);
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  padding: 1.6rem 1.5rem;
  box-shadow: var(--ert-shadow);
}

.ert-legal-page h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--ert-navy);
}

.ert-legal-page__content h2 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.1rem;
  color: var(--ert-navy);
}

.ert-legal-page__content p,
.ert-legal-page__content ul,
.ert-legal-page__content ol {
  margin: 0 0 0.85rem;
  color: var(--ert-muted);
}

.ert-legal-page__content ul,
.ert-legal-page__content ol { padding-left: 1.2rem; }

.ert-legal-page__content a {
  color: var(--ert-navy);
}

.ert-legal-page__content a:hover {
  color: var(--ert-ink);
}

.ert-legal-page__content .ert-note {
  margin: 1.25rem 0 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--ert-line);
  background: color-mix(in srgb, var(--ert-surface) 88%, var(--ert-navy) 12%);
  font-size: 0.95rem;
}

/* Legacy aliases used in older markup */
.ert-card {
  background: var(--ert-surface);
  border: 1px solid var(--ert-line);
  border-radius: var(--ert-radius);
  padding: 1.25rem;
  box-shadow: var(--ert-shadow);
}

.ert-brand { display: none; }
.ert-footer { display: none; }

/* ——— Print actions ——— */
.ert-print-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 0.85rem;
  margin: 0 0 1.25rem;
}

.ert-print-actions__hint {
  flex: 1 1 100%;
  margin: 0;
  color: var(--ert-muted);
  font-size: 0.88rem;
}

.ert-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.45rem 1rem;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
}

.ert-btn--primary {
  background: var(--ert-navy);
  color: #fff;
}

.ert-btn--primary:hover { background: var(--ert-navy-soft); }

.ert-btn--ghost {
  background: #fff;
  border-color: var(--ert-line);
  color: var(--ert-navy);
}

.ert-btn--ghost:hover {
  border-color: var(--ert-blue);
  background: var(--ert-blue-soft);
}

.print-only { display: none !important; }

/* ——— Print / Prüfbericht ——— */
@media print {
  @page {
    size: A4;
    margin: 14mm 12mm;
  }

  html, body {
    background: #fff !important;
    color: #111 !important;
    font-size: 11pt;
    line-height: 1.4;
  }

  .no-print,
  .ert-site-header,
  .ert-site-footer,
  .ert-nav,
  .ert-nav-toggle,
  .ert-upload,
  .ert-print-actions,
  .ert-back,
  .ert-search,
  .ert-aside,
  .ert-ad,
  .ert-rules-teaser,
  .ert-hint,
  .ert-issue__actions,
  .ert-issue__more,
  .ert-status__badge {
    display: none !important;
  }

  .print-only { display: block !important; }

  .ert-page,
  .ert-page__main,
  .ert-shell,
  .ert-result-shell {
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .ert-print-header {
    margin: 0 0 1.2rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #ccc;
  }

  .ert-print-header__logo {
    display: block;
    width: 42mm;
    height: auto;
    margin: 0 0 0.6rem;
  }

  .ert-print-header__title {
    margin: 0 0 0.75rem;
    font-size: 16pt;
    color: #111 !important;
  }

  .ert-print-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.25rem 1rem;
    margin: 0;
  }

  .ert-print-meta > div {
    display: grid;
    grid-template-columns: 38% 62%;
    gap: 0.25rem;
  }

  .ert-print-meta dt {
    margin: 0;
    color: #444 !important;
    font-weight: 600;
  }

  .ert-print-meta dd {
    margin: 0;
    color: #111 !important;
  }

  .ert-status,
  .ert-meta,
  .ert-issue,
  .ert-viewer,
  .ert-card {
    background: #fff !important;
    box-shadow: none !important;
    border: 1px solid #ccc !important;
    border-radius: 0 !important;
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .ert-status--ok { border-left: 3px solid #1f8a4c !important; }
  .ert-status--bad { border-left: 3px solid #b42318 !important; }
  .ert-status--warn { border-left: 3px solid #9a6700 !important; }

  .ert-issue {
    border-left: 3px solid #b42318 !important;
    margin-bottom: 0.65rem;
  }

  .ert-issue--warn { border-left-color: #9a6700 !important; }

  .ert-issue__tech-print {
    margin-top: 0.45rem;
  }

  .ert-issue__tech-print h4 {
    margin: 0 0 0.25rem;
    font-size: 10pt;
  }

  .ert-issue__tech-print pre,
  .ert-issue__tech pre {
    white-space: pre-wrap;
    word-break: break-word;
    background: #f7f7f7 !important;
    border: 1px solid #ddd !important;
    padding: 0.4rem 0.5rem;
    font-size: 8.5pt;
    color: #222 !important;
  }

  .ert-meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .ert-viewer {
    break-before: page;
    page-break-before: always;
  }

  .ert-table {
    width: 100%;
    border-collapse: collapse;
  }

  .ert-table th,
  .ert-table td {
    border-bottom: 1px solid #ccc !important;
    color: #111 !important;
  }

  .ert-table thead { display: table-header-group; }
  .ert-table tr { break-inside: avoid; page-break-inside: avoid; }

  a { color: #111 !important; text-decoration: none !important; }

  .ert-print-privacy {
    margin-top: 1.25rem;
    padding-top: 0.6rem;
    border-top: 1px solid #ccc;
    font-size: 9pt;
    color: #444 !important;
  }
}