/* viewer.css — Design des öffentlichen Viewers nach Claude-Design „Viewer.dc.html".
   Weiße Fläche, Indigo-Akzent, Plex Sans/Mono, 680px-Spalte, runde Karten.
   Nur für viewer.html; App und Anbindung nutzen weiterhin minimal.css.
   Markup-/JS-Selektoren (IDs, .zahl, .summenzeile, .ist-darueber …) unverändert. */

@font-face {
  font-family: "Plex Sans";
  src: url("fonts/PlexSans-Regular.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Plex Sans";
  src: url("fonts/PlexSans-Medium.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("fonts/PlexMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

:root {
  --tinte: #15171C;
  --tinte-68: rgba(21, 23, 28, 0.68);
  --tinte-60: rgba(21, 23, 28, 0.6);
  --tinte-55: rgba(21, 23, 28, 0.55);
  --tinte-50: rgba(21, 23, 28, 0.5);
  --tinte-45: rgba(21, 23, 28, 0.45);
  --haar: #E7E7EC;
  --haar-zart: #F1F1F5;
  --haar-strich: #DBDBE3;
  --indigo: #4438CA;
  --indigo-dunkel: #332B96;
  --indigo-hauch: #EFEDFC;
  --flaeche: #F7F7FA;
  --gruen: #17805A;
  --gruen-hauch: #E9F6EF;
  --rot: #C23434;
  --rot-hauch: #FDF4F3;
  --sans: "Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --mono: "Plex Mono", ui-monospace, monospace;
}

[hidden] { display: none !important; }

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: #fff;
  color: var(--tinte);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "tnum" 1;
}

.wrap { max-width: 680px; margin: 0 auto; padding: 0 32px; }

h1, h2, h3 { font-weight: 500; line-height: 1.15; margin: 0 0 12px; }

p { margin: 0 0 8px; }

a { color: var(--indigo); text-decoration: none; }
a:hover { color: var(--indigo-dunkel); }

::selection { background: var(--indigo); color: #fff; }

:focus-visible { outline: 2px solid var(--indigo); outline-offset: 2px; }

/* ---------- Kopf ---------- */

.kopf {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #fff;
  border-bottom: 1px solid var(--haar);
}
.kopf-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.wortmarke {
  color: var(--tinte);
  font-size: 1.05rem;
  line-height: 0.9;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.wortmarke:hover { color: var(--tinte); }
.marke-zeile { display: block; font-weight: 400; }
.marke-akzent { font-weight: 500; color: var(--indigo); }
.marke-grund { font-weight: 400; color: var(--tinte); }
.nav { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.nav a {
  color: var(--tinte-68);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
}
.nav a:hover { color: var(--indigo); }
.nav .cta {
  background: var(--indigo);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
}
.nav .cta:hover { background: var(--indigo-dunkel); color: #fff; }
.nav-schalter {
  position: absolute;
  visibility: hidden;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.nav-burger { display: none; }
.nav-schalter:focus-visible + .nav-burger {
  outline: 2px solid var(--indigo);
  outline-offset: 2px;
}

/* ---------- Fuß ---------- */

.fuss { border-top: 1px solid var(--haar); background: var(--flaeche); margin-top: 0; }
.fuss .wrap { max-width: 1200px; }
.fuss-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 32px;
  padding-bottom: 32px;
}
.fuss-grid > div:first-child { display: flex; gap: 20px; flex-wrap: wrap; }
.fuss a { color: var(--tinte-68); font-size: 0.88rem; }
.fuss a:hover { color: var(--indigo); }
.herkunft { font-family: var(--mono); font-size: 0.82rem; color: var(--tinte-45); }

/* ---------- Kicker ---------- */

.aktenzeichen, .feldnummer {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--indigo);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
}

/* ---------- Einstieg ---------- */

.viewer-haupt { padding: clamp(48px, 7vw, 80px) 0 88px; }

.viewer-einstieg { margin-bottom: 48px; }
.viewer-einstieg .aktenzeichen { margin-bottom: 14px; }
.viewer-einstieg h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.6rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 16px;
}
.viewer-einstieg > p { color: var(--tinte-68); font-size: 1.05rem; margin: 0; }
.viewer-einstieg strong { color: var(--tinte); font-weight: 500; }

/* ---------- Upload ---------- */

.upload-akte { margin: 0; }
.upload-zone {
  min-height: 150px;
  border: 1px dashed var(--haar-strich);
  border-radius: 14px;
  background: #fff;
  display: grid;
  place-items: center;
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  position: relative;
  transition: border-color 0.12s, background 0.12s;
}
.upload-zone:hover, .upload-zone:focus-visible, .upload-zone.ist-darueber {
  border-color: var(--indigo);
  background: var(--indigo-hauch);
  outline: none;
}
.upload-symbol {
  width: 44px;
  height: 52px;
  border: 1px solid var(--haar-strich);
  border-radius: 6px;
  background: #fff;
  display: grid;
  place-items: center;
  margin: 0 auto 16px;
  font-family: var(--mono);
  font-size: 1.2rem;
  color: var(--indigo);
}
.upload-zone h2 { font-size: 1.05rem; margin: 0 0 6px; }
.upload-zone #upload-hinweis { color: var(--tinte-55); font-size: 0.9rem; margin: 0 0 16px; }
.upload-knopf { margin-top: 0; }
.datei-input, .visuell-versteckt {
  position: absolute !important;
  width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
#viewer-dateiname { margin: 12px 0 0; font-size: 0.85rem; color: var(--tinte-55); }
#viewer-dateiname:empty { display: none; }
.datenschutz-kurz {
  text-align: center;
  color: var(--tinte-45);
  font-size: 0.85rem;
  margin: 16px 0 0;
}

.viewer-laden {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 32px 0 0;
  color: var(--tinte-60);
  font-size: 0.95rem;
}
.viewer-laden::before {
  content: "";
  flex: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--haar-strich);
  border-top-color: var(--indigo);
  border-radius: 50%;
  animation: viewer-dreh 0.8s linear infinite;
}
@keyframes viewer-dreh { to { transform: rotate(360deg); } }

.viewer-fehler {
  margin: 24px 0 0;
  padding: 12px 16px;
  border: 1px solid var(--rot);
  border-radius: 10px;
  background: var(--rot-hauch);
  color: var(--rot);
  font-size: 0.9rem;
  white-space: pre-line;
}
.viewer-fehler:empty { display: none; }

/* ---------- Ergebnis: Prüfkopf ---------- */

.viewer-ergebnis { margin-top: 48px; }

.pruefkopf {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--haar);
  padding-bottom: 16px;
  margin-bottom: 24px;
}
.pruefstatus { display: flex; align-items: center; gap: 12px; }
.pruef-symbol {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1rem;
  font-weight: 500;
}
#pruef-label { font-weight: 500; display: block; }
#pruef-zusatz { display: block; font-size: 0.85rem; color: var(--tinte-55); }
.pruefkopf[data-tone="valid"] .pruef-symbol { background: var(--gruen-hauch); color: var(--gruen); }
.pruefkopf[data-tone="valid"] #pruef-label { color: var(--gruen); }
.pruefkopf[data-tone="invalid"] .pruef-symbol { background: var(--rot-hauch); color: var(--rot); }
.pruefkopf[data-tone="invalid"] #pruef-label { color: var(--rot); }
.pruefkopf[data-tone="limited"] .pruef-symbol { background: var(--haar-zart); color: var(--tinte-60); }
.pruefkopf[data-tone="limited"] #pruef-label { color: var(--tinte-60); }
.dateityp {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--tinte-50);
  background: var(--flaeche);
  border: 1px solid var(--haar);
  padding: 5px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.dateityp:empty { display: none; }

/* ---------- Ergebnis: Rechnung ---------- */

.rechnung-papier {
  border: 1px solid var(--haar);
  border-radius: 14px;
  background: #fff;
  padding: 26px 28px;
  margin: 0 0 24px;
}

.rechnung-kopf {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.rechnung-titel { text-align: right; }
.rechnung-titel h2 { font-size: 1.15rem; margin: 4px 0 0; }
.dokumentart {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--tinte-45);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.partei-label, .block-label {
  font-size: 0.72rem;
  color: var(--tinte-45);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
}
.partei-name { font-weight: 500; margin-top: 4px; }
.partei-adresse { color: var(--tinte-60); font-size: 0.92rem; }
.partei-adresse.mehrzeilig, .mehrzeilig { white-space: pre-line; }
.partei-steuer { font-family: var(--mono); font-size: 0.82rem; color: var(--tinte-50); margin-top: 2px; }

.rechnung-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  border-top: 1px solid var(--haar);
  border-bottom: 1px solid var(--haar);
  padding: 14px 0;
  margin: 0 0 16px;
}
.rechnung-meta dt {
  font-size: 0.72rem;
  color: var(--tinte-45);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.rechnung-meta dd { margin: 3px 0 0; font-size: 0.92rem; }
#invoice-number, #buyer-reference { font-family: var(--mono); }
.rechnung-zusatzangabe { grid-column: 1 / -1; }
.vorbeleg-liste { margin: 0; padding-left: 18px; }
.vorbeleg-liste li + li { margin-top: 2px; }

.rechnung-adressen {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

/* ---------- Ergebnis: Positionen ---------- */

.tabellen-scroll { overflow-x: auto; margin-bottom: 20px; }

table { border-collapse: collapse; width: 100%; }
.rechnung-tabelle { min-width: 560px; }
.rechnung-tabelle th {
  text-align: left;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--tinte-45);
  font-weight: 500;
  padding: 0 12px 8px 0;
  border-bottom: 1px solid var(--haar);
}
.rechnung-tabelle th:last-child { padding-right: 0; }
.rechnung-tabelle th.zahl { text-align: right; }
.rechnung-tabelle td {
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--haar-zart);
  font-size: 0.92rem;
  vertical-align: top;
}
.rechnung-tabelle td:last-child { padding-right: 0; }
.rechnung-tabelle td.zahl, .zahl {
  font-family: var(--mono);
  font-size: 0.9rem;
  text-align: right;
  white-space: nowrap;
}
.positions-text strong { font-weight: 500; }
.positions-text small { display: block; color: var(--tinte-55); font-size: 0.82rem; }

/* ---------- Ergebnis: Abschluss ---------- */

.rechnung-abschluss {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  border-top: 1px solid var(--haar);
  padding-top: 16px;
}
.rechnung-abschluss > div:first-child {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}
.zahlungsblock dl {
  margin: 6px 0 0;
  display: grid;
  grid-template-columns: minmax(110px, max-content) 1fr;
  gap: 2px 12px;
  font-size: 0.88rem;
}
.zahlungsblock dt { color: var(--tinte-55); }
.zahlungsblock dd { margin: 0; color: var(--tinte-68); overflow-wrap: anywhere; }
#iban, #bic, #debited-iban, #mandate-reference, #creditor-id {
  font-family: var(--mono);
  font-size: 0.85rem;
}
.steuerblock { font-size: 0.9rem; }
#steueraufstellung { margin-top: 6px; }
.steuerzeile {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 3px 0;
  color: var(--tinte-68);
  font-size: 0.9rem;
}
.steuerzeile span:last-child { font-family: var(--mono); white-space: nowrap; }
.steuerblock small { display: block; color: var(--tinte-55); font-size: 0.82rem; }

#summen { width: 100%; max-width: 280px; margin-left: auto; }
.summenzeile {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 3px 0;
  font-size: 0.9rem;
  color: var(--tinte-68);
}
.summenzeile span:last-child, .summenzeile strong:last-child {
  font-family: var(--mono);
  white-space: nowrap;
}
.summenzeile.brutto {
  border-top: 1px solid var(--haar);
  padding-top: 8px;
  margin-top: 4px;
  font-size: 1rem;
  color: var(--tinte);
}
.summenzeile.brutto strong { font-weight: 500; }

/* ---------- Ergebnis: Details & Hinweise ---------- */

.viewer-details {
  border: 1px solid var(--haar);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 0 0 24px;
}
.viewer-details summary {
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--tinte-68);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.viewer-details summary::-webkit-details-marker { display: none; }
.viewer-details summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--indigo);
  flex: none;
  transition: transform 0.2s ease;
}
.viewer-details[open] summary::after { transform: rotate(45deg); }
.validierungsliste {
  margin: 14px 0 0;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--tinte-60);
}
.validierungsliste li { margin-bottom: 6px; }
.validierungsliste strong { font-weight: 500; color: var(--tinte); }
.validierungsliste small { display: block; color: var(--tinte-45); }

.fidelity-hinweise {
  border: 1px solid var(--haar);
  border-radius: 14px;
  background: var(--flaeche);
  padding: 16px 20px;
  margin: 0 0 24px;
  font-size: 0.88rem;
  color: var(--tinte-60);
}
.fidelity-hinweise strong { color: var(--tinte); font-weight: 500; }
.fidelity-hinweise p { margin: 4px 0 6px; }
.fidelity-hinweise ul { margin: 0; padding-left: 18px; }

/* ---------- Ergebnis: CTA ---------- */

.viewer-cta {
  border-top: 1px solid var(--haar);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.viewer-cta > div:first-child { flex: 1 1 300px; min-width: 0; }
.viewer-cta .btn { flex: none; }
.viewer-cta h2 { font-size: 1.05rem; margin: 0 0 4px; }
.viewer-cta p { color: var(--tinte-60); font-size: 0.9rem; margin: 0; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  border: 1px solid var(--haar-strich);
  border-radius: 8px;
  background: none;
  color: var(--tinte);
  padding: 9px 16px;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.btn:hover { border-color: var(--tinte); color: var(--tinte); }
.btn-voll {
  background: var(--indigo);
  border-color: var(--indigo);
  color: #fff;
  padding: 12px 22px;
}
.btn-voll:hover { background: var(--indigo-dunkel); border-color: var(--indigo-dunkel); color: #fff; }
.btn:disabled { opacity: 0.45; cursor: default; }

/* ---------- Erklärung & FAQ ---------- */

.viewer-erklaerung { background: var(--flaeche); padding: 64px 0 88px; }
.viewer-faq { padding: 88px 0 96px; }

.sektions-kopf { margin: 0 0 14px; }
.sektions-kopf .feldnummer { margin-bottom: 12px; }
.sektions-kopf h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.sektions-kopf p { color: var(--tinte-68); font-size: 1.02rem; margin: 0; }
.viewer-faq .sektions-kopf { margin-bottom: 32px; }
.viewer-faq .sektions-kopf h2 { margin-bottom: 0; }

.faq { border-top: 1px solid var(--haar); }
.faq details { border-bottom: 1px solid var(--haar); }
.faq summary {
  cursor: pointer;
  padding: 18px 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-weight: 500;
  font-size: 0.98rem;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--indigo);
  flex: none;
  transition: transform 0.2s ease;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .antwort {
  padding: 0 4px 20px;
  color: var(--tinte-68);
  font-size: 0.94rem;
}

/* ---------- Responsiv ---------- */

@media (max-width: 760px) {
  .kopf-inner { padding-left: 20px; padding-right: 20px; }
  .nav-schalter { visibility: visible; }
  .nav-burger {
    display: flex;
    width: 44px;
    height: 44px;
    margin-left: auto;
    flex: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    touch-action: manipulation;
  }
  .nav-burger span {
    width: 22px;
    height: 2px;
    border-radius: 999px;
    background: var(--tinte);
    transform-origin: center;
    transition: transform 0.22s ease, opacity 0.18s ease;
  }
  .nav-schalter:checked + .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-schalter:checked + .nav-burger span:nth-child(2) { opacity: 0; }
  .nav-schalter:checked + .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-schalter ~ .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    max-height: 0;
    padding: 0 20px;
    overflow: hidden;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid transparent;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: max-height 0.28s ease, padding 0.28s ease, border-color 0.28s ease,
      opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0.28s;
  }
  .nav-schalter ~ .nav a {
    display: flex;
    width: 100%;
    min-height: 44px;
    align-items: center;
  }
  .nav-schalter ~ .nav .cta { justify-content: center; margin-top: 8px; }
  .nav-schalter:checked ~ .nav {
    max-height: calc(100vh - 73px);
    padding-top: 8px;
    padding-bottom: 16px;
    overflow-y: auto;
    border-bottom-color: var(--haar);
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
  }
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .kopf-inner { padding: 12px 20px; }
  .rechnung-papier { padding: 20px 16px; }
  .rechnung-titel { text-align: left; }
  .zahlungsblock dl { grid-template-columns: 1fr; gap: 0 12px; }
  .zahlungsblock dt { margin-top: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .viewer-laden::before { animation: none; }
  * { transition: none !important; }
}