/*
 * OpenBuchhaltung – Projekt-Webseite
 * Layout: Kontenblatt. Ruhige Spalten auf hellem Papier, Linien statt Kästen,
 * Ziffern und Kontonummern in Monospace, Summen mit doppeltem Strich.
 * Farben aus der Anwendung (style.css): Navy der Kopfzeile, Stahlblau als Akzent.
 * Keine externen Ressourcen (Schriften des Systems), keine Inline-Styles (CSP).
 */

:root {
  --paper: #f4f6f8;
  --surface: #ffffff;
  --sunk: #eaeff3;
  --ink: #13283a;
  --muted: #536879;
  --line: #d6dfe6;
  --line-strong: #adbcc8;
  --rule: rgba(31, 95, 139, 0.075);
  --accent: #1f5f8b;
  --accent-strong: #164a6e;
  --accent-wash: #e3edf5;
  --red-ink: #b42318;
  --mark-red: #ff8a7d;
  --ok: #1e6b3a;
  --ok-wash: #e1f2e6;
  --band: #16344a;
  --band-ink: #eef4f8;
  --band-muted: #a9bfcf;
  --band-line: #2b4b63;
  --band-raised: #1d4059;
  --code-bg: #0f2231;
  --code-ink: #dae6ef;
  --code-muted: #8ea6b8;
  --shadow: 0 1px 2px rgba(19, 40, 58, 0.06), 0 12px 32px -12px rgba(19, 40, 58, 0.22);

  --font-display: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", "Segoe UI Mono", Menlo,
    Consolas, "Liberation Mono", monospace;

  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 32px);
  --radius: 10px;
  --header-h: 64px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0c1720;
    --surface: #122130;
    --sunk: #0f1c28;
    --ink: #e3ebf1;
    --muted: #9cb0c0;
    --line: #233a4c;
    --line-strong: #3b566b;
    --rule: rgba(121, 182, 226, 0.06);
    --accent: #7db8e3;
    --accent-strong: #acd3f1;
    --accent-wash: #16324a;
    --red-ink: #ff8f84;
    --ok: #79d39e;
    --ok-wash: #143524;
    --band: #102637;
    --band-ink: #e8f0f6;
    --band-muted: #a3b9ca;
    --band-line: #29475e;
    --band-raised: #163246;
    --code-bg: #08131c;
    --code-ink: #dae6ef;
    --code-muted: #8ea6b8;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -12px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #0c1720;
  --surface: #122130;
  --sunk: #0f1c28;
  --ink: #e3ebf1;
  --muted: #9cb0c0;
  --line: #233a4c;
  --line-strong: #3b566b;
  --rule: rgba(121, 182, 226, 0.06);
  --accent: #7db8e3;
  --accent-strong: #acd3f1;
  --accent-wash: #16324a;
  --red-ink: #ff8f84;
  --ok: #79d39e;
  --ok-wash: #143524;
  --band: #102637;
  --band-ink: #e8f0f6;
  --band-muted: #a3b9ca;
  --band-line: #29475e;
  --band-raised: #163246;
  --code-bg: #08131c;
  --code-ink: #dae6ef;
  --code-muted: #8ea6b8;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -12px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

/* ---------- Grundlagen ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.62;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--accent-strong);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.012em;
}

h1 {
  font-size: clamp(2.35rem, 1.35rem + 3.9vw, 4rem);
  line-height: 1.04;
}

h2 {
  font-size: clamp(1.8rem, 1.25rem + 1.9vw, 2.65rem);
  line-height: 1.12;
}

h3 {
  font-size: 1.13rem;
  line-height: 1.35;
  font-weight: 650;
}


p {
  margin: 0;
}

code,
kbd,
pre,
.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

:not(pre) > code {
  padding: 0.08em 0.36em;
  border-radius: 5px;
  background: var(--sunk);
  border: 1px solid var(--line);
  font-size: 0.86em;
  white-space: nowrap;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.skip-link:focus {
  top: 12px;
}

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

/* ---------- Kopfzeile ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

@supports (backdrop-filter: blur(8px)) or (-webkit-backdrop-filter: blur(8px)) {
  .site-header {
    background: color-mix(in srgb, var(--paper) 86%, transparent);
    -webkit-backdrop-filter: saturate(1.4) blur(10px);
    backdrop-filter: saturate(1.4) blur(10px);
  }
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--ink);
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
}

.brand-mark .mark-bg {
  fill: var(--band);
}

.brand-mark .mark-line {
  stroke: var(--band-ink);
}

.brand-mark .mark-total {
  stroke: var(--mark-red);
}

:root[data-theme="dark"] .brand-mark .mark-bg {
  fill: var(--accent-wash);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand-mark .mark-bg {
    fill: var(--accent-wash);
  }
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 8px 10px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover {
  color: var(--ink);
  background: var(--sunk);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Unterseiten ohne Navigation: Aktionen rechtsbündig */
.brand + .header-actions {
  margin-left: auto;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

.icon-button:hover {
  border-color: var(--line-strong);
}

.icon-button svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

.nav-toggle {
  display: none;
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.nav-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

/* Theme-Schalter braucht JavaScript; ohne Skript bleibt er verborgen. */
.theme-toggle[hidden] {
  display: none;
}

/* ---------- Schaltflächen ---------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 9px;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.button svg {
  width: 19px;
  height: 19px;
  flex: none;
}

.button-primary {
  background: var(--band);
  color: var(--band-ink);
}

.button-primary:hover {
  background: var(--accent-strong);
  color: #ffffff;
}

:root[data-theme="dark"] .button-primary {
  background: var(--accent);
  color: #08131c;
}

:root[data-theme="dark"] .button-primary:hover {
  background: var(--accent-strong);
  color: #08131c;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .button-primary {
    background: var(--accent);
    color: #08131c;
  }

  :root:not([data-theme="light"]) .button-primary:hover {
    background: var(--accent-strong);
    color: #08131c;
  }
}

.button-secondary {
  background: var(--surface);
  border-color: var(--line-strong);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.button-small {
  min-height: 40px;
  padding: 8px 14px;
  font-size: 0.93rem;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 35px,
    var(--rule) 35px,
    var(--rule) 36px
  );
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
  padding-block: clamp(48px, 8vw, 104px) clamp(48px, 7vw, 88px);
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 14ch;
}

.hero-lead {
  max-width: 36rem;
  margin-top: 24px;
  color: var(--muted);
  font-size: clamp(1.06rem, 0.98rem + 0.35vw, 1.22rem);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line-strong);
}

/* Buchungssatz als Kontenblatt */

.ledger {
  margin: 0;
  min-width: 0;
  padding: 22px 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.ledger-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem;
  color: var(--muted);
}

.ledger-no {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.5;
  white-space: nowrap;
}

.chip svg {
  width: 13px;
  height: 13px;
}

.chip-ok {
  background: var(--ok-wash);
  color: var(--ok);
}

.ledger-head .chip {
  margin-left: auto;
}

.ledger-text {
  margin-top: 14px;
  font-weight: 600;
  line-height: 1.4;
}

.ledger-sub {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.86rem;
}

.ledger-table-wrap {
  margin-top: 16px;
  overflow-x: auto;
}

.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.ledger-table th {
  padding: 6px 8px;
  border-bottom: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
}

.ledger-table th.num {
  text-align: right;
}

.ledger-table td {
  padding: 9px 8px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.ledger-table .acct {
  width: 3.6em;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
}

.ledger-table .partner {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.ledger-table tfoot td {
  border-bottom: 0;
  padding-top: 10px;
  font-weight: 700;
}

/* Doppelter Summenstrich wie im Kontobuch */
.ledger-table .total {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 3px double var(--red-ink);
}

.ledger-seal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
  color: var(--muted);
  font-size: 0.8rem;
}

.ledger-seal code {
  min-width: 0;
  color: var(--ink);
  font-size: 0.82rem;
  overflow-wrap: anywhere;
  white-space: normal;
}

.seal-label {
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ledger-caption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

/* Leistungsband unter dem Hero */

.capabilities {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.capabilities ul {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.capabilities li {
  padding: 18px 14px;
  border-left: 1px solid var(--line);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
}

.capabilities li:first-child {
  border-left: 0;
}

.capabilities .cap-label {
  display: block;
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- Abschnitte ---------- */

.section {
  padding-block: clamp(64px, 9vw, 112px);
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-alt {
  background: var(--surface);
}

.section-head {
  max-width: 48rem;
  margin-bottom: clamp(32px, 5vw, 52px);
}

.lead {
  margin-top: 18px;
  color: var(--muted);
  font-size: 1.12rem;
}

/* Zielgruppen */

.audiences {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.audience {
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.audience h3 {
  margin-bottom: 10px;
}

.audience p {
  color: var(--muted);
  font-size: 0.98rem;
}

/* Funktionsmodule */

.modules {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.module {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 24px 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.section-alt .module {
  background: var(--paper);
}

.module-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 16px;
  border-radius: 10px;
  background: var(--accent-wash);
  color: var(--accent);
}

.module-icon svg {
  width: 22px;
  height: 22px;
}

.module h3 {
  margin-bottom: 8px;
}

.module p {
  color: var(--muted);
  font-size: 0.96rem;
}

.module ul {
  display: grid;
  gap: 6px;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  font-size: 0.9rem;
}

.module li {
  position: relative;
  padding-left: 18px;
}

.module li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.55;
}

.module-note {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--sunk);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  vertical-align: 2px;
}

/* Ablauf vom Beleg zur Meldung (echte Reihenfolge, daher nummeriert) */

.steps {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 0 18px 0 0;
  counter-increment: step;
}

.step::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 18px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--paper);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.section-alt .step::before {
  background: var(--surface);
}

.step::after {
  content: "";
  position: absolute;
  top: 19px;
  left: 38px;
  right: 0;
  height: 2px;
  background: var(--line-strong);
}

.step:last-child::after {
  display: none;
}

.step h3 {
  margin-bottom: 8px;
  font-size: 1.02rem;
}

.step p {
  color: var(--muted);
  font-size: 0.93rem;
}

/* ---------- Reiter (Screenshots, Code) ---------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 18px;
  padding: 0;
}

.tab {
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
}

.tab:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

.tab[aria-selected="true"] {
  border-color: var(--band);
  background: var(--band);
  color: var(--band-ink);
}

:root[data-theme="dark"] .tab[aria-selected="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: #08131c;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .tab[aria-selected="true"] {
    border-color: var(--accent);
    background: var(--accent);
    color: #08131c;
  }
}

/* Ohne JavaScript bleiben alle Reiterinhalte untereinander sichtbar. */
.tabs[hidden] {
  display: none;
}

.panel + .panel {
  margin-top: 28px;
}

.js .panel + .panel {
  margin-top: 0;
}

/* Screenshot im Browserrahmen */

.shot {
  margin: 0;
}

.shot-frame {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.shot-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--sunk);
}

.shot-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line-strong);
}

.shot-bar .shot-url {
  width: auto;
  height: auto;
  margin-left: 10px;
  padding: 2px 12px;
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.shot img {
  width: 100%;
}

.shot figcaption {
  max-width: 50rem;
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.95rem;
}

.shot figcaption strong {
  color: var(--ink);
}

/* ---------- Steuern ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: start;
}

.facts {
  display: grid;
  gap: 22px;
  margin: 0;
}

.facts div {
  padding-left: 18px;
  border-left: 2px solid var(--line-strong);
}

.facts dt {
  margin-bottom: 4px;
  font-weight: 650;
}

.facts dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.97rem;
}

/* UStVA im Stil des amtlichen Vordrucks: Kennzahl im Kästchen, Betrag rechts */

.form-card {
  margin: 0;
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.form-card-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line-strong);
}

.form-card-title {
  font-weight: 700;
}

.form-card-meta {
  color: var(--muted);
  font-size: 0.85rem;
}

.kz-list {
  margin: 0;
  padding: 6px 20px 4px;
}

.kz {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.kz:last-child {
  border-bottom: 0;
}

.kz dt {
  display: contents;
}

.kz-no {
  display: inline-grid;
  place-items: center;
  min-width: 38px;
  height: 28px;
  padding: 0 6px;
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.kz-label {
  font-size: 0.93rem;
  line-height: 1.35;
}

.kz dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

.kz-total .kz-label {
  font-weight: 700;
}

.kz-total dd {
  padding-bottom: 2px;
  border-bottom: 3px double var(--red-ink);
  font-weight: 700;
}

.form-card-foot {
  padding: 14px 20px 16px;
  border-top: 1px solid var(--line-strong);
  background: var(--sunk);
  border-radius: 0 0 var(--radius) var(--radius);
  color: var(--muted);
  font-size: 0.85rem;
}

.form-card-foot strong {
  color: var(--ink);
}

/* ---------- Prüfbarkeit: Hashkette ---------- */

.chain {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chain-entry {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.chain-entry + .chain-entry {
  margin-top: 30px;
}

.chain-entry + .chain-entry::before {
  content: "";
  position: absolute;
  left: 34px;
  top: -31px;
  width: 2px;
  height: 30px;
  background: repeating-linear-gradient(to bottom, var(--accent) 0 5px, transparent 5px 9px);
}

.chain-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
}

.chain-seq {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
}

.chain-action {
  font-weight: 650;
}

.chain-object {
  color: var(--muted);
  font-size: 0.88rem;
}

.chain-hashes {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 12px;
  margin: 10px 0 0;
  font-size: 0.8rem;
}

.chain-hashes dt {
  color: var(--muted);
}

.chain-hashes dd {
  margin: 0;
  font-family: var(--font-mono);
  overflow-wrap: anywhere;
}

.chain-hashes .linked {
  color: var(--accent);
}

.terminal {
  margin: 30px 0 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.6;
  overflow-x: auto;
}

.terminal .prompt {
  color: var(--code-muted);
  user-select: none;
}

.terminal .ok {
  color: #8fe0ab;
}

/* ---------- Schnittstellen (dunkles Band) ---------- */

.band {
  background: var(--band);
  color: var(--band-ink);
  border-top: 0;
}

.section + .band,
.band + .section {
  border-top: 0;
}

.band h2,
.band h3 {
  color: var(--band-ink);
}

.band .eyebrow {
  color: var(--band-muted);
}

.band .lead {
  color: var(--band-muted);
}

.band a {
  color: var(--band-ink);
}

.interfaces {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
  margin-bottom: clamp(40px, 6vw, 64px);
}

.interface {
  padding-top: 18px;
  border-top: 1px solid var(--band-line);
}

.interface h3 {
  margin-bottom: 10px;
}

.interface p {
  color: var(--band-muted);
  font-size: 0.96rem;
}

.band .tab {
  border-color: var(--band-line);
  background: transparent;
  color: var(--band-muted);
}

.band .tab:hover {
  color: var(--band-ink);
  border-color: var(--band-muted);
}

.band .tab[aria-selected="true"],
:root[data-theme="dark"] .band .tab[aria-selected="true"] {
  border-color: var(--band-ink);
  background: var(--band-ink);
  color: var(--band);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .band .tab[aria-selected="true"] {
    border-color: var(--band-ink);
    background: var(--band-ink);
    color: var(--band);
  }
}

.code-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.code-block {
  position: relative;
  margin: 0;
  min-width: 0;
  border: 1px solid var(--band-line);
  border-radius: var(--radius);
  background: var(--code-bg);
}

.code-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 10px 8px 16px;
  border-bottom: 1px solid var(--band-line);
  color: var(--code-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.code-block pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  color: var(--code-ink);
  font-size: 0.82rem;
  line-height: 1.65;
  tab-size: 2;
}

.code-block .c-comment {
  color: var(--code-muted);
}

.code-block .c-key {
  color: #9fd0f5;
}

.code-block .c-str {
  color: #b9e3a6;
}

.code-block .c-cmd {
  color: #f3d58c;
}

.copy-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 4px 10px;
  border: 1px solid var(--band-line);
  border-radius: 6px;
  background: transparent;
  color: var(--code-muted);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.copy-button:hover {
  color: var(--code-ink);
  border-color: var(--code-muted);
}

.copy-button[hidden] {
  display: none;
}

.parity {
  min-width: 0;
}

.parity h3 {
  margin-bottom: 12px;
}

.parity p {
  margin-bottom: 16px;
  color: var(--band-muted);
  font-size: 0.95rem;
}

.table-scroll {
  overflow-x: auto;
}

.parity table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.parity th {
  padding: 8px 10px 8px 0;
  border-bottom: 1px solid var(--band-muted);
  color: var(--band-muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
}

.parity td {
  padding: 9px 10px 9px 0;
  border-bottom: 1px solid var(--band-line);
  vertical-align: top;
}

.parity td:first-child {
  font-weight: 600;
}

.parity code {
  display: block;
  width: fit-content;
  max-width: 100%;
  border-color: var(--band-line);
  background: var(--band-raised);
  color: var(--band-ink);
  font-size: 0.76rem;
  white-space: normal;
  overflow-wrap: anywhere;
}

.parity code + code {
  margin-top: 4px;
}

/* ---------- Betrieb & Sicherheit ---------- */

.columns-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(28px, 5vw, 64px);
}

.checklist {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding-left: 30px;
  color: var(--muted);
}

.checklist li strong {
  color: var(--ink);
  font-weight: 650;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.32em;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background-color: var(--accent-wash);
  background-image: linear-gradient(var(--accent), var(--accent)), linear-gradient(var(--accent), var(--accent));
  background-size: 2px 9px, 9px 2px;
  background-position: 8px 4.5px, 4.5px 8px;
  background-repeat: no-repeat;
}

.checklist.is-gaps li::before {
  background-image: linear-gradient(var(--muted), var(--muted));
  background-size: 9px 2px;
  background-position: 4.5px 8px;
  background-color: var(--sunk);
}

/* ---------- Installation ---------- */

.install {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.install .code-block {
  border-color: var(--line-strong);
}

.install .code-block-head {
  border-bottom-color: var(--line-strong);
}

.install .copy-button {
  border-color: var(--code-muted);
}

.note {
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--accent-wash);
  font-size: 0.93rem;
}

.note + .note {
  margin-top: 10px;
}

/* ---------- Status & FAQ ---------- */

.faq {
  max-width: 52rem;
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq details:first-of-type {
  border-top: 1px solid var(--line);
}

.faq summary {
  position: relative;
  padding: 20px 44px 20px 0;
  font-weight: 650;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -8px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
}

.faq details[open] summary::after {
  margin-top: -2px;
  transform: rotate(225deg);
}

.faq details p {
  padding: 0 0 22px;
  color: var(--muted);
}

.faq details p + p {
  margin-top: -10px;
}

/* ---------- Mitmachen ---------- */

.contribute {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.link-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.link-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.link-list li:first-child a {
  border-top: 1px solid var(--line);
}

.link-list a:hover {
  color: var(--accent);
}

.link-list .link-meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  white-space: nowrap;
}

/* ---------- Fußzeile ---------- */

.site-footer {
  padding-block: 44px 52px;
  background: var(--band);
  color: var(--band-muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px 40px;
}

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

.site-footer .brand-mark .mark-bg {
  fill: var(--band-raised);
}

.footer-text {
  max-width: 34rem;
  margin-top: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

/* ---------- Rechtstexte und Fehlerseite ---------- */

.page {
  padding-block: clamp(48px, 7vw, 88px);
}

.prose {
  max-width: 44rem;
}

.prose h1 {
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3rem);
  margin-bottom: 12px;
}

.prose h2 {
  margin-top: 40px;
  margin-bottom: 12px;
  font-size: 1.45rem;
}

.prose h3 {
  margin-top: 24px;
  margin-bottom: 8px;
}

.prose p,
.prose ul,
.prose address {
  margin: 0 0 14px;
}

.prose address {
  font-style: normal;
}

.prose ul {
  padding-left: 22px;
}

.prose li + li {
  margin-top: 4px;
}

.prose .summary {
  margin: 20px 0 8px;
  padding: 18px 20px;
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--accent-wash);
}

.prose .meta {
  color: var(--muted);
}

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

@media (max-width: 1120px) {
  .site-nav a {
    padding-inline: 7px;
    font-size: 0.9rem;
  }

  .capabilities ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .capabilities li:nth-child(4) {
    border-left: 0;
  }

  .capabilities li:nth-child(n + 4) {
    border-top: 1px solid var(--line);
  }

  .interfaces {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    row-gap: 36px;
  }

  .step:nth-child(3)::after {
    display: none;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-grid;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    padding: 8px var(--gutter) 16px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

  .js .site-nav:not(.is-open) {
    display: none;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav a {
    padding: 12px 10px;
    font-size: 1rem;
  }

  .header-actions {
    margin-left: auto;
  }

  .hero-inner,
  .split,
  .code-grid,
  .install,
  .contribute,
  .columns-2 {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero h1 {
    max-width: 16ch;
  }

  .modules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .audiences {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Ohne JavaScript steht die Navigation unter der Kopfzeile. */
@media (max-width: 960px) {
  html:not(.js) .site-header {
    position: static;
  }

  html:not(.js) .site-nav {
    position: static;
    box-shadow: none;
    border-bottom: 0;
    padding-inline: 0;
  }

  html:not(.js) .header-inner {
    flex-wrap: wrap;
  }

  html:not(.js) .site-nav ul {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 1rem;
  }

  p,
  li,
  dd,
  h3 {
    hyphens: auto;
  }

  .github-label {
    display: none;
  }

  .header-inner {
    gap: 10px;
  }

  .header-actions {
    gap: 6px;
  }

  .header-home {
    display: none;
  }

  .modules,
  .audiences,
  .interfaces {
    grid-template-columns: minmax(0, 1fr);
  }

  .capabilities ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .capabilities li:nth-child(4) {
    border-left: 1px solid var(--line);
  }

  .capabilities li:nth-child(odd) {
    border-left: 0;
  }

  .capabilities li:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .steps {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 0;
  }

  .step {
    padding: 0 0 26px 56px;
  }

  .step::before {
    position: absolute;
    left: 0;
    top: -6px;
    margin: 0;
  }

  .step::after,
  .step:nth-child(3)::after {
    display: block;
    top: 34px;
    left: 18px;
    right: auto;
    bottom: 0;
    width: 2px;
    height: auto;
  }

  .step:last-child::after {
    display: none;
  }

  .ledger {
    padding: 18px 12px 14px;
  }

  .ledger-table {
    font-size: 0.82rem;
  }

  .ledger-table th,
  .ledger-table td {
    padding-inline: 3px;
  }

  .ledger-table .acct {
    width: auto;
  }

  .ledger-table .partner {
    font-size: 0.74rem;
  }

  .ledger-head .chip {
    margin-left: 0;
  }

  .kz-list,
  .form-card-head,
  .form-card-foot {
    padding-inline: 14px;
  }

  .kz {
    gap: 10px;
  }

  .shot-bar .shot-url {
    display: none;
  }

  .hero-actions .button {
    flex: 1 1 100%;
  }
}

@media (max-width: 380px) {
  .brand {
    font-size: 1rem;
  }

  .header-github {
    display: none;
  }
}

@media print {
  .site-header,
  .tabs,
  .copy-button,
  .theme-toggle,
  .nav-toggle {
    display: none !important;
  }

  .panel[hidden] {
    display: block !important;
  }

  body {
    background: #ffffff;
    color: #000000;
  }
}