/* Layout: Prüfkatalog-Raster – schmale Kennungsspalte links (Regelwerk-Referenzen in Mono), Inhalt rechts.
   Keine externen Schriften oder Ressourcen: Systemschriften, damit keine Daten an Dritte gehen. */
:root {
  --bg: #f3f6f7;
  --surface: #ffffff;
  --ink: #12202a;
  --muted: #566874;
  --line: #d3dde3;
  --accent: #0a6668;
  --accent-soft: #e0eeee;
  --mark: #b7791f;
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.5rem;
  --step-3: 2.125rem;
  --step-4: clamp(2.25rem, 5.2vw, 3.6rem);
  --wrap: 72rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e161b; --surface: #152027; --ink: #e2eaee; --muted: #93a6b1;
    --line: #26353e; --accent: #5cbcb6; --accent-soft: #173033; --mark: #e0a74a;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e161b; --surface: #152027; --ink: #e2eaee; --muted: #93a6b1;
  --line: #26353e; --accent: #5cbcb6; --accent-soft: #173033; --mark: #e0a74a;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
}
img { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--bg); padding: 0.5rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; }
.mono { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.02em; }
.label { font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); }

/* Kopf */
.site-head {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 0.85rem; flex-wrap: wrap; }
.brand { display: flex; flex-direction: column; text-decoration: none; color: var(--ink); line-height: 1.2; }
.brand strong { font-family: var(--font-display); font-size: var(--step-1); font-weight: 600; }
.brand span { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.06em; }
.nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; font-size: 0.9375rem; }
.nav a { color: var(--ink); text-decoration: none; padding-block: 0.25rem; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { border-bottom-color: var(--accent); }

/* Hero */
.hero { padding-block: clamp(3rem, 8vw, 6rem) clamp(2.5rem, 6vw, 4.5rem); border-bottom: 1px solid var(--line); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4rem); align-items: end; }
.hero h1 { font-size: var(--step-4); max-width: 16ch; }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero .lead { margin-top: 1.5rem; font-size: var(--step-1); color: var(--muted); max-width: 52ch; }
.hero .cta { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.7rem 1.15rem; border-radius: 3px; font-weight: 600; font-size: 0.9375rem; text-decoration: none; border: 1px solid var(--accent); }
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: var(--ink); border-color: var(--ink); }
.btn-ghost { color: var(--accent); }
.btn-ghost:hover { background: var(--accent-soft); }

/* Prüfvermerk */
.record { background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--accent); padding: 1.25rem 1.35rem 1.35rem; }
.record-head { display: flex; justify-content: space-between; gap: 1rem; padding-bottom: 0.75rem; border-bottom: 1px dashed var(--line); }
.record dl { margin: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.6rem 1rem; padding-top: 0.9rem; }
.record dt { font-family: var(--font-mono); font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; padding-top: 0.15rem; }
.record dd { margin: 0; font-size: 0.9375rem; }
.stamp { font-family: var(--font-mono); font-size: 0.72rem; color: var(--mark); border: 1px solid var(--mark); padding: 0.1rem 0.45rem; border-radius: 2px; white-space: nowrap; align-self: start; }

/* Abschnitte */
.section { padding-block: clamp(3rem, 7vw, 5rem); border-bottom: 1px solid var(--line); }
.section-head { display: grid; gap: 0.75rem; margin-bottom: 2.5rem; }
.section-head h2 { font-size: var(--step-3); max-width: 24ch; }
.section-head p:not(.label) { color: var(--muted); max-width: 62ch; }

.rows { display: grid; border-top: 1px solid var(--line); }
.row { display: grid; grid-template-columns: 13rem minmax(0, 1fr); gap: 0.5rem 2.5rem; padding-block: 1.6rem; border-bottom: 1px solid var(--line); }
.row-ref { display: flex; flex-direction: column; gap: 0.3rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); }
.row h3 { font-size: var(--step-2); margin-bottom: 0.6rem; }
.row p { max-width: 64ch; }
.row ul { margin: 0.8rem 0 0; padding-left: 1.1rem; max-width: 64ch; }
.row li + li { margin-top: 0.25rem; }

/* Vorgehen */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); border: 1px solid var(--line); background: var(--surface); counter-reset: step; }
.steps li { padding: 1.1rem 1rem 1.25rem; border-right: 1px solid var(--line); counter-increment: step; display: flex; flex-direction: column; gap: 0.4rem; }
.steps li:last-child { border-right: 0; }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent); }
.steps strong { font-size: 0.9375rem; line-height: 1.3; }
.steps span { font-size: var(--step--1); color: var(--muted); line-height: 1.45; }
.steps-note { margin-top: 1rem; color: var(--muted); font-size: 0.9375rem; }

/* Regelwerke */
.frameworks { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 2rem 2.5rem; }
.frameworks h3 { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin-bottom: 0.8rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--line); }
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; list-style: none; margin: 0; padding: 0; }
.chips li { font-family: var(--font-mono); font-size: 0.8rem; padding: 0.2rem 0.55rem; background: var(--surface); border: 1px solid var(--line); border-radius: 2px; }
.chips li.key { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* Referenzen */
.timeline { display: grid; border-top: 1px solid var(--line); }
.ref { display: grid; grid-template-columns: 13rem minmax(0, 1fr) auto; gap: 0.4rem 2.5rem; padding-block: 1.25rem; border-bottom: 1px solid var(--line); align-items: baseline; }
.ref time { font-family: var(--font-mono); font-size: 0.82rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.ref h3 { font-family: var(--font-body); font-size: var(--step-0); font-weight: 650; letter-spacing: 0; }
.ref p { color: var(--muted); font-size: 0.9375rem; margin-top: 0.2rem; max-width: 66ch; }
.ref .sector { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent); white-space: nowrap; }
.footnote { margin-top: 1.25rem; font-size: var(--step--1); color: var(--muted); }

/* Qualifikation */
.quals { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.quals > div { background: var(--surface); padding: 1.4rem 1.4rem 1.5rem; }
.quals h3 { font-size: var(--step-1); margin-bottom: 0.75rem; }
.quals ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.45rem; }
.quals li { font-size: 0.9375rem; padding-left: 1rem; position: relative; }
.quals li::before { content: ""; position: absolute; left: 0; top: 0.6em; width: 0.4rem; height: 1px; background: var(--accent); }

/* Kontakt */
.contact .wrap { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 2.5rem; align-items: start; }
.contact h2 { font-size: var(--step-3); }
.contact p.lead { margin-top: 1rem; color: var(--muted); max-width: 52ch; }
.contact-card { background: var(--surface); border: 1px solid var(--line); padding: 1.5rem; display: grid; gap: 1rem; }
.contact-card div { display: grid; gap: 0.15rem; }
.contact-card a { font-size: var(--step-1); font-weight: 600; text-decoration: none; word-break: break-word; }
.contact-card a:hover { text-decoration: underline; }
.contact-card small { color: var(--muted); font-size: var(--step--1); }

/* Fuß */
.site-foot { padding-block: 2rem 2.5rem; font-size: 0.875rem; color: var(--muted); }
.site-foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
.site-foot nav { display: flex; gap: 1.5rem; }
.site-foot a { color: var(--ink); }

/* Rechtstexte */
.legal { padding-block: clamp(2.5rem, 6vw, 4rem) clamp(3rem, 7vw, 5rem); }
.legal .wrap { max-width: 48rem; }
.legal h1 { font-size: var(--step-3); margin-bottom: 0.5rem; }
.legal .meta { color: var(--muted); margin-bottom: 2.5rem; }
.legal h2 { font-size: var(--step-2); margin: 2.5rem 0 0.75rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.legal h3 { font-family: var(--font-body); font-size: var(--step-0); font-weight: 650; margin: 1.5rem 0 0.4rem; letter-spacing: 0; }
.legal p, .legal ul { max-width: 65ch; }
.legal p + p { margin-top: 0.75rem; }
.legal ul { padding-left: 1.2rem; margin: 0.5rem 0 0; }
.legal address { font-style: normal; }
.legal .box { margin-top: 1rem; padding: 1rem 1.2rem; background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); }
mark.todo { background: #fde9b8; color: #4a3200; padding: 0 0.25rem; border-radius: 2px; }

/* Responsiv */
@media (max-width: 60rem) {
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .steps li:nth-child(3) { border-right: 0; }
  .steps li:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
  .quals { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 48rem) {
  .hero .wrap, .contact .wrap { grid-template-columns: minmax(0, 1fr); }
  .row { grid-template-columns: minmax(0, 1fr); }
  .row-ref { flex-direction: row; flex-wrap: wrap; gap: 0.25rem 1rem; }
  .ref { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .steps li { border-right: 0; border-bottom: 1px solid var(--line); flex-direction: row; flex-wrap: wrap; gap: 0.2rem 0.75rem; }
  .steps li:last-child { border-bottom: 0; }
  .steps span { flex-basis: 100%; }
  .site-head .wrap { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}