:root {
  --ink: #16181c;
  --muted: #545a63;
  --line: #d4d8de;
  --bg: #ffffff;
  --soft: #f4f5f7;
  --accent: #1d4f91;
  --warn: #7a4a00;
  --warnbg: #fdf3e0;
  --red: #8a1f11;
  --redbg: #fbeceb;
  --okbg: #eef4ee;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 0 1rem 4rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

header, .tabs, main, footer { max-width: 62rem; margin: 0 auto; }

header { padding: 2rem 0 1rem; }

h1 { font-size: 1.6rem; margin: 0 0 .6rem; letter-spacing: -0.01em; }
h2 { font-size: 1.15rem; margin: 0 0 .6rem; }
h3 { font-size: 1rem; margin: 1.4rem 0 .4rem; }

p { margin: 0 0 .8rem; }

.lede { font-size: 1.02rem; max-width: 52rem; }

.local {
  background: var(--soft);
  border-left: 3px solid var(--accent);
  padding: .7rem .9rem;
  margin: 1rem 0 0;
  max-width: 52rem;
}

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

section {
  border-top: 1px solid var(--line);
  padding: 1.4rem 0;
}

blockquote {
  margin: .6rem 0;
  padding: .6rem .9rem;
  background: var(--soft);
  border-left: 3px solid var(--line);
}

blockquote p { margin: 0 0 .5rem; }
blockquote p:last-child { margin-bottom: 0; }

.src, .why, .note, .formula { color: var(--muted); font-size: .88rem; }
.note { border-left: 3px solid var(--accent); padding-left: .7rem; }
.why { margin: .2rem 0 .6rem 1.7rem; }
.formula { max-width: 52rem; }

.assume {
  display: inline-block;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  background: var(--warnbg);
  color: var(--warn);
  border: 1px solid #e6d3ae;
  border-radius: 2px;
  padding: 0 .35rem;
  margin-left: .35rem;
  vertical-align: 1px;
}

/* ------------------------------------------------------------ Reiter */

.tabs { padding-top: .6rem; }

[role="tablist"] {
  display: flex;
  gap: .3rem;
  border-bottom: 2px solid var(--line);
}

[role="tab"] {
  font: inherit;
  font-weight: 600;
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  padding: .5rem .9rem;
  cursor: pointer;
  color: var(--muted);
}

[role="tab"][aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

[role="tabpanel"]:focus { outline: none; }

/* ---------------------------------------------------- Eingabeelemente */

label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: .2rem; }

input[type="text"], input[type="month"], select, input[type="file"] {
  font: inherit;
  font-size: .95rem;
  padding: .35rem .45rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #fff;
  color: var(--ink);
  max-width: 100%;
}

input[type="text"], input[type="month"], select { width: 100%; }

button {
  font: inherit;
  font-size: .92rem;
  padding: .4rem .8rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--soft);
  color: var(--ink);
  cursor: pointer;
  margin: 0 .3rem .3rem 0;
}

button:hover { background: #e9ebef; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: .3rem 1rem;
}

.grid p { margin-bottom: .5rem; }

.toggles { list-style: none; padding: 0; margin: .8rem 0 0; }
.toggles li { margin-bottom: .5rem; }
.toggles input { margin-right: .4rem; }
.toggles label { display: inline; font-weight: 400; font-size: 1rem; }

.fileinfo { font-size: .9rem; color: var(--muted); }

.copystate { font-size: .88rem; color: var(--muted); margin-left: .4rem; }

/* --------------------------------------------------------- Tabellen */

.scroll { overflow-x: auto; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: .9rem;
  margin: .5rem 0 1rem;
}

caption {
  text-align: left;
  font-size: .85rem;
  color: var(--muted);
  padding-bottom: .3rem;
}

th, td {
  border: 1px solid var(--line);
  padding: .3rem .5rem;
  text-align: left;
  vertical-align: top;
}

thead th { background: var(--soft); }

td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

tbody tr.total th, tbody tr.total td { font-weight: 700; background: var(--soft); }

/* --------------------------------------------------------- Meldungen */

.warn, .checks li {
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: .45rem .7rem;
  margin: 0 0 .4rem;
  font-size: .92rem;
}

.checks { list-style: none; padding: 0; margin: .5rem 0 1rem; }
.checks li.ok { background: var(--okbg); }
.checks li.warn { background: var(--warnbg); color: var(--warn); }
.checks li.red { background: var(--redbg); color: var(--red); border-color: #e2b3ad; font-weight: 600; }

.headline {
  background: var(--soft);
  padding: .55rem .8rem;
  border-left: 3px solid var(--accent);
  font-size: .98rem;
}

.letter {
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .8rem;
  line-height: 1.45;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: .8rem;
  overflow-x: auto;
}

footer {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  margin-top: 2rem;
  font-size: .88rem;
  color: var(--muted);
}

/* ------------------------------------------------------------ Druck */

@media print {
  body { padding: 0; font-size: 11pt; }
  .tabs, button, input, select, .toggles, .local, .mapping, .assume { display: none; }
  section { border-top: none; page-break-inside: avoid; }
  .letter { border: none; background: none; padding: 0; font-size: 9.5pt; }
  a { color: inherit; text-decoration: none; }
}

@media (max-width: 30rem) {
  body { padding: 0 .6rem 3rem; }
  h1 { font-size: 1.35rem; }
  table { font-size: .82rem; }
  [role="tab"] { padding: .5rem .55rem; }
}