/* prozent-rechner.eu — System-Schriften, keine externen Ressourcen */
:root {
  --bg: #f6f4ee;
  --surface: #ffffff;
  --surface-2: #efece3;
  --ink: #1b2430;
  --ink-2: #4a5563;
  --line: #dcd7c9;
  --accent: #0b6e64;
  --accent-ink: #ffffff;
  --accent-soft: #e2f1ee;
  --accent-line: #9ccfc6;
  --mark: #e8a33d;
  --error: #b42318;
  --error-soft: #fdecea;
  --warn: #8a5a00;
  --warn-soft: #fff4dc;
  --focus: #1f6feb;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(27, 36, 48, .06), 0 6px 24px rgba(27, 36, 48, .06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181d; --surface: #1c2229; --surface-2: #232a33; --ink: #e8ecf1; --ink-2: #a9b3bf;
    --line: #333c47; --accent: #4cc2b2; --accent-ink: #0b1f1c; --accent-soft: #17302d; --accent-line: #2b5f58;
    --mark: #f0b75a; --error: #ff8a80; --error-soft: #3a1f1d; --warn: #f3c46b; --warn-soft: #362b14;
    --focus: #79b8ff; --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14181d; --surface: #1c2229; --surface-2: #232a33; --ink: #e8ecf1; --ink-2: #a9b3bf;
  --line: #333c47; --accent: #4cc2b2; --accent-ink: #0b1f1c; --accent-soft: #17302d; --accent-line: #2b5f58;
  --mark: #f0b75a; --error: #ff8a80; --error-soft: #3a1f1d; --warn: #f3c46b; --warn-soft: #362b14;
  --focus: #79b8ff; --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.6 var(--font); }
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

/* Kopf */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.1rem; letter-spacing: -.01em; }
.bm-bg { fill: var(--accent); }
.bm-fg { fill: none; stroke: var(--accent-ink); stroke-width: 2.4; }
.bm-line { stroke: var(--mark); stroke-width: 2.8; stroke-linecap: round; }
.theme-toggle { background: none; border: 1px solid var(--line); color: var(--ink-2); border-radius: 999px; width: 40px; height: 40px; display: grid; place-items: center; cursor: pointer; }
.no-js .theme-toggle { display: none; }
.main-nav { border-top: 1px solid var(--line); }
.main-nav ul { list-style: none; display: flex; gap: 4px; overflow-x: auto; padding-top: 6px; padding-bottom: 6px; margin: 0 auto; scrollbar-width: none; }
.main-nav ul::-webkit-scrollbar { display: none; }
.main-nav a { display: block; white-space: nowrap; padding: 6px 12px; border-radius: 999px; color: var(--ink-2); text-decoration: none; font-size: .95rem; }
.main-nav a:hover { background: var(--surface-2); color: var(--ink); }
.main-nav a[aria-current="page"] { background: var(--accent-soft); color: var(--ink); font-weight: 600; }

/* Inhalt */
main { padding-top: 12px; padding-bottom: 48px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 4px 0 0; font-size: .88rem; color: var(--ink-2); }
.crumbs li + li::before { content: "›"; margin-right: 6px; }
h1 { font-size: clamp(1.55rem, 4.6vw, 2.3rem); line-height: 1.2; letter-spacing: -.02em; margin: 10px 0 6px; }
h2 { font-size: clamp(1.25rem, 3.2vw, 1.55rem); line-height: 1.3; margin: 2.2em 0 .6em; letter-spacing: -.01em; }
h3 { font-size: 1.1rem; margin: 1.6em 0 .4em; }
.lead { color: var(--ink-2); margin: 0 0 14px; max-width: 70ch; }
p, li { max-width: 72ch; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: .25em 0; }
code, .formula { font-family: var(--mono); font-size: .95em; }
.formula { display: inline-block; background: var(--surface-2); border-radius: 8px; padding: 2px 8px; }
.formula-block { display: block; background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 10px; padding: 12px 16px; font-family: var(--mono); margin: 12px 0; overflow-x: auto; }
.note { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; }
.note-warn { background: var(--warn-soft); border-color: transparent; }

/* Rechner */
.calc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); margin: 8px 0 28px; overflow: hidden; }
.calc-tabs { display: flex; overflow-x: auto; gap: 2px; padding: 6px 6px 0; background: var(--surface-2); border-bottom: 1px solid var(--line); scrollbar-width: thin; }
.tab { flex: 0 0 auto; padding: 10px 14px; border-radius: 10px 10px 0 0; color: var(--ink-2); text-decoration: none; font-weight: 600; font-size: .95rem; white-space: nowrap; border: 1px solid transparent; border-bottom: 0; }
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { background: var(--surface); color: var(--ink); border-color: var(--line); margin-bottom: -1px; }
.calc-panel { padding: 16px; }
.calc-panel + .calc-panel { border-top: 1px solid var(--line); }
.js .calc-panel.is-inactive { display: none; }
.js .calc-panel + .calc-panel { border-top: 0; }
.panel-title { margin: 0 0 10px; font-weight: 700; font-size: 1.05rem; }
.fields { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.field label, .seg legend { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 4px; color: var(--ink-2); }
.input-wrap { position: relative; }
.input-wrap input { width: 100%; font: inherit; font-size: 1.15rem; font-variant-numeric: tabular-nums; padding: 10px 12px; min-height: 48px; border: 1.5px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); }
.input-wrap.has-unit input { padding-right: 40px; }
.input-wrap input:focus { border-color: var(--accent); outline: 3px solid var(--accent-soft); outline-offset: 0; }
.input-wrap input[aria-invalid="true"] { border-color: var(--error); }
.unit { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: var(--ink-2); font-weight: 600; pointer-events: none; }
.field-error { color: var(--error); font-size: .88rem; margin: 4px 0 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.chip { font: inherit; font-size: .85rem; padding: 4px 10px; border: 1px solid var(--accent-line); background: var(--accent-soft); color: var(--ink); border-radius: 999px; cursor: pointer; }
.no-js .chips { display: none; }
.seg { border: 0; padding: 0; margin: 0; grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.seg legend { width: 100%; }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.seg label { padding: 8px 14px; border: 1.5px solid var(--line); border-radius: 999px; cursor: pointer; font-size: .95rem; background: var(--bg); }
.seg input:checked + label { border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.seg input:focus-visible + label { outline: 3px solid var(--focus); outline-offset: 2px; }
.calc-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; margin-top: 14px; }
.btn { font: inherit; font-weight: 600; border-radius: 10px; padding: 10px 18px; cursor: pointer; border: 1.5px solid transparent; min-height: 44px; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); font-weight: 500; padding: 6px 12px; min-height: 38px; font-size: .92rem; }
.prec { font-size: .9rem; color: var(--ink-2); display: inline-flex; gap: 6px; align-items: center; }
.prec input { width: 18px; height: 18px; accent-color: var(--accent); }

.result-slot { margin-top: 14px; }
.result { background: var(--accent-soft); border: 1px solid var(--accent-line); border-radius: 12px; padding: 14px 16px; }
.result.is-error { background: var(--error-soft); border-color: transparent; }
.result-label { margin: 0; font-size: .9rem; font-weight: 600; color: var(--ink-2); }
.result-value { margin: 2px 0 4px; font-size: clamp(1.8rem, 7vw, 2.4rem); font-weight: 750; line-height: 1.15; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.result-value output { color: var(--ink); }
.result-unit { color: var(--ink-2); font-weight: 600; }
.result-extra { list-style: none; padding: 0; margin: 0 0 6px; display: flex; flex-wrap: wrap; gap: 4px 20px; }
.result-extra span { color: var(--ink-2); }
.result-sentence { margin: 4px 0; }
.result-warning { background: var(--warn-soft); color: var(--warn); border-radius: 8px; padding: 6px 10px; font-size: .92rem; }
.result-error { color: var(--error); margin: 0; font-weight: 600; }
.result-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 4px; }
.no-js .result-actions { display: none; }
.steps { margin-top: 8px; }
.steps summary { cursor: pointer; font-weight: 600; color: var(--accent); padding: 4px 0; }
.steps dl { margin: 8px 0 0; display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; font-size: .95rem; }
.steps dt { font-weight: 600; color: var(--ink-2); grid-column: 1; }
.steps dd { margin: 0; grid-column: 2; font-family: var(--mono); font-size: .92rem; overflow-wrap: anywhere; }
@media (max-width: 520px) {
  .steps dl { grid-template-columns: 1fr; }
  .steps dt { margin-top: 6px; }
  .steps dd { grid-column: 1; }
  .calc-panel { padding: 14px 12px; }
}

/* Tabellen */
.table-wrap { overflow-x: auto; margin: 12px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--surface-2); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Karten / verwandte Rechner */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; padding: 0; list-style: none; }
.cards li { max-width: none; }
.cards a { display: block; height: 100%; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: var(--ink); }
.cards a:hover { border-color: var(--accent); }
.cards strong { display: block; color: var(--accent); }
.cards span { font-size: .92rem; color: var(--ink-2); }

/* FAQ */
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; margin: 8px 0; }
.faq summary { cursor: pointer; padding: 12px 16px; font-weight: 600; }
.faq details > div { padding: 0 16px 12px; }
.faq details > div p:first-child { margin-top: 0; }

/* Übungen */
.trainer { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; margin: 8px 0 28px; }
.no-js .trainer { display: none; }
.trainer-levels { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.trainer-task { font-size: 1.15rem; font-weight: 600; margin: 8px 0 12px; }
.trainer-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.trainer-form .field { flex: 1 1 200px; }
.trainer-feedback { margin-top: 12px; }
.trainer-score { color: var(--ink-2); font-size: .92rem; }
.tasklist { counter-reset: t; padding: 0; list-style: none; }
.tasklist > li { counter-increment: t; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px 12px 52px; margin: 10px 0; position: relative; max-width: none; }
.tasklist > li::before { content: counter(t); position: absolute; left: 14px; top: 12px; width: 26px; height: 26px; border-radius: 50%; background: var(--accent-soft); color: var(--ink); display: grid; place-items: center; font-weight: 700; font-size: .85rem; }
.tasklist details summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.level { font-size: .8rem; font-weight: 600; color: var(--ink-2); text-transform: uppercase; letter-spacing: .04em; }

/* Formular Kontakt */
.form-grid { display: grid; gap: 12px; max-width: 560px; }
.form-grid label { font-weight: 600; font-size: .92rem; color: var(--ink-2); display: block; margin-bottom: 4px; }
.form-grid input, .form-grid textarea { width: 100%; font: inherit; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); }
.form-grid textarea { min-height: 160px; resize: vertical; }
.hp { position: absolute; left: -5000px; }
.msg-ok { background: var(--accent-soft); padding: 12px 16px; border-radius: 12px; }
.msg-err { background: var(--error-soft); color: var(--error); padding: 12px 16px; border-radius: 12px; }

/* Fuß */
.site-footer { background: var(--surface); border-top: 1px solid var(--line); padding: 28px 0 36px; font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.footer-h { font-weight: 700; margin: 0 0 6px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 4px 0; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; }
.footer-note { color: var(--ink-2); font-size: .88rem; }

@media print {
  .site-header, .site-footer, .calc, .trainer, .skip, .crumbs, .result-actions { display: none !important; }
  body { background: #fff; color: #000; font-size: 12pt; }
  .tasklist details { display: block; }
  .tasklist details > summary { display: none; }
  .tasklist details:not([open]) > *:not(summary) { display: block; }
  a { color: #000; }
  .table-wrap, .formula-block { border-color: #999; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }