/* =============================================================
   Brutto-Netto-Rechner — global stylesheet
   System-font, mobile-first, WCAG-AA, no external requests
   ============================================================= */

:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #eef3fa;
  --ink: #14213d;
  --ink-soft: #45526b;
  --ink-muted: #6b7690;
  --brand: #1560e0;
  --brand-dark: #0f47a8;
  --brand-tint: #e7f0ff;
  --accent: #0aa06e;
  --accent-tint: #e3f7ef;
  --warn: #b5480c;
  --line: #dbe3f0;
  --line-strong: #c3cfe2;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 30px rgba(20, 33, 61, .08);
  --shadow-sm: 0 3px 12px rgba(20, 33, 61, .06);
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { line-height: 1.25; color: var(--ink); font-weight: 700; }
h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); margin: 0 0 .5em; letter-spacing: -.02em; }
h2 { font-size: clamp(1.35rem, 3vw, 1.85rem); margin: 1.8em 0 .6em; letter-spacing: -.01em; }
h3 { font-size: 1.2rem; margin: 1.4em 0 .4em; }

p { margin: 0 0 1em; color: var(--ink-soft); }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--brand); color: #fff;
  padding: 10px 16px; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 18px;
  min-height: 66px; flex-wrap: wrap;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800;
  color: var(--ink); letter-spacing: -.02em; font-size: 1.06rem; }
.logo:hover { text-decoration: none; }
.logo svg { flex: 0 0 auto; }
.logo .wordmark small { display: block; font-weight: 600; font-size: .68rem;
  color: var(--ink-muted); letter-spacing: .02em; }

.main-nav { margin-left: auto; }
.main-nav ul { list-style: none; display: flex; gap: 6px; margin: 0; padding: 0; flex-wrap: wrap; }
.main-nav a { color: var(--ink-soft); padding: 8px 12px; border-radius: 8px; font-size: .95rem; font-weight: 600; }
.main-nav a:hover { background: var(--surface-2); text-decoration: none; }

.lang-switch { position: relative; }
.lang-switch summary {
  list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px; border: 1px solid var(--line-strong); border-radius: 8px;
  font-size: .92rem; font-weight: 600; color: var(--ink-soft); background: var(--surface);
}
.lang-switch summary::-webkit-details-marker { display: none; }
.lang-switch[open] summary { border-color: var(--brand); }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 6px); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow);
  min-width: 180px; padding: 6px; z-index: 120;
}
.lang-menu a { display: flex; gap: 10px; padding: 9px 12px; border-radius: 7px; color: var(--ink-soft); font-size: .95rem; }
.lang-menu a:hover { background: var(--surface-2); text-decoration: none; }
.lang-menu a[aria-current="true"] { color: var(--brand); font-weight: 700; }

/* ---------- Hero ---------- */
.hero { padding: 40px 0 8px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; align-items: center; }
.hero p.lead { font-size: 1.12rem; color: var(--ink-soft); max-width: 46ch; }
.hero-art { width: 100%; height: auto; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }
.badge {
  display: inline-flex; align-items: center; gap: 6px; background: var(--accent-tint);
  color: #0a7a54; border-radius: 999px; padding: 6px 13px; font-size: .85rem; font-weight: 700;
}

.updated { font-size: .84rem; color: var(--ink-muted); margin: 16px 0 0; }

/* ---------- Layout blocks ---------- */
main { display: block; }
.section { padding: 26px 0; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); padding: 22px;
}

/* ---------- Calculator ---------- */
.calc-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.calc-form .field { margin-bottom: 15px; }
.calc-form label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 5px; color: var(--ink); }
.calc-form .hint { font-weight: 400; color: var(--ink-muted); font-size: .82rem; }
.calc-form input[type="number"],
.calc-form select {
  width: 100%; padding: 11px 12px; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--line-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--ink);
}
.calc-form input:focus, .calc-form select:focus, .seg button:focus-visible {
  outline: 3px solid var(--brand-tint); outline-offset: 1px; border-color: var(--brand);
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.seg { display: inline-flex; background: var(--surface-2); border-radius: 10px; padding: 4px; gap: 4px; }
.seg button {
  border: 0; background: transparent; padding: 8px 16px; border-radius: 7px; cursor: pointer;
  font: inherit; font-weight: 600; font-size: .9rem; color: var(--ink-soft);
}
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--brand); box-shadow: var(--shadow-sm); }

.check { display: flex; align-items: flex-start; gap: 10px; padding: 6px 0; }
.check input[type="checkbox"] { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--brand); }
.check label { margin: 0; font-weight: 500; }

/* ---------- Result ---------- */
.result-card { position: sticky; top: 84px; }
.net-highlight {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff; border-radius: var(--radius); padding: 20px 22px; margin-bottom: 18px;
}
.net-highlight .label { font-size: .9rem; opacity: .9; margin: 0; color: #dbe8ff; }
.net-highlight .amount { font-size: 2.3rem; font-weight: 800; letter-spacing: -.02em; line-height: 1.1; }
.net-highlight .sub { font-size: .9rem; opacity: .92; margin: 4px 0 0; color: #dbe8ff; }

table.breakdown { width: 100%; border-collapse: collapse; font-size: .95rem; }
table.breakdown th, table.breakdown td { padding: 9px 6px; text-align: right; border-bottom: 1px solid var(--line); }
table.breakdown th { text-align: left; font-weight: 600; color: var(--ink-soft); }
table.breakdown thead th { color: var(--ink-muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
table.breakdown tr.sum td, table.breakdown tr.sum th { font-weight: 700; border-top: 2px solid var(--line-strong); border-bottom: none; }
table.breakdown tr.net-row td, table.breakdown tr.net-row th {
  font-weight: 800; color: var(--accent); font-size: 1.05rem; border-top: 2px solid var(--line-strong);
}
.num { font-variant-numeric: tabular-nums; white-space: nowrap; }

.viz { margin-top: 18px; }
.viz svg { width: 100%; height: auto; }
.viz-legend { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 12px; font-size: .84rem; }
.viz-legend span { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-soft); }
.viz-legend i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

.share-row { display: flex; align-items: center; gap: 10px; margin: 0 0 16px; }
.share-btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--brand);
  font: inherit; font-weight: 700; font-size: .9rem; padding: 9px 16px; border-radius: 999px;
}
.share-btn:hover { background: var(--brand-tint); border-color: var(--brand); }
.share-btn:focus-visible { outline: 3px solid var(--brand-tint); outline-offset: 1px; border-color: var(--brand); }
.share-btn svg { flex: 0 0 auto; }

.sources {
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 16px 20px; margin-top: 22px;
}
.sources ul { margin: 8px 0 0; }
.sources li { margin-bottom: 6px; }

.disclaimer {
  background: #fff8ef; border: 1px solid #f0dcc0; color: var(--warn);
  border-radius: var(--radius-sm); padding: 12px 15px; font-size: .85rem; margin-top: 16px;
}
.disclaimer strong { color: #8a3708; }

/* ---------- Content / FAQ ---------- */
.prose { max-width: 74ch; }
.prose h2 { border-top: 1px solid var(--line); padding-top: 1.2em; }
.prose ul, .prose ol { color: var(--ink-soft); padding-left: 1.3em; }
.prose li { margin-bottom: .4em; }
.prose table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .93rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 9px 11px; text-align: left; }
.prose thead th { background: var(--surface-2); }

.faq details {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm);
  margin-bottom: 10px; padding: 2px 18px;
}
.faq summary { cursor: pointer; font-weight: 700; padding: 14px 0; list-style: none; color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--brand); font-weight: 700; font-size: 1.3rem; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details[open] { box-shadow: var(--shadow-sm); }
.faq details p { padding-bottom: 6px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: #c3cfe2; margin-top: 40px; padding: 40px 0 28px; }
.site-footer a { color: #dce6f7; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 28px; }
.site-footer h4 { color: #fff; font-size: .95rem; margin: 0 0 12px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; font-size: .92rem; }
.footer-bottom { border-top: 1px solid #26324c; margin-top: 26px; padding-top: 18px; font-size: .82rem; color: #8f9cb5; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art-wrap { order: -1; max-width: 420px; }
  .calc-wrap { grid-template-columns: 1fr; }
  .result-card { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .header-inner { min-height: 58px; }
  .main-nav { order: 3; width: 100%; margin: 0 0 8px; }
  .main-nav ul { justify-content: center; }
  .lang-switch { margin-left: auto; }
  .field-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .net-highlight .amount { font-size: 2rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}