/* ============================================================================
   Bauhaus: Primärfarben, strenge Raster, rechte Winkel, keine Ornamente.
   Kein CSS-Framework, keine externen Ressourcen — der Container läuft offline.
   ========================================================================== */

@font-face { font-family: 'Josefin Sans'; font-style: normal; font-weight: 400;
  font-display: swap; src: url('../fonts/josefin-sans-400.woff2') format('woff2'); }
@font-face { font-family: 'Josefin Sans'; font-style: normal; font-weight: 600;
  font-display: swap; src: url('../fonts/josefin-sans-600.woff2') format('woff2'); }
@font-face { font-family: 'Josefin Sans'; font-style: normal; font-weight: 700;
  font-display: swap; src: url('../fonts/josefin-sans-700.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400;
  font-display: swap; src: url('../fonts/jetbrains-mono-400.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 700;
  font-display: swap; src: url('../fonts/jetbrains-mono-700.woff2') format('woff2'); }

:root {
  --rot: #E63946;
  --blau: #1D3557;
  --blau-hell: #3178C6;
  --gelb: #F4D35E;
  --ocker: #B8860B;
  --tinte: #1D1D1B;
  --gedaempft: #6B6B68;
  --linie: #D6D6D2;
  --flaeche: #F5F0E1;
  --weiss: #FCFCFB;
  --serif: 'Josefin Sans', 'Segoe UI', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --spalte: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--weiss); color: var(--tinte);
  font-family: var(--serif); font-size: 17px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-weight: 700; line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 0.6em; }
h1 { font-size: clamp(2.4rem, 5vw, 4rem); text-transform: uppercase; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); text-transform: uppercase; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; max-width: 72ch; }
a { color: var(--rot); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--blau); }
strong { font-weight: 700; }
hr { border: 0; border-top: 2px solid var(--tinte); margin: 4rem 0; }

.huelle { max-width: var(--spalte); margin: 0 auto; padding: 0 1.5rem; }
section { padding: clamp(3rem, 7vw, 6rem) 0; border-top: 2px solid var(--tinte); }
section:first-of-type { border-top: 0; }
.marke { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--gedaempft); display: block; margin-bottom: 0.8rem; }

/* --- Kopf ---------------------------------------------------------------- */
.kopf { border-bottom: 2px solid var(--tinte); background: var(--weiss); }
.kopf .huelle { display: grid; grid-template-columns: 1.35fr 1fr; gap: 3rem; align-items: center;
  padding-top: 3.5rem; padding-bottom: 3.5rem; }
.kopf p.lead { font-size: 1.15rem; max-width: 54ch; }
.geometrie { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; aspect-ratio: 3 / 2; }
.geometrie div { border: 2px solid var(--tinte); margin: -1px; }
.g-kreis { background: var(--rot); border-radius: 50% !important; }
.g-quadrat { background: var(--blau); }
.g-dreieck { background: var(--gelb); clip-path: polygon(50% 0, 100% 100%, 0 100%); border: 0 !important; }
.g-leer { background: transparent; }

nav.navi { border-bottom: 2px solid var(--tinte); position: sticky; top: 0; z-index: 100;
  background: var(--weiss); }
nav.navi .huelle { display: flex; gap: 1.5rem; flex-wrap: wrap; padding-top: 0.7rem; padding-bottom: 0.7rem; }
nav.navi a { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.1em; text-transform: uppercase;
  text-decoration: none; color: var(--tinte); }
nav.navi a:hover { color: var(--rot); }

/* --- Rechner ------------------------------------------------------------- */
.rechner { display: grid; grid-template-columns: 340px 1fr; gap: 2.5rem; align-items: start; }
.eingaben { border: 2px solid var(--tinte); background: var(--weiss); position: sticky; top: 56px; }
.feldgruppe { border-bottom: 2px solid var(--tinte); }
.feldgruppe:last-child { border-bottom: 0; }
.feldgruppe h3 { margin: 0; padding: 0.7rem 1rem; font-size: 0.82rem; font-family: var(--mono);
  letter-spacing: 0.1em; text-transform: uppercase; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center; background: var(--flaeche); }
.feldgruppe h3::after { content: '–'; font-family: var(--mono); }
.feldgruppe.zu h3::after { content: '+'; }
.feldgruppe.zu .felder { display: none; }
.felder { padding: 1rem; display: grid; gap: 0.85rem; }
label { display: block; font-size: 0.83rem; color: var(--gedaempft); margin-bottom: 0.2rem; }
input[type=number], input[type=text], select {
  width: 100%; padding: 0.5rem 0.6rem; border: 1.5px solid var(--linie); border-radius: 0;
  font-family: var(--mono); font-size: 0.95rem; background: var(--weiss); color: var(--tinte);
}
input:focus, select:focus { outline: 2px solid var(--rot); outline-offset: 2px; border-color: var(--tinte); }
.zeile2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; }
.schalter { display: flex; align-items: flex-start; gap: 0.6rem; font-size: 0.86rem; color: var(--tinte); }
.schalter input { margin-top: 0.25rem; accent-color: var(--rot); }
.hinweis { font-size: 0.78rem; color: var(--gedaempft); line-height: 1.45; }

/* --- Ergebnisse ---------------------------------------------------------- */
.kacheln { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 2px solid var(--tinte); }
.kachel { padding: 1.1rem 1.2rem; border-right: 2px solid var(--tinte); border-bottom: 2px solid var(--tinte); }
.kachel:nth-child(4n) { border-right: 0; }
.kachel:nth-child(n+5) { border-bottom: 0; }
.kachel .titel { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--gedaempft); }
.kachel .zahl { font-size: 1.7rem; font-weight: 700; line-height: 1.2; margin: 0.2rem 0; font-variant-numeric: tabular-nums; }
.kachel .zusatz { font-size: 0.78rem; color: var(--gedaempft); line-height: 1.4; }
.kachel.betont { background: var(--gelb); }

.bewertung { border-left: 8px solid var(--rot); background: var(--flaeche); padding: 1.2rem 1.4rem;
  margin: 1.5rem 0; font-size: 1.02rem; }
.bewertung.gut { border-left-color: var(--blau-hell); }
.bewertung.mittel { border-left-color: var(--ocker); }
.bewertung.schlecht { border-left-color: var(--rot); }
.bewertung p { margin: 0; max-width: none; }

/* --- Diagramme ----------------------------------------------------------- */
.diagramm { border: 2px solid var(--tinte); padding: 1.1rem 1.2rem 0.6rem; margin: 1.5rem 0; background: var(--weiss); }
.diagramm > h3 { font-size: 1rem; margin-bottom: 0.15rem; }
.diagramm > .hinweis { margin-bottom: 0.8rem; }
.diagramm-paar { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.diagramm-paar .diagramm { margin: 0; }
svg text.achse { font-family: var(--mono); font-size: 10px; fill: var(--gedaempft); }
svg text.legende { font-family: var(--mono); font-size: 10px; fill: var(--tinte); }
svg text.wert { font-family: var(--mono); font-size: 10px; fill: var(--tinte); font-weight: 700; }
.legende-zeile { display: flex; gap: 1.4rem; flex-wrap: wrap; font-size: 0.78rem;
  color: var(--gedaempft); margin-top: 0.4rem; }
.legende-zeile span { display: flex; align-items: center; gap: 0.4rem; }
.legende-zeile i { width: 14px; height: 14px; display: inline-block; }

/* --- Tabellen ------------------------------------------------------------ */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 1.2rem 0; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--linie); vertical-align: top; }
th { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
  border-bottom: 2px solid var(--tinte); color: var(--tinte); }
td:not(:first-child) { font-family: var(--mono); font-variant-numeric: tabular-nums; }
tr.summe td { border-top: 2px solid var(--tinte); border-bottom: 2px solid var(--tinte); font-weight: 700; }
table.rechenweg td:last-child { text-align: right; white-space: nowrap; }
.guete { font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; padding: 0.1rem 0.4rem;
  border: 1.5px solid var(--tinte); }
.g-hoch { background: var(--gelb); }
.g-mittel { background: var(--flaeche); }
.g-niedrig, .g-modell { background: transparent; color: var(--gedaempft); border-color: var(--linie); }

/* --- Fließtextabschnitte ------------------------------------------------- */
.zickzack { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; margin: 2.5rem 0; }
.zickzack.gedreht > div:first-child { order: 2; }
.formel { font-family: var(--mono); font-size: 0.86rem; background: var(--flaeche); padding: 1rem 1.2rem;
  border-left: 8px solid var(--blau); overflow-x: auto; line-height: 1.7; white-space: pre-wrap; }
.merksatz { border: 2px solid var(--tinte); border-left: 12px solid var(--gelb); padding: 1.1rem 1.3rem;
  margin: 1.8rem 0; font-size: 1.05rem; }
.warnung { border: 2px solid var(--rot); padding: 1.1rem 1.3rem; margin: 1.8rem 0; }
.warnung h3 { color: var(--rot); }
ol.schritte { counter-reset: s; list-style: none; padding: 0; }
ol.schritte li { counter-increment: s; position: relative; padding-left: 3rem; margin-bottom: 1.2rem; max-width: 72ch; }
ol.schritte li::before { content: counter(s); position: absolute; left: 0; top: 0;
  width: 2rem; height: 2rem; background: var(--tinte); color: var(--weiss);
  display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-size: 0.85rem; }

footer { border-top: 2px solid var(--tinte); padding: 2.5rem 0 3.5rem; font-size: 0.85rem; color: var(--gedaempft); }
footer a { color: var(--gedaempft); }

/* Ankersprünge dürfen nicht unter der klebenden Navigation verschwinden. */
section, .diagramm, h2, h3 { scroll-margin-top: 64px; }

@media (max-width: 700px) {
  nav.navi .huelle { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch;
    scrollbar-width: none; }
  nav.navi .huelle::-webkit-scrollbar { display: none; }
  nav.navi a { white-space: nowrap; }
  section, .diagramm, h2, h3 { scroll-margin-top: 48px; }
}

@media (max-width: 1000px) {
  .rechner { grid-template-columns: 1fr; }
  .eingaben { position: static; }
  .kacheln { grid-template-columns: repeat(2, 1fr); }
  .kachel:nth-child(4n) { border-right: 2px solid var(--tinte); }
  .kachel:nth-child(2n) { border-right: 0; }
  .kachel:nth-child(n+5) { border-bottom: 2px solid var(--tinte); }
  .kachel:nth-child(n+7) { border-bottom: 0; }
  .kopf .huelle, .zickzack, .diagramm-paar { grid-template-columns: 1fr; }
  .zickzack.gedreht > div:first-child { order: 0; }
  .geometrie { max-width: 320px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .kacheln { grid-template-columns: 1fr; }
  .kachel { border-right: 0 !important; border-bottom: 2px solid var(--tinte) !important; }
  .kachel:last-child { border-bottom: 0 !important; }
}
@media print {
  nav.navi, .eingaben { display: none; }
  .rechner { grid-template-columns: 1fr; }
}

/* --- Erklärkasten: die Rechnung in einfachen Worten ---------------------- */
.erklaerkasten { border: 2px solid var(--tinte); border-top-width: 12px; border-top-color: var(--blau);
  padding: 1.3rem 1.5rem 0.6rem; margin: 1.8rem 0; background: var(--weiss); }
.erklaerkasten h3 { font-size: 1.15rem; margin-bottom: 0.7rem; }
.erklaerkasten table { margin-top: 0.8rem; }
.erklaerkasten p { max-width: none; }

/* --- Hinweise, Datentabellen, Permalink ---------------------------------- */
.eingabehinweis { font-family: var(--mono); font-size: 0.8rem; background: var(--gelb);
  border: 2px solid var(--tinte); padding: 0.5rem 0.8rem; margin: 0 0 1rem; }
details.datentabelle { margin-top: 0.8rem; border-top: 1px solid var(--linie); padding-top: 0.5rem; }
details.datentabelle summary { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--gedaempft); cursor: pointer; }
details.datentabelle table { font-size: 0.8rem; }
details.datentabelle td, details.datentabelle th { padding: 0.3rem 0.5rem; }
.permalink { font-size: 0.82rem; color: var(--gedaempft); border-left: 4px solid var(--linie);
  padding-left: 0.9rem; }