/* Werkzeuge – gemeinsames Stylesheet.
   Layout: eine schmale Werkbank-Spalte, Kopf mit Seitenname, Fuß mit Pflichtseiten. */
:root {
  --bg: #f3f5f7;
  --surface: #ffffff;
  --fg: #1b2330;
  --muted: #5d6878;
  --line: #d5dbe3;
  --accent: #1f4fd1;        /* Anreißfarbe-Blau */
  --accent-soft: #e3eafc;
  --on-accent: #ffffff;
  --error: #b42318;
  --f-display: "Barlow Semi Condensed", "Arial Narrow", sans-serif;
  --f-body: "Barlow", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "DejaVu Sans Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151b; --surface: #1a2029; --fg: #e6eaf0; --muted: #9aa5b4;
    --line: #2d3644; --accent: #7fa2ff; --accent-soft: #1d2a4a; --on-accent: #11151b;
    --error: #ff8a80;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.5;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 24px 40px;
}
main, .site-head, .site-foot { max-width: 760px; margin: 0 auto; }
main { display: grid; gap: 28px; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, tr:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

.site-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 28px; }
.site-name {
  font: 700 1rem var(--f-display); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); text-decoration: none;
}
.site-foot {
  margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 0.9rem; color: var(--muted);
}
.site-foot a { color: var(--muted); }

header.page { display: grid; gap: 4px; }
h1 {
  font-family: var(--f-display); font-weight: 700; font-size: 2.2rem;
  line-height: 1.1; margin: 0; text-wrap: balance; letter-spacing: 0.01em;
}
h2 { font-family: var(--f-display); font-weight: 700; font-size: 1.25rem; margin: 0 0 10px; text-wrap: balance; }
.sub { margin: 0; color: var(--muted); max-width: 62ch; }
.prose { max-width: 65ch; }
.prose p, .prose ul { margin: 0 0 12px; }
.formula { font-family: var(--f-mono); color: var(--fg); white-space: nowrap; }

/* Startseite: Werkzeugliste */
.tools { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.tools a {
  display: grid; gap: 2px; padding: 16px 18px; text-decoration: none; color: var(--fg);
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
}
.tools a:hover { border-color: var(--accent); }
.tools .name { font: 700 1.2rem var(--f-display); color: var(--accent); }
.tools .what { color: var(--muted); }

/* Radius-Rechner */
.bench {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 260px); gap: 24px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 24px;
}
@media (max-width: 620px) { .bench { grid-template-columns: minmax(0, 1fr); padding: 18px; } }

.calc { display: grid; gap: 18px; align-content: start; min-width: 0; }
.mode { display: flex; flex-wrap: wrap; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; width: fit-content; max-width: 100%; }
.mode button {
  font: 500 0.9rem var(--f-body); padding: 7px 14px; border: 0; background: transparent;
  color: var(--muted); cursor: pointer;
}
.mode button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); }

.lbl { display: block; font-family: var(--f-display); font-weight: 500; font-size: 0.8rem;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.field { display: flex; align-items: baseline; gap: 8px; border-bottom: 2px solid var(--fg); max-width: 280px; }
.field input {
  font: 600 2.4rem var(--f-mono); width: 100%; min-width: 0; border: 0; background: transparent;
  color: var(--fg); padding: 2px 0; font-variant-numeric: tabular-nums;
}
.field input:focus-visible { outline: none; }
.field:focus-within { border-color: var(--accent); }
.unit { font: 400 1.1rem var(--f-mono); color: var(--muted); }
.err { color: var(--error); font-size: 0.9rem; min-height: 1.4em; margin: 4px 0 0; }

.result { display: grid; gap: 2px; }
.result .value {
  font: 600 3.4rem/1.05 var(--f-mono); color: var(--accent); font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.result .value small { font-size: 1.2rem; font-weight: 400; color: var(--muted); }
.result .calcline { font: 400 0.9rem var(--f-mono); color: var(--muted); overflow-wrap: anywhere; }
.result .diam { font: 600 1.3rem var(--f-mono); color: var(--fg); margin-top: 8px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }

figure { margin: 0; display: grid; gap: 8px; align-content: start; min-width: 0; }
figure svg { width: 100%; max-width: 260px; height: auto; display: block; }
figcaption { font-size: 0.85rem; color: var(--muted); }
.svg-line { stroke: var(--fg); }
.svg-muted { stroke: var(--muted); }
.svg-accent { stroke: var(--accent); }
.svg-fill-muted { fill: var(--muted); }
.svg-fill-accent { fill: var(--accent); }

.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; font-family: var(--f-mono); font-variant-numeric: tabular-nums; width: 100%; max-width: 420px; }
th, td { text-align: right; padding: 5px 14px; border-bottom: 1px solid var(--line); }
th { font: 500 0.75rem var(--f-display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
tbody tr { cursor: pointer; }
tbody tr:hover td { background: var(--accent-soft); }
tr.near td { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.note { font-size: 0.85rem; color: var(--muted); margin: 10px 0 0; max-width: 62ch; }

.downloads { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.downloads a { font-weight: 500; }
.downloads span { color: var(--muted); font-size: 0.9rem; }