:root {
  --bg: #eef1f4; --panel: #f8fafb; --ink: #1b2430; --muted: #5e6978; --line: #d3d9e0; --card: #ffffff;
  --pos: #3a5bd9; --neg: #d9792b; --pos3: #5c7dff; --neg3: #ff9a3d; --axis: rgba(27, 36, 48, .28);
  --sel: #1b2430; --selink: #f8fafb; --link: #2a46b8;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --maxw: 860px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11151b; --panel: #181d25; --ink: #e4e8ee; --muted: #97a1ae; --line: #2b323d; --card: #161b22;
    --pos: #8aa2ff; --neg: #f2a65a; --pos3: #b3c3ff; --neg3: #ffc27f; --axis: rgba(228, 232, 238, .25);
    --sel: #e4e8ee; --selink: #11151b; --link: #9db1ff;
  }
}
:root[data-theme="dark"] {
  --bg: #11151b; --panel: #181d25; --ink: #e4e8ee; --muted: #97a1ae; --line: #2b323d; --card: #161b22;
  --pos: #8aa2ff; --neg: #f2a65a; --pos3: #b3c3ff; --neg3: #ffc27f; --axis: rgba(228, 232, 238, .25);
  --sel: #e4e8ee; --selink: #11151b; --link: #9db1ff;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 16px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 17px; line-height: 1.6; }
a { color: var(--link); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--pos); outline-offset: 2px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--sel); color: var(--selink); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }

/* Kopf und Fuß */
.site-header { max-width: var(--maxw); margin: 0 auto; padding: 14px 16px 6px; display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; justify-content: space-between; }
.brand { font-weight: 650; letter-spacing: -.01em; color: var(--ink); text-decoration: none; font-size: 18px; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 15px; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--pos); }
.lang { display: flex; gap: 2px; font-size: 14px; }
.lang a, .lang span { padding: 3px 9px; border: 1px solid var(--line); border-radius: 6px; text-decoration: none; color: var(--muted); }
.lang [aria-current="true"] { background: var(--sel); color: var(--selink); border-color: var(--sel); }
.site-footer { max-width: var(--maxw); margin: 40px auto 0; padding: 22px 16px 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; display: grid; gap: 10px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.site-footer a { color: var(--muted); }

main { max-width: var(--maxw); margin: 0 auto; padding: 8px 16px 0; }
.hero { padding: 18px 0 14px; }
.eyebrow { margin: 0 0 4px; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
h1 { font-size: clamp(28px, 4.6vw, 44px); font-weight: 600; letter-spacing: -.02em; line-height: 1.1; margin: 0 0 10px; }
.lead { color: var(--muted); font-size: 19px; line-height: 1.5; margin: 0; max-width: 62ch; }
h2 { font-size: 26px; letter-spacing: -.01em; line-height: 1.2; margin: 38px 0 10px; font-weight: 600; }
h3 { font-size: 20px; line-height: 1.3; margin: 0 0 8px; font-weight: 600; }
h3 sub, .chips sub { font-size: .65em; }

/* Labor: Bild, Steuerung, Beschreibung */
.lab { display: grid; gap: 12px; }
.stage { position: relative; margin: 0 auto; width: 100%; max-width: 820px; }
canvas { display: block; width: 100%; aspect-ratio: 1; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; touch-action: pan-y; }
canvas.drag { touch-action: none; cursor: grab; }
canvas.drag:active { cursor: grabbing; }
.legend { position: absolute; left: 12px; top: 10px; display: flex; gap: 14px; font-size: 13px; color: var(--muted); pointer-events: none; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }
.dot--pos { background: var(--pos); } .dot--neg { background: var(--neg); }
.empty { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: 0 12%; font-size: 15px; color: var(--muted); pointer-events: none; }
.empty[hidden] { display: none; }
.hint { position: absolute; left: 12px; right: 12px; bottom: 10px; margin: 0; padding: 6px 10px; font-size: 13px; color: var(--ink); background: color-mix(in srgb, var(--panel) 88%, transparent); border: 1px solid var(--line); border-radius: 8px; }
.hint[hidden] { display: none; }
.hint-hand { position: absolute; right: 12px; top: 10px; font-size: 12px; color: var(--muted); pointer-events: none; }

.controls { margin: 0 auto; width: 100%; max-width: 820px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 10px 14px; display: grid; gap: 6px; }
.controls > div { display: grid; gap: 6px; }
.controls > div + div:not(:empty) { border-top: 1px solid var(--line); padding-top: 8px; }
.ctl-row { display: grid; grid-template-columns: minmax(7.5em, 11em) 1fr; gap: 4px 12px; align-items: center; }
.ctl-lbl { font-size: 13px; color: var(--muted); line-height: 1.25; }
.chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chips:empty { display: none; }
button { font: inherit; font-size: 14px; color: var(--ink); background: transparent; border: 1px solid var(--line); border-radius: 7px; padding: 3px 10px; min-height: 32px; cursor: pointer; line-height: 1.2; }
button:hover { border-color: var(--muted); }
button[aria-pressed="true"] { background: var(--sel); color: var(--selink); border-color: var(--sel); }
.slider { display: flex; align-items: center; gap: 12px; }
.slider input { flex: 1; min-width: 0; accent-color: var(--pos); }
.slider output { font-variant-numeric: tabular-nums; font-size: 14px; min-width: 5.5em; text-align: right; }
@media (max-width: 620px) { .ctl-row { grid-template-columns: 1fr; } }

.desc { margin: 0 auto; width: 100%; max-width: 820px; min-height: 160px; padding: 0 2px; }
.desc p { margin: 0 0 10px; max-width: 68ch; }
.facts { list-style: none; margin: 0 0 12px; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 8px; }
.facts li { font-size: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px; }
.facts b { font-weight: 600; color: var(--muted); margin-right: 4px; }
.chart-fig { margin: 16px 0 0; max-width: 480px; }
.chart-fig figcaption { font-size: 13px; color: var(--muted); }
.chart, .mo-diagram { width: 100%; height: auto; display: block; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
.mo-diagram { max-width: 340px; margin-top: 8px; }

/* Fließtext */
.prose { margin: 28px 0 0; max-width: 68ch; }
.prose p, .prose ul, .prose ol { margin: 0 0 14px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin-bottom: 4px; }
.prose figure { margin: 18px 0; }
.prose dt { font-weight: 600; margin-top: 10px; }
.prose dd { margin: 2px 0 0 0; }
.callout { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--pos); border-radius: 8px; padding: 10px 14px; margin: 16px 0; }
.callout p:last-child { margin-bottom: 0; }
.pager { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin: 36px 0 0; max-width: 68ch; }
.pager a { display: block; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); text-decoration: none; color: var(--ink); min-width: 12em; }
.pager small { display: block; color: var(--muted); font-size: 12px; }
.pager .next { text-align: right; margin-left: auto; }

/* Startseite */
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 18px 0 0; padding: 0; list-style: none; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.card h2 { font-size: 20px; margin: 4px 0 6px; }
.card a { color: var(--ink); text-decoration: none; }
.card a:hover { text-decoration: underline; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .num { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.placeholder { background: color-mix(in srgb, var(--neg) 25%, transparent); border-radius: 4px; padding: 0 3px; }
noscript .callout { margin: 16px 0; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

/* Brotkrumen, Dialog, Denkfragen */
.crumbs ol { list-style: none; margin: 0 0 8px; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 8px; font-size: 13px; color: var(--muted); }
.crumbs li + li::before { content: "›"; margin-right: 8px; opacity: .6; }
.crumbs a { color: var(--muted); }
.btn { display: inline-block; padding: 8px 16px; border: 1px solid var(--sel); border-radius: 8px; background: var(--sel); color: var(--selink); text-decoration: none; font-size: 15px; }
.btn:hover { opacity: .88; }
.dialog { margin: 34px 0 6px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.dialog h2 { margin: 0 0 6px; font-size: 20px; }
.dialog p { margin: 0 0 12px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; margin: 0 0 10px; }
summary { cursor: pointer; font-weight: 600; }
details[open] summary { margin-bottom: 6px; }
details p { margin: 0 0 8px; }
.card h3 { font-size: 20px; margin: 4px 0 6px; }
.card .num:empty { display: none; }

.ask { margin: 10px 0 0; font-size: 14px; }
.ask a { color: var(--muted); }

/* Aufklappmenü */
.site-nav { align-items: center; }
.menu-item { position: relative; display: flex; align-items: center; gap: 2px; }
.menu-toggle { min-height: 28px; padding: 0 6px; border: 0; background: transparent; color: var(--muted); font-size: 13px; }
.menu-toggle:hover { color: var(--ink); border: 0; }
.submenu { position: absolute; top: 100%; left: 0; z-index: 20; margin: 0; padding: 6px; list-style: none; min-width: 14em; background: var(--card); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 8px 24px rgba(0, 0, 0, .25);
  visibility: hidden; opacity: 0; transform: translateY(2px); transition: opacity .12s ease, transform .12s ease, visibility 0s linear .35s; }
.submenu::before { content: ""; position: absolute; left: 0; right: 0; top: -12px; height: 12px; }
.menu-item.open .submenu { visibility: visible; opacity: 1; transform: none; transition-delay: 0s; }
@media (hover: hover) { .menu-item:hover .submenu, .menu-item:focus-within .submenu { visibility: visible; opacity: 1; transform: none; transition-delay: 0s; } }
.submenu li { margin: 0; }
.submenu a { display: block; padding: 7px 10px; border: 0; border-radius: 6px; color: var(--ink); white-space: nowrap; }
.submenu a:hover, .submenu a[aria-current="page"] { background: color-mix(in srgb, var(--pos) 18%, transparent); }