/* Sand, der rechnet — Gelblicht und Mikroskopnacht */
:root {
  --gelb: #F0B429;
  --gelb-hell: #F7CB5A;
  --gelb-tief: #D99A12;
  --tinte: #1F1606;
  --tinte-2: rgba(31, 22, 6, .74);
  --tinte-3: rgba(31, 22, 6, .5);
  --linie: rgba(31, 22, 6, .22);
  --nacht: #0E1222;
  --nacht-2: #161B30;
  --nacht-3: #232A45;
  --licht: #E3E7F1;
  --licht-2: #9AA3BA;
  --si: #A9BBDA;
  --glut: #FF5B1F;
  --kupfer: #E0915A;
  --elek: #3D7BFF;
  --loch: #E0457B;
  --iris: linear-gradient(95deg, #4C6FFF 0%, #9A5BFF 24%, #E0569B 46%, #F2B429 68%, #3CC6A5 100%);
  --serif: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;
  --sans: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --rand: clamp(16px, 7vw, 120px);
  --lineal: 64px;
  color-scheme: dark light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--nacht);
  color: var(--licht);
  font: 500 17px/1.6 var(--sans);
  font-variant-numeric: tabular-nums;
  overflow-x: hidden;
}
sub, sup { font-size: .68em; line-height: 0; }
canvas { display: block; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--elek); outline-offset: 3px; border-radius: 2px; }
.kapitel--gelb :focus-visible, .akt--gelb :focus-visible, .hero :focus-visible { outline-color: var(--tinte); }

.skip { position: absolute; left: -9999px; top: 8px; z-index: 50; background: var(--tinte); color: var(--gelb); padding: 8px 14px; }
.skip:focus { left: 8px; }

/* ── Maßlineal ───────────────────────────── */
.lineal {
  position: fixed; top: 0; right: 0; bottom: 0; width: var(--lineal);
  z-index: 20; pointer-events: none;
  color: var(--licht-2);
  mix-blend-mode: normal;
  transition: color .5s;
}
.lineal[data-licht="gelb"] { color: var(--tinte-2); }
.lineal__skala { position: absolute; top: 6vh; bottom: 6vh; right: 0; width: 100%; }
.lineal__strich { position: absolute; right: 0; height: 1px; background: currentColor; opacity: .5; }
.lineal__strich--gross { width: 22px; opacity: .9; }
.lineal__strich--klein { width: 9px; }
.lineal__ziffer { position: absolute; right: 26px; transform: translateY(-50%); font-size: 11px; line-height: 1; white-space: nowrap; opacity: .85; }
.lineal__marke {
  position: absolute; right: 0; top: 50%; height: 0;
  transition: top .6s cubic-bezier(.2,.8,.2,1);
}
.lineal__marke::before {
  content: ""; position: absolute; right: 0; top: -1px; width: var(--lineal); height: 2px;
  background: var(--iris);
}
.lineal__marke span {
  position: absolute; right: calc(var(--lineal) + 6px); top: 0; transform: translateY(-50%);
  font-size: 13px; font-weight: 600; white-space: nowrap;
  padding: 3px 8px; border-radius: 3px;
  background: var(--licht); color: var(--nacht);
}
.lineal[data-licht="gelb"] .lineal__marke span { background: var(--tinte); color: var(--gelb); }
@media (max-width: 820px) {
  :root { --lineal: 0px; }
  .lineal { display: none; }
}

/* ── Hero ───────────────────────────────── */
.hero {
  position: relative; min-height: 100svh; overflow: hidden;
  background: var(--gelb); color: var(--tinte);
  display: grid; grid-template-rows: 1fr auto;
  padding: 0 calc(var(--rand) + var(--lineal)) 0 var(--rand);
}
.hero__sand { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero__text { position: relative; align-self: center; padding: 14vh 0 4vh; pointer-events: none; max-width: 1100px; }
.hero__formel { margin: 0 0 2vh; font: 400 clamp(18px, 2vw, 26px)/1 var(--serif); font-style: italic; color: var(--tinte-2); }
.hero__titel {
  margin: 0; font: 400 clamp(76px, 15.5vw, 260px)/.84 var(--serif);
  letter-spacing: -.035em; color: var(--tinte);
}
.hero__unter, .hero__hinweis, .hero__akte span { text-shadow: 0 0 10px var(--gelb), 0 0 4px var(--gelb), 0 0 2px var(--gelb); }
.hero__unter { margin: 4vh 0 0; max-width: 34em; font-size: clamp(17px, 1.45vw, 21px); line-height: 1.5; color: var(--tinte); }
.hero__hinweis { margin: 2.2vh 0 0; font-size: 14px; color: var(--tinte-2); }
.hero__akte { position: relative; display: flex; gap: clamp(16px, 4vw, 56px); padding: 0 0 5vh; flex-wrap: wrap; }
.hero__akte a {
  color: var(--tinte); text-decoration: none; display: grid; gap: 2px;
  border-top: 2px solid var(--tinte); padding-top: 10px; min-width: 200px;
}
.hero__akte b { font: 400 34px/1 var(--serif); }
.hero__akte span { font-size: 14px; color: var(--tinte-2); }
.hero__akte a:hover b { text-decoration: underline; text-underline-offset: 5px; text-decoration-thickness: 1px; }

/* ── Akte und Kapitel ───────────────────── */
.akt, .kapitel { position: relative; padding: clamp(80px, 16vh, 180px) calc(var(--rand) + var(--lineal)) clamp(60px, 12vh, 140px) var(--rand); }
.akt--nacht { background: var(--nacht); color: var(--licht); }
.akt--gelb, .kapitel--gelb { background: var(--gelb); color: var(--tinte); }
.kapitel--nacht { background: var(--nacht); color: var(--licht); }
.kapitel--gelb + .kapitel--gelb { padding-top: clamp(40px, 8vh, 90px); border-top: 1px solid var(--linie); }

.akt__kopf { display: grid; grid-template-columns: minmax(0, auto) minmax(0, 36em); gap: 0 clamp(24px, 5vw, 80px); align-items: end; }
.akt__nr { grid-column: 1; margin: 0; font-size: 15px; opacity: .7; }
.akt__titel { grid-column: 1; margin: 0; font: 400 clamp(84px, 13vw, 210px)/.85 var(--serif); letter-spacing: -.03em; }
.akt--nacht .akt__titel { background: var(--iris); -webkit-background-clip: text; background-clip: text; color: transparent; }
.akt__lead { grid-column: 2; grid-row: 1 / span 2; margin: 0 0 .6em; font-size: clamp(17px, 1.35vw, 20px); }
@media (max-width: 900px) {
  .akt__kopf { grid-template-columns: 1fr; }
  .akt__lead { grid-column: 1; grid-row: auto; margin-top: 28px; }
}
.gelblicht-notiz { max-width: 36em; margin: 9vh 0 0; padding-left: 18px; border-left: 3px solid var(--tinte); font-size: 15px; color: var(--tinte-2); }

.kapitel__satz { max-width: 44em; margin-bottom: clamp(32px, 6vh, 64px); }
.kapitel__nr { margin: 0 0 10px; font-size: 15px; color: var(--tinte-2); }
.kapitel__titel { margin: 0 0 22px; font: 400 clamp(44px, 6.2vw, 96px)/.95 var(--serif); letter-spacing: -.02em; max-width: 14em; }
.kapitel__lead { margin: 0; font-size: clamp(17px, 1.3vw, 20px); max-width: 38em; }
.kapitel--nacht .kapitel__lead { color: var(--licht); }
.quelle { font-size: 13px; line-height: 1.5; opacity: .72; margin: 14px 0 0; }
h3 { font: 400 clamp(30px, 3vw, 44px)/1.02 var(--serif); margin: 0 0 14px; letter-spacing: -.01em; }

/* Werte-Paare */
.werte { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 24px; margin: 22px 0 0; }
.werte div { border-top: 1px solid var(--linie); padding-top: 8px; }
.werte dt { font-size: 13px; color: var(--tinte-2); }
.werte dd { margin: 2px 0 0; font: 400 34px/1.05 var(--serif); }
.werte .bit { font-family: var(--sans); font-weight: 700; }

/* Regler */
.regler { display: grid; gap: 8px; margin: 22px 0 0; font-size: 15px; }
.regler span { display: flex; justify-content: space-between; gap: 12px; }
.regler output { font-weight: 700; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 30px; background: transparent; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { height: 3px; background: currentColor; border-radius: 2px; }
input[type=range]::-moz-range-track { height: 3px; background: currentColor; border-radius: 2px; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 22px; height: 22px; margin-top: -9.5px; border-radius: 50%; background: var(--tinte); border: 3px solid var(--gelb); box-shadow: 0 0 0 2px var(--tinte); }
input[type=range]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--tinte); border: 3px solid var(--gelb); box-shadow: 0 0 0 2px var(--tinte); }

/* ── Tauchgang ──────────────────────────── */
.tauchgang { position: relative; background: #05070E; }
.tauchgang__strecke { height: 1000vh; }
.tauchgang__buehne { position: sticky; top: 0; height: 100svh; overflow: hidden; margin-bottom: -100svh; }
.tauchgang__canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.tauchgang__instrument {
  position: absolute; top: 5vh; left: var(--rand); right: calc(var(--rand) + var(--lineal));
  display: flex; justify-content: space-between; align-items: flex-start; gap: 20px;
  color: var(--licht); pointer-events: none;
  text-shadow: 0 1px 12px rgba(0,0,0,.8);
}
.tauchgang__zahl { font: 400 clamp(46px, 7vw, 110px)/.9 var(--serif); letter-spacing: -.02em; text-align: right; min-width: 3em; }
.tauchgang__massstab { display: grid; gap: 6px; font-size: 13px; padding-top: 10px; }
.tauchgang__massstab span { display: block; height: 6px; border: 2px solid var(--licht); border-top: 0; width: 120px; }
.tauchgang__massstab b { font-weight: 600; }
.tauchgang__ebenen { position: absolute; top: 100%; right: 0; margin-top: 14px; display: flex; gap: 5px; }
.tauchgang__ebenen i { display: block; width: 18px; height: 3px; background: rgba(227,231,241,.25); border-radius: 2px; transition: background .3s; }
.tauchgang__ebenen i.an { background: var(--licht); }
.tauchgang__tafel {
  position: absolute; left: var(--rand); bottom: 6vh; width: min(460px, calc(100vw - 2 * var(--rand)));
  padding: 22px 24px 24px; border-radius: 4px;
  background: rgba(10, 13, 26, .78); border: 1px solid rgba(227,231,241,.14);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  color: var(--licht);
}
.tauchgang__ebene { margin: 0 0 6px; font-size: 13px; color: var(--licht-2); }
.tauchgang__titel { margin: 0 0 10px; font-size: clamp(32px, 3.2vw, 46px); }
.tauchgang__text { margin: 0; font-size: 15.5px; line-height: 1.55; }
.tauchgang__text b { font-weight: 700; }
@media (max-width: 640px) {
  .tauchgang__tafel { bottom: 2.5vh; padding: 16px 18px; }
  .tauchgang__text { font-size: 14.5px; }
  .tauchgang__massstab { display: none; }
  .tauchgang__instrument { justify-content: flex-end; }
}

/* ── Periodensystem ─────────────────────── */
.pse { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 340px); gap: 28px clamp(24px, 4vw, 56px); align-items: start; }
.pse__tafel { display: grid; grid-template-columns: repeat(18, minmax(0, 1fr)); gap: 3px; }
.pse__el {
  aspect-ratio: 1; min-width: 0; padding: 0; border: 1px solid rgba(227,231,241,.08); border-radius: 2px;
  background: transparent; color: rgba(227,231,241,.26);
  display: grid; place-items: center; font-size: clamp(9px, 1vw, 14px); font-weight: 600; cursor: default;
}
.pse__el--an { cursor: pointer; color: var(--nacht); border: 0; background: var(--kat); }
.pse__el--an:hover, .pse__el--an[aria-pressed="true"] { outline: 2px solid var(--licht); outline-offset: 1px; }
.pse__el--luecke { border-style: dashed; font-size: 9px; }
.pse__info { border-top: 2px solid var(--licht); padding-top: 16px; min-height: 280px; }
.pse__gross { display: grid; grid-template-columns: auto 1fr; align-items: end; gap: 0 14px; }
.pse__z { grid-column: 1; font-size: 14px; color: var(--licht-2); }
.pse__sym { grid-column: 1; font: 400 108px/.8 var(--serif); color: var(--kat, var(--si)); }
.pse__name { grid-column: 2; grid-row: 2; font: 400 30px/1 var(--serif); padding-bottom: 6px; }
.pse__rolle { margin: 18px 0 6px; font-size: 14px; color: var(--kat, var(--si)); font-weight: 600; }
.pse__text { margin: 0; font-size: 15.5px; }
.pse__legende { grid-column: 1 / -1; list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 14px; color: var(--licht-2); }
.pse__legende li { display: flex; align-items: center; gap: 8px; }
.pse__legende i { width: 14px; height: 14px; border-radius: 2px; background: var(--kat); }
@media (max-width: 900px) { .pse { grid-template-columns: 1fr; } .pse__tafel { gap: 2px; } }

/* ── Stein ──────────────────────────────── */
.stein { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.stein figure { margin: 0; }
.kruste { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; max-width: 520px; }
.kruste i {
  aspect-ratio: 1; border-radius: 45% 55% 50% 40% / 50% 45% 55% 50%;
  background: var(--k); transform: rotate(var(--r)) scale(var(--s, 1));
  transition: transform .35s cubic-bezier(.3,1.6,.5,1), opacity .3s;
}
.kruste[data-hl] i { opacity: .22; }
.kruste[data-hl] i.hl { opacity: 1; --s: 1.12; }
.kruste__legende { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 6px 8px; max-width: 520px; }
.kruste__legende button {
  border: 1px solid var(--linie); background: transparent; border-radius: 30px; padding: 5px 12px 5px 8px;
  display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; color: var(--tinte);
}
.kruste__legende button i { width: 12px; height: 12px; border-radius: 50%; background: var(--k); }
.kruste__legende button[aria-pressed="true"] { background: var(--tinte); color: var(--gelb); }
.stein__tetra canvas { width: 100%; aspect-ratio: 1; max-width: 460px; cursor: grab; touch-action: none; }
.stein__tetra canvas:active { cursor: grabbing; }
.stein__tetra figcaption { font-size: 15px; max-width: 30em; color: var(--tinte-2); }
.stein__tetra figcaption b { color: var(--tinte); }
.randnotiz { margin: clamp(40px, 7vh, 80px) 0 0; max-width: 42em; padding: 22px 26px; background: var(--tinte); color: var(--gelb); border-radius: 3px; font-size: 16px; }
.randnotiz b { font: 400 24px/1 var(--serif); margin-right: 6px; }
@media (max-width: 900px) { .stein { grid-template-columns: 1fr; } }

/* ── Läuterung ──────────────────────────── */
.lauf__stationen { list-style: none; margin: 0 0 28px; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0; border-top: 2px solid var(--tinte); counter-reset: st; }
.lauf__stationen button {
  width: 100%; text-align: left; background: none; border: 0; padding: 12px 10px 14px 0; cursor: pointer;
  display: grid; gap: 4px; color: var(--tinte-3); position: relative;
}
.lauf__stationen button::before { content: ""; position: absolute; top: -2px; left: 0; right: 0; height: 2px; background: transparent; }
.lauf__stationen button[aria-selected="true"] { color: var(--tinte); }
.lauf__stationen button[aria-selected="true"]::before { height: 6px; top: -4px; background: var(--tinte); }
.lauf__stationen .nr { font-size: 13px; }
.lauf__stationen .nm { font: 400 clamp(18px, 1.9vw, 27px)/1.05 var(--serif); }
.lauf__buehne { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px clamp(24px, 4vw, 64px); }
.lauf__anzeige { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 24px; align-items: end; }
.lauf__etikett { display: block; font-size: 13px; color: var(--tinte-2); }
.lauf__prozent { display: block; font: 400 clamp(46px, 8.4vw, 132px)/.95 var(--serif); letter-spacing: -.02em; word-break: break-all; }
.lauf__neunen { display: block; margin-top: 6px; font-size: 15px; font-weight: 600; min-height: 1.6em; }
.lauf__grad { display: block; font: 400 clamp(40px, 5vw, 76px)/1 var(--serif); }
.thermo { margin-top: 10px; height: 10px; border-radius: 6px; background: rgba(31,22,6,.14); overflow: hidden; }
.thermo span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #3a2a0b, var(--glut) 70%, #fff3c4); transition: width .9s cubic-bezier(.2,.8,.2,1); }
.lauf__sieb { width: 100%; aspect-ratio: 40 / 30; border-radius: 3px; background: var(--tinte); }
.lauf__siebtext { grid-column: 1; margin: -8px 0 0; font-size: 14px; color: var(--tinte-2); }
.lauf__text { grid-column: 2; grid-row: 2 / span 2; }
.lauf__text p { margin: 0 0 12px; }
.lauf__gleichung { font: 400 italic clamp(20px, 1.9vw, 28px)/1.3 var(--serif); padding: 10px 0; border-top: 1px solid var(--linie); border-bottom: 1px solid var(--linie); }
@media (max-width: 900px) {
  .lauf__stationen { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lauf__buehne, .lauf__anzeige { grid-template-columns: 1fr; }
  .lauf__text { grid-column: 1; grid-row: auto; }
}

/* ── Czochralski ────────────────────────── */
.cz { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 400px); gap: clamp(24px, 4vw, 64px); align-items: center; }
.cz__canvas { width: 100%; aspect-ratio: 5 / 6; max-height: 82vh; border-radius: 3px; background: var(--tinte); }
.cz__erklaerung { font-size: 15px; color: var(--tinte-2); }
@media (max-width: 900px) { .cz { grid-template-columns: 1fr; } }

/* ── EUV ────────────────────────────────── */
.euv { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); align-items: center; }
.euv__canvas { width: 100%; aspect-ratio: 16 / 10; background: #07080F; border-radius: 3px; }
.euv__takt { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.euv__takt li { padding: 14px 0 14px 18px; border-left: 3px solid var(--linie); color: var(--tinte-3); transition: color .2s, border-color .2s; }
.euv__takt li b { display: block; font: 400 26px/1.1 var(--serif); }
.euv__takt li.an { color: var(--tinte); border-left-color: var(--tinte); }
.spiegel, .stapel { margin-top: clamp(56px, 10vh, 120px); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(24px, 5vw, 80px); align-items: start; }
.spiegel__rest { font: 400 30px/1.2 var(--serif); margin: 18px 0 0; }
.spiegel__rest output { font-size: 1.4em; }
.spiegel__balken { display: flex; align-items: flex-end; gap: 6px; height: 280px; border-bottom: 2px solid var(--tinte); padding-top: 26px; }
.spiegel__balken div { flex: 1; position: relative; background: var(--tinte); transition: height .45s cubic-bezier(.2,.8,.2,1), opacity .3s; min-height: 2px; }
.spiegel__balken div span { position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%); font-size: 11px; padding-bottom: 4px; white-space: nowrap; }
.spiegel__balken div.aus { opacity: .12; }
.stapel__bild { width: 100%; max-height: 80vh; }
.stapel__bild g.schicht { cursor: pointer; }
.stapel__bild g.schicht:focus-visible { outline: none; }
.stapel__bild g.schicht:focus-visible rect.rahmen, .stapel__bild g.schicht.an rect.rahmen { stroke: var(--tinte); stroke-width: 3; }
.stapel__info { margin-top: 20px; min-height: 150px; padding: 18px 20px; background: var(--tinte); color: var(--gelb); border-radius: 3px; }
.stapel__info b { display: block; font: 400 26px/1.1 var(--serif); margin-bottom: 6px; }
.stapel__info p { margin: 0; font-size: 15px; }
@media (max-width: 900px) { .euv, .spiegel, .stapel { grid-template-columns: 1fr; } .spiegel__balken { height: 200px; } }

/* ── Gitter & FET ───────────────────────── */
.gitter { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(260px, 1fr); gap: clamp(24px, 4vw, 56px); align-items: start; }
.gitter__canvas { width: 100%; aspect-ratio: 3 / 2; background: var(--tinte); border-radius: 3px; cursor: crosshair; touch-action: manipulation; }
.wahl { display: grid; gap: 8px; }
.wahl__knopf { text-align: left; border: 1px solid var(--tinte); background: transparent; padding: 10px 14px; border-radius: 3px; cursor: pointer; font-size: 15px; display: flex; gap: 12px; align-items: baseline; color: var(--tinte); }
.wahl__knopf b { font: 400 26px/1 var(--serif); min-width: 1.2em; }
.wahl__knopf[aria-checked="true"] { background: var(--tinte); color: var(--gelb); }
.schalter-zeile { display: flex; gap: 10px; align-items: center; margin-top: 18px; font-size: 15px; cursor: pointer; }
.schalter-zeile input { width: 20px; height: 20px; accent-color: var(--tinte); }
.gitter__zaehler { font: 400 22px/1.3 var(--serif); margin: 16px 0 0; }
.fet { margin-top: clamp(56px, 10vh, 120px); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: clamp(24px, 4vw, 64px); align-items: center; }
.fet__bild { width: 100%; }
@media (max-width: 900px) { .gitter, .fet { grid-template-columns: 1fr; } .fet__bild { order: -1; } }

/* ── NAND ───────────────────────────────── */
.nand { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(260px, 1fr); gap: clamp(24px, 4vw, 64px); align-items: center; }
.nand__bild { width: 100%; max-height: 78vh; }
.eingaenge { display: flex; gap: 12px; align-items: stretch; }
.bitknopf, .ausgang {
  flex: 1; display: grid; place-items: center; gap: 2px; padding: 14px 8px; border-radius: 3px;
  border: 2px solid var(--tinte); background: transparent; cursor: pointer; color: var(--tinte);
}
.bitknopf span, .ausgang span { font-size: 14px; }
.bitknopf b, .ausgang b { font: 400 64px/1 var(--serif); }
.bitknopf[aria-pressed="true"] { background: var(--tinte); color: var(--gelb); }
.ausgang { cursor: default; border-style: dashed; }
.ausgang.eins { background: var(--elek); border: 2px solid var(--elek); color: #fff; }
.wahrheit { margin-top: 22px; width: 100%; border-collapse: collapse; font-size: 17px; text-align: center; }
.wahrheit caption { text-align: left; font-size: 13px; color: var(--tinte-2); padding-bottom: 6px; }
.wahrheit th { font-weight: 600; border-bottom: 2px solid var(--tinte); padding: 6px; }
.wahrheit td { padding: 6px; border-bottom: 1px solid var(--linie); }
.wahrheit tr.an td { background: var(--tinte); color: var(--gelb); }
.nand__pfad { font-size: 15px; color: var(--tinte-2); min-height: 3.2em; }
@media (max-width: 900px) { .nand { grid-template-columns: 1fr; } }

/* ── Addierer ───────────────────────────── */
.addierer { display: grid; gap: 14px; }
.addierer__zeile { display: grid; grid-template-columns: 140px minmax(0, 1fr); gap: 20px; align-items: center; }
.addierer__zahl { display: grid; gap: 2px; font-size: 13px; color: var(--tinte-2); }
.addierer__zahl input, .addierer__zahl output {
  font: 400 54px/1 var(--serif); color: var(--tinte); background: transparent; border: 0; border-bottom: 2px solid var(--tinte);
  width: 100%; padding: 0 0 2px; -moz-appearance: textfield; appearance: textfield;
}
.addierer__zahl input::-webkit-inner-spin-button { -webkit-appearance: none; }
.addierer__zahl--summe output { border-bottom-width: 4px; }
.addierer__bits { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 8px; }
.addierer__bits button, .addierer__bits span {
  aspect-ratio: 1 / 1.1; border: 2px solid var(--tinte); border-radius: 3px; background: transparent; cursor: pointer;
  display: grid; place-items: center; font: 400 clamp(26px, 3.6vw, 52px)/1 var(--serif); position: relative; color: var(--tinte);
}
.addierer__bits button[aria-pressed="true"] { background: var(--tinte); color: var(--gelb); }
.addierer__bits button small, .addierer__bits span small { position: absolute; bottom: 4px; right: 6px; font: 600 10px/1 var(--sans); opacity: .6; }
.addierer__bits--summe span { cursor: default; border-style: solid; transition: background .15s, color .15s; }
.addierer__bits--summe span.eins { background: var(--elek); border-color: var(--elek); color: #fff; }
.addierer__bits--summe span.warte { opacity: .25; }
.addierer__kette { margin-left: 160px; display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 8px; height: 76px; }
.addierer__kette div { position: relative; border: 1px dashed var(--tinte-3); border-radius: 3px; display: grid; place-items: center; font-size: 12px; color: var(--tinte-2); text-align: center; line-height: 1.2; transition: background .12s; }
.addierer__kette div.aktiv { background: rgba(31,22,6,.14); border-style: solid; border-color: var(--tinte); color: var(--tinte); }
.addierer__kette div .carry { position: absolute; left: -10px; top: 50%; transform: translate(-50%, -50%); width: 14px; height: 14px; border-radius: 50%; background: var(--gelb); border: 2px solid var(--tinte); z-index: 2; }
.addierer__kette div .carry.eins { background: var(--elek); border-color: var(--elek); box-shadow: 0 0 10px var(--elek); }
.addierer__kette div:first-child .carry { display: none; }
.addierer__bilanz { margin: 16px 0 0 160px; font: 400 clamp(20px, 1.8vw, 26px)/1.35 var(--serif); max-width: 34em; }
@media (max-width: 700px) {
  .addierer__zeile { grid-template-columns: 1fr; gap: 8px; }
  .addierer__kette, .addierer__bilanz { margin-left: 0; }
  .addierer__bits, .addierer__kette { gap: 4px; }
  .addierer__kette { height: 60px; }
  .addierer__kette div { font-size: 0; }
  .addierer__kette div::before { content: "+"; font: 400 22px/1 var(--serif); }
}

/* ── Finale ─────────────────────────────── */
.finale { padding-bottom: 60px; }
.finale .kapitel__titel { font-size: clamp(84px, 13vw, 210px); line-height: .85; background: var(--iris); -webkit-background-clip: text; background-clip: text; color: transparent; }
.takt__licht { position: relative; height: 80px; margin: 40px 0 0; }
.takt__strahl { position: absolute; left: 0; top: 30px; width: 6cm; height: 4px; background: #fff; box-shadow: 0 0 18px 4px rgba(160,190,255,.9), 0 0 60px 10px rgba(120,120,255,.45); border-radius: 2px; transform-origin: left; animation: blitz 1.6s cubic-bezier(.2,.8,.2,1) infinite; }
.takt__strahl::before, .takt__strahl::after { content: ""; position: absolute; top: -12px; width: 1px; height: 28px; background: var(--licht-2); }
.takt__strahl::before { left: 0; } .takt__strahl::after { right: 0; }
.takt__mass { position: absolute; left: 0; top: 52px; font: 400 26px/1 var(--serif); }
@keyframes blitz { 0% { transform: scaleX(0); opacity: 1; } 30% { transform: scaleX(1); opacity: 1; } 100% { transform: scaleX(1); opacity: .25; } }
@media (prefers-reduced-motion: reduce) { .takt__strahl { animation: none; } }
.takt__fuss { margin: 6px 0 0; font-size: 14px; color: var(--licht-2); }
.zaehler { margin: clamp(60px, 12vh, 140px) 0 0; }
.zaehler p { margin: 0; max-width: 40em; }
.zaehler__zahl { display: block; font: 400 clamp(44px, 9vw, 150px)/1 var(--serif); letter-spacing: -.02em; margin: 12px 0 18px; overflow-wrap: anywhere; }
.zaehler__klein { color: var(--licht-2); }
.quellen { margin-top: clamp(80px, 14vh, 160px); padding-top: 24px; border-top: 1px solid rgba(227,231,241,.2); max-width: 52em; color: var(--licht-2); font-size: 14px; }
.quellen h3 { font-size: 26px; color: var(--licht); }
.quellen ul { padding-left: 18px; margin: 0; display: grid; gap: 6px; }