/* ============================================================
   KRAFTWERK — Landingpage
   Dunkle Fassung des rehaMED-Designsystems (Stand Juli 2026)
   Kohle als Grund, Archivo Black führt, Rost = ein CTA pro Screen
   ============================================================ */

:root {
  /* Neutral */
  --kohle:     #14171A;
  --anthrazit: #23282D;
  --stahl:     #454E56;
  --beton:     #8B939A;
  --nebel:     #C9CDD1;
  --kalk:      #E9E7E3;
  --papier:    #F5F4F1;
  --weiss:     #FFFFFF;
  /* Signal */
  --rost:      #B4552A;
  --glut:      #D9743F;
  /* Schrift */
  --sans: 'Source Sans 3', 'Segoe UI', system-ui, sans-serif;
  --arch: 'Archivo', 'Arial Narrow', Helvetica, sans-serif;
  /* Raster */
  --u:  8px;
  --u2: 16px;
  --u3: 24px;
  --u4: 32px;
  --u6: 48px;
  --u8: 64px;
  --u12: 96px;
  --u16: 128px;
  /* Linien: keine Haarlinien — trennende Linien mindestens 2px */
  --linie: 2px solid rgba(255,255,255,.09);
  --header-h: 76px;
}

/* ---------- Reset & Grundtypo ---------- */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

[id] { scroll-margin-top: calc(var(--header-h) + 16px); }

body {
  background: var(--kohle);
  color: var(--nebel);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }

a { color: var(--glut); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible { outline: 2px solid var(--glut); outline-offset: 3px; }

::selection { background: var(--rost); color: var(--weiss); }

h1, h2, h3 { color: var(--weiss); font-family: var(--arch); }

p { max-width: 62ch; }

.wrap {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 48px);
}

/* Skip-Link */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--rost); color: var(--weiss);
  padding: 12px 20px; font-family: var(--arch); font-weight: 600;
}
.skip:focus { left: 0; }

/* ---------- Bausteine ---------- */

.eyebrow {
  font-family: var(--arch);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--beton);
  display: flex;
  align-items: center;
  gap: var(--u2);
  margin-bottom: var(--u3);
}
.eyebrow::before {
  content: "";
  width: 34px;
  height: 3px;
  background: var(--rost);
  flex: none;
}

h2 {
  font-weight: 900;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.02;
  text-transform: uppercase;
  letter-spacing: .005em;
  margin-bottom: var(--u4);
  max-width: 18ch;
}

.lead { font-size: clamp(1.06rem, 1.4vw, 1.25rem); color: var(--kalk); }

/* Primäre Schaltfläche — Rost, rechtwinklig, keine Schatten.
   Genau eine pro Screen. */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--rost);
  color: var(--weiss);
  font-family: var(--arch);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 18px 30px;
  border: 0;
  cursor: pointer;
}
.btn:hover { background: var(--glut); text-decoration: none; }
.btn svg { flex: none; }

/* Stiller Pfeillink (Glut) — für Karten, damit die Ein-CTA-Regel hält */
.pfeil {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--arch);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--glut);
}
.pfeil::after { content: "→"; font-size: 1.15em; transition: transform .25s; }
.pfeil:hover { text-decoration: none; }
.pfeil:hover::after { transform: translateX(5px); }

/* Sichtbarer Platzhalter (Playbook-Konvention) */
.todo {
  border: 2px dashed rgba(217,116,63,.55);
  padding: 10px 14px;
  color: var(--beton);
  font-size: 15px;
}
.todo::before {
  content: "Platzhalter";
  display: block;
  font-family: var(--arch);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--glut);
  margin-bottom: 2px;
}

/* Reveal-Bewegung */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Header ---------- */

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: var(--kohle);
  border-bottom: var(--linie);
  height: var(--header-h);
}
.header .wrap {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--u3);
}
.brand { display: flex; align-items: center; }
.brand img { height: 46px; width: auto; }

.nav { display: flex; align-items: center; gap: clamp(16px, 2.6vw, 34px); }
.nav a {
  font-family: var(--arch);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--nebel);
}
.nav a:hover { color: var(--weiss); text-decoration: none; }

/* Header-CTA: erscheint erst, wenn der Hero-CTA aus dem Bild ist */
.header .btn {
  padding: 12px 20px;
  font-size: 13px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .35s, transform .35s, visibility .35s;
}
body.past-hero .header .btn {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* Burger */
.burger {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  width: 44px; height: 44px;
  position: relative;
}
.burger span, .burger span::before, .burger span::after {
  content: "";
  position: absolute;
  left: 10px;
  width: 24px; height: 2px;
  background: var(--weiss);
  transition: transform .3s, top .3s, opacity .3s;
}
.burger span { top: 21px; }
.burger span::before { top: -8px; left: 0; }
.burger span::after  { top:  8px; left: 0; }
body.nav-open .burger span { background: transparent; }
body.nav-open .burger span::before { top: 0; transform: rotate(45deg); }
body.nav-open .burger span::after  { top: 0; transform: rotate(-45deg); }

@media (max-width: 860px) {
  .burger { display: block; }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--kohle);
    border-bottom: var(--linie);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--u3) clamp(20px, 5vw, 48px) var(--u4);
    gap: var(--u3);
    display: none;
  }
  body.nav-open .nav { display: flex; }
  .nav a { font-size: 16px; }
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: max(92vh, 620px);
  display: flex;
  align-items: flex-end;
  padding-top: var(--header-h);
  overflow: hidden;
}
.hero picture, .hero img.bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero img.bg { object-fit: cover; object-position: 68% 40%; }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(20,23,26,.55) 0%, rgba(20,23,26,.15) 35%, rgba(20,23,26,.9) 88%),
    linear-gradient(90deg, rgba(20,23,26,.88) 0%, rgba(20,23,26,.45) 55%, rgba(20,23,26,.2) 100%);
}
.hero .wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-bottom: clamp(48px, 8vh, 96px);
}
.hero .eyebrow { color: var(--kalk); }
.hero h1 {
  font-weight: 900;
  font-size: clamp(3.2rem, 10.5vw, 8.5rem);
  line-height: .92;
  text-transform: uppercase;
  letter-spacing: .002em;
  margin-bottom: var(--u3);
}
.hero .lead {
  color: var(--kalk);
  max-width: 46ch;
  margin-bottom: var(--u4);
}
.cta-zeile { display: flex; align-items: center; gap: var(--u3); flex-wrap: wrap; }
.cta-hint { font-size: 15px; color: var(--beton); }
.absender {
  margin-top: var(--u6);
  padding-top: var(--u3);
  border-top: var(--linie);
  font-family: var(--arch);
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--beton);
}

/* ---------- Sektionen ---------- */

section { padding-block: clamp(72px, 11vw, 128px); }
.sektion-anthrazit { background: var(--anthrazit); }

/* Einstieg */
.karten {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--u3);
  margin-top: var(--u6);
}
.karte {
  background: var(--anthrazit);
  padding: var(--u4);
  display: flex;
  flex-direction: column;
  gap: var(--u2);
  border-top: 3px solid var(--rost);
}
.sektion-anthrazit .karte { background: var(--kohle); }
.karte .nr {
  font-family: var(--arch);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--rost);
}
.karte h3 {
  font-weight: 900;
  font-size: 1.45rem;
  line-height: 1.1;
  text-transform: uppercase;
}
.karte p { flex: 1; font-size: 16.5px; }
@media (max-width: 860px) {
  .karten { grid-template-columns: 1fr; }
}

/* Das Kraftwerk */
.split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.split .bild img { width: 100%; }
@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; }
}
.split p + p { margin-top: var(--u3); }
.betont { color: var(--kalk); font-weight: 600; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--u3);
  margin-top: var(--u8);
  padding-top: var(--u4);
  border-top: var(--linie);
}
.stat .wert {
  font-family: var(--arch);
  font-weight: 900;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  color: var(--rost);
  line-height: 1;
}
.stat .label {
  font-family: var(--arch);
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--beton);
  margin-top: 8px;
}
@media (max-width: 860px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
}

.strecke {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--u3);
  margin-top: var(--u8);
}
.strecke img { width: 100%; aspect-ratio: 3 / 4; object-fit: cover; }
@media (max-width: 860px) {
  .strecke { grid-template-columns: 1fr; }
  .strecke img { aspect-ratio: 4 / 3; }
}

/* Ablauf */
.schritte {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--u3);
  margin-top: var(--u6);
  counter-reset: schritt;
}
.schritt {
  border-top: var(--linie);
  padding-top: var(--u3);
}
.schritt .nr {
  font-family: var(--arch);
  font-weight: 900;
  font-size: clamp(2.6rem, 5vw, 3.6rem);
  line-height: 1;
  color: var(--rost);
}
.schritt h3 {
  font-weight: 900;
  font-size: 1.3rem;
  text-transform: uppercase;
  margin: var(--u2) 0;
}
.schritt p { font-size: 16.5px; }
@media (max-width: 860px) {
  .schritte { grid-template-columns: 1fr; }
}
.ablauf-cta { margin-top: var(--u8); }

/* Gesichter */
.gesichter {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.gesichter .bild img { width: 100%; }
.person { padding-block: var(--u3); }
.person + .person { border-top: var(--linie); }
.person .rolle {
  font-family: var(--arch);
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--beton);
  margin-top: 6px;
}
@media (max-width: 860px) {
  .gesichter { grid-template-columns: 1fr; }
}

/* Whitepaper */
.wp-karte .format {
  font-family: var(--arch);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--beton);
}

/* FAQ */
.faq { max-width: 820px; }
.faq details { border-top: var(--linie); }
.faq details:last-of-type { border-bottom: var(--linie); }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--u3);
  padding: var(--u3) 0;
  font-family: var(--arch);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--weiss);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--arch);
  font-weight: 400;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--glut);
  flex: none;
  transition: transform .3s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding-bottom: var(--u3); max-width: 68ch; }

/* Kontakt */
.kontakt-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--u4);
  margin-top: var(--u6);
  margin-bottom: var(--u8);
}
.kontakt-grid h3 {
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--beton);
  margin-bottom: var(--u2);
}
.kontakt-grid p, .kontakt-grid a { font-size: 17px; }
.kontakt-grid .gross { color: var(--kalk); }
@media (max-width: 860px) {
  .kontakt-grid { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */

footer {
  border-top: var(--linie);
  padding-block: var(--u6);
  font-size: 15px;
  color: var(--beton);
}
footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--u3);
}
footer img { height: 40px; width: auto; opacity: .85; }
footer nav { display: flex; gap: var(--u3); }
footer a { color: var(--beton); }
footer a:hover { color: var(--nebel); }
.credit { width: 100%; font-size: 13px; }

/* ---------- Rechtsseiten ---------- */

.rechtsseite { padding-top: calc(var(--header-h) + var(--u8)); padding-bottom: var(--u12); }
.rechtsseite h1 {
  font-weight: 900;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  text-transform: uppercase;
  margin-bottom: var(--u6);
}
.rechtsseite h2 {
  font-size: 1.3rem;
  margin-top: var(--u6);
  margin-bottom: var(--u2);
  max-width: none;
}
.rechtsseite p, .rechtsseite li { max-width: 72ch; }
.rechtsseite ul { padding-left: 1.2em; }
.rechtsseite .todo { margin-top: var(--u2); max-width: 72ch; }