/*
 * Fallstudie Prüflabor: Dramaturgie "Nacht zu Morgen".
 * Problem-Kapitel dunkel (Midnight), am Wendepunkt Verlauf ins Helle, Lösung hell.
 * Nutzt ausschließlich Tokens aus brt.css (Blau-Akzent, Inter, Radien).
 * Formensprache: Container --radius-lg, Chips Pille, kein weiterer Akzent.
 */

.fs {
  --fs-night: #080d16;
  --fs-night-2: var(--color-accent-midnight);
  --fs-line-dark: rgba(255, 255, 255, 0.14);
  --fs-soft-on-dark: rgba(255, 255, 255, 0.76);
  --fs-measure: 62ch;
}

/* ---------- Nacht-Hülle (Hero + Problem-Kapitel) ---------- */

.fs-night {
  position: relative;
  color: #fff;
  background: linear-gradient(180deg, var(--fs-night) 0%, #0a1426 60%, var(--fs-night-2) 100%);
}

.fs-night .brt-body {
  max-width: var(--fs-measure);
  margin: 0 0 var(--space-5);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--fs-soft-on-dark);
}

.fs-night .brt-body strong {
  color: #fff;
}

.fs-h2 {
  margin: 0 0 var(--space-6);
  max-width: 20ch;
  font-size: clamp(2rem, 4.6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: inherit;
  text-wrap: balance;
}

.fs-chapter {
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
}

.fs-split {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
}

@media (min-width: 1024px) {
  .fs-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }
}

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

.fs-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(6.5rem, 11vw, 8rem) 0 clamp(2.5rem, 5vw, 4rem);
}

.fs-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 55% 60% at 88% 30%, rgba(11, 95, 255, 0.2), transparent 70%);
  pointer-events: none;
}

.fs-hero > .brt-container {
  position: relative;
  z-index: 1;
}

.fs-hero__grid {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4rem);
  align-items: end;
}

@media (min-width: 1024px) {
  .fs-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

.fs-hero .brt-tag {
  color: var(--color-accent-light);
}

.fs-hero .brt-h1 {
  margin: 0 0 var(--space-6);
  color: #fff;
  font-size: clamp(2.25rem, 5.4vw, 4.25rem);
  text-wrap: balance;
}

.fs-hero__lead {
  max-width: 40ch;
  margin: 0 0 var(--space-8);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.55;
  color: var(--fs-soft-on-dark);
}

.fs-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.fs-pain {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--fs-line-dark);
}

.fs-pain li {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-5);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--fs-line-dark);
}

.fs-pain strong {
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: #fff;
  white-space: nowrap;
}

.fs-pain strong small {
  margin-left: 0.18em;
  font-size: 0.38em;
  letter-spacing: 0;
  color: var(--color-accent-light);
}

.fs-pain span {
  max-width: 22ch;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--fs-soft-on-dark);
}

.fs-note {
  padding-block: var(--space-6);
  border-top: 1px solid var(--fs-line-dark);
}

.fs-note p {
  max-width: 80ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--fs-soft-on-dark);
}

.fs-note strong {
  color: #fff;
}

/* ---------- Versprochen vs. passiert ---------- */

.fs-promise {
  display: grid;
  gap: var(--space-10);
  margin-top: var(--space-10);
}

@media (min-width: 768px) {
  .fs-promise {
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 5vw, 4rem);
  }
}

.fs-promise h3 {
  margin: 0 0 var(--space-4);
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
}

.fs-promise ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.fs-promise li {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--fs-line-dark);
  font-size: 1.0625rem;
  line-height: 1.5;
}

.fs-promise__said li {
  color: rgba(255, 255, 255, 0.58);
  text-decoration: line-through;
  text-decoration-color: rgba(126, 176, 255, 0.8);
  text-decoration-thickness: 2px;
}

.fs-promise__was li {
  color: #fff;
}

/* ---------- Pflichten-Chips ---------- */

.fs-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-6) 0 var(--space-8);
  padding: 0;
}

.fs-pills li {
  padding: 0.55rem 1.1rem;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  font-size: 0.9375rem;
  line-height: 1.3;
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.fs-pills li:last-child {
  border-style: dashed;
  color: var(--fs-soft-on-dark);
}

/* ---------- Vier Brandherde ---------- */

.fs-fires {
  list-style: none;
  display: grid;
  margin: var(--space-10) 0 0;
  padding: 0;
}

@media (min-width: 768px) {
  .fs-fires {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(2rem, 5vw, 4rem);
  }
}

.fs-fires li {
  padding: var(--space-6) 0 var(--space-8);
  border-top: 1px solid rgba(126, 176, 255, 0.4);
}

.fs-fires h3 {
  margin: 0 0 var(--space-3);
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.25;
  color: #fff;
}

.fs-fires p {
  margin: 0;
  line-height: 1.65;
  color: var(--fs-soft-on-dark);
}

/* ---------- Aufgaben-Wand ---------- */

.fs-wall {
  list-style: none;
  margin: 0;
  padding: 0;
}

.fs-wall li {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--fs-line-dark);
  font-size: clamp(1.5rem, 3.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: rgba(255, 255, 255, 0.5);
}

.fs-wall li:last-child {
  border-bottom: 0;
  color: #fff;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-light);
  text-decoration-thickness: 3px;
  text-underline-offset: 0.14em;
}

/* ---------- Wendepunkt: harter Schnitt Nacht → Weiss ---------- */

.fs-turn {
  padding-block: clamp(3rem, 6vw, 5rem);
  color: #fff;
  background: var(--fs-night-2);
}

.fs-turn .fs-h2 {
  max-width: 22ch;
}

.fs-turn .brt-body {
  max-width: var(--fs-measure);
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--fs-soft-on-dark);
}

/* ---------- Timeline (hell) ---------- */

.fs-light {
  background: #fff;
  color: var(--color-ink);
}

.fs-light .fs-h2 {
  color: var(--color-ink);
}

.fs-light .brt-body {
  max-width: var(--fs-measure);
  margin: 0 0 var(--space-5);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.fs-light .brt-body strong {
  color: var(--color-ink);
}

.fs-timeline {
  list-style: none;
  position: relative;
  display: grid;
  gap: clamp(3rem, 7vw, 5rem);
  margin: 0;
  padding: 0;
}

.fs-timeline::before,
.fs-timeline::after {
  content: "";
  position: absolute;
  left: calc(1.5rem - 1px);
  top: 1.5rem;
  bottom: 1.5rem;
  width: 2px;
}

.fs-timeline::before {
  background: var(--color-line);
}

.fs-timeline::after {
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-light));
  transform-origin: top;
}

@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .fs-timeline::after {
      animation: fs-grow linear both;
      animation-timeline: view();
      animation-range: cover 12% cover 78%;
    }
  }
}

@keyframes fs-grow {
  from {
    transform: scaleY(0);
  }

  to {
    transform: scaleY(1);
  }
}

.fs-step {
  position: relative;
  padding-left: 4.5rem;
}

.fs-step__marker {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  background: #fff;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent);
}

.fs-step__body {
  display: grid;
  gap: var(--space-8);
}

.fs-step h3 {
  margin: 0 0 var(--space-4);
  font-size: clamp(1.5rem, 2.8vw, 2.125rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-wrap: balance;
}

@media (min-width: 1024px) {
  .fs-step {
    padding-left: 6rem;
  }

  .fs-step__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }
}

.fs-checks {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin: var(--space-5) 0 0;
  padding: 0;
}

.fs-checks li {
  position: relative;
  padding-left: 2rem;
  line-height: 1.55;
  color: var(--color-ink-soft);
}

.fs-checks li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.45em;
  width: 0.7rem;
  height: 0.4rem;
  border-left: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: rotate(-45deg);
}

.fs-results {
  display: grid;
  gap: var(--space-4);
}

.fs-result {
  padding: var(--space-6);
  border: 1px solid rgba(11, 95, 255, 0.14);
  border-radius: var(--radius-lg);
  background: var(--color-accent-soft);
}

.fs-result__num {
  display: block;
  font-size: clamp(2.25rem, 4.6vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

.fs-result__old {
  display: block;
  margin-bottom: var(--space-2);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-muted);
  text-decoration: line-through;
  text-decoration-thickness: 2px;
}

.fs-result__label {
  display: block;
  margin-top: var(--space-3);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-ink-soft);
}

/* ---------- Warum es funktioniert ---------- */

.fs-network {
  background: var(--color-bg-alt);
  color: var(--color-ink);
}

.fs-pillars {
  list-style: none;
  display: grid;
  margin: var(--space-10) 0 var(--space-8);
  padding: 0;
}

@media (min-width: 768px) {
  .fs-pillars {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(2rem, 5vw, 4rem);
  }
}

.fs-pillars li {
  padding: var(--space-6) 0 var(--space-8);
  border-top: 2px solid var(--color-ink);
}

.fs-pillars h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.fs-pillars p {
  margin: 0;
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- Finale: Erleichterung ---------- */

.fs-finale {
  background: linear-gradient(180deg, #fff 0%, var(--color-accent-soft) 100%);
  color: var(--color-ink);
}

.fs-finale .brt-tag {
  color: var(--color-accent);
}

.fs-finale .fs-h2 {
  max-width: 16ch;
  font-size: clamp(2.25rem, 5.4vw, 4.25rem);
  color: var(--color-ink);
}

.fs-finale__text {
  max-width: 54ch;
  margin: 0 0 var(--space-10);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.fs-relief {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8) var(--space-6);
  margin: 0;
  padding: 0;
}

@media (min-width: 1024px) {
  .fs-relief {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .fs-relief li + li {
    padding-left: var(--space-6);
    border-left: 1px solid rgba(11, 95, 255, 0.22);
  }
}

.fs-relief strong {
  display: block;
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

.fs-relief span {
  display: block;
  margin-top: var(--space-3);
  max-width: 20ch;
  font-size: 0.9375rem;
  line-height: 1.45;
  color: var(--color-ink-soft);
}