@font-face {
  /*noinspection CssNoGenericFontName*/
  font-family: "Frutiger LT Pro";
  src: url("fonts/frutiger-lt-pro/Linotype  FrutigerLTProRoman.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  /*noinspection CssNoGenericFontName*/
  font-family: "Frutiger LT Pro 45 Light";
  src: url("fonts/frutiger-lt-pro/Linotype  FrutigerLTProLight.otf") format("opentype");
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

@font-face {
  /*noinspection CssNoGenericFontName*/
  font-family: "Frutiger LT Pro 65 Bold";
  src: url("fonts/frutiger-lt-pro/Linotype  FrutigerLTProBold.otf") format("opentype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  /*noinspection CssNoGenericFontName*/
  font-family: "Frutiger LT Pro 95 Ultra Black";
  src: url("fonts/frutiger-lt-pro/Linotype  FrutigerLTProUltraBlack.otf") format("opentype");
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  /*noinspection CssNoGenericFontName*/
  font-family: "Capture it";
  src: url("fonts/Capture-it/Capture-it/WEBFONTS/capture_it-webfont.woff") format("woff");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --verdi-rot: #e30045;
  --verdi-grau-1: #8C8E91;
  --verdi-grau-2: #E2E4E5;
  --bg-light-rose: #f8ecec;
  --quiz-green: #2f7d59;
  --quiz-pale-green: #d8eee3;
  --quiz-dark-red: #a80032;
  --quiz-pale-red: #f3d4dc;
  --accent-text-color: var(--verdi-rot);
  --text-color: #191919;
  --surface-color: #fbf8f8;
  --surface-muted: #f6f7f7;
  --border-color: rgba(25, 25, 25, 0.14);
  --shadow-color: rgba(25, 25, 25, 0.14);
  --button-text: #ffffff;
  --font-default: "Frutiger LT Pro";
  --font-light: "Frutiger LT Pro 45 Light";
  --font-bold: "Frutiger LT Pro 65 Bold";
  --font-ultra: "Frutiger LT Pro 95 Ultra Black";
  --font-capture: "Capture it";
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scrollbar-gutter: stable;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-y: scroll;
  background: var(--bg-light-rose);
  color: var(--text-color);
  font-family: var(--font-default), Arial, sans-serif;
  line-height: 1.55;
}

body.theme-dark {
  --accent-text-color: #e6b1c1;
  --text-color: #f5f5f5;
  --surface-color: #27292b;
  --surface-muted: #36393c;
  --border-color: rgba(255, 255, 255, 0.18);
  --shadow-color: rgba(0, 0, 0, 0.35);
  background: #211f20;
}

button,
input {
  font: inherit;
}

.learning-shell {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 32px 16px;
}

.page-grid {
  display: grid;
  gap: 16px;
}

.top-bar,
.progress-item,
.page-number-box,
.content-box {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 16px 40px var(--shadow-color);
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
}

.chapter-meta {
  min-width: 0;
}

.chapter-indicator {
  margin: 0 0 4px;
  color: var(--accent-text-color);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.chapter-title {
  margin: 0;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.25;
}

.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.mode-toggle {
  display: inline-flex;
  align-items: center;
  position: relative;
  gap: 8px;
  width: 124px;
  height: 60px;
  padding: 6px;
  background: #dfe5ec;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  user-select: none;
}

body.theme-dark .mode-toggle {
  background: #34383d;
  border-color: rgba(255, 255, 255, 0.22);
}

.mode-toggle input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.toggle-slider {
  position: absolute;
  top: 6px;
  left: 6px;
  z-index: 0;
  width: 52px;
  height: 48px;
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 2px 4px rgba(25, 25, 25, 0.18);
  transition: transform 180ms ease;
}

body.theme-dark .toggle-slider {
  background: #1f2226;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.45);
}

.mode-toggle input:checked + .toggle-slider {
  transform: translateX(60px);
}

.toggle-icon {
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
  width: 52px;
  height: 48px;
  font-size: 1.25rem;
  line-height: 1;
}

.button {
  min-height: 60px;
  padding: 0 20px;
  background: var(--verdi-rot);
  color: var(--button-text);
  border: 0;
  border-radius: 12px;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  cursor: pointer;
}

.button:hover {
  filter: brightness(0.94);
}

.button:focus-visible,
.mode-toggle:focus-within {
  outline: 3px solid rgba(227, 0, 69, 0.35);
  outline-offset: 2px;
}

.button-secondary {
  background: var(--surface-muted);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.progress-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.progress-item {
  display: grid;
  gap: 8px;
  padding: 18px;
}

.progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-weight: 700;
}

.progress-value {
  color: var(--verdi-rot);
  font-variant-numeric: tabular-nums;
}

.progress-track {
  height: 14px;
  overflow: hidden;
  background: var(--surface-muted);
  border: 1px solid var(--border-color);
  border-radius: 999px;
}

.progress-fill {
  width: 0;
  height: 100%;
  background: var(--verdi-rot);
  border-radius: inherit;
  transition: width 180ms ease;
}

.content-box {
  padding: clamp(20px, 4vw, 40px);
}

.video-shell {
  position: relative;
  width: 100%;
  margin: 0 0 24px;
}

.content-video {
  display: block;
  width: 100%;
  max-height: 70vh;
  background: #000000;
  border-radius: 12px;
}

.video-play-button {
  position: absolute;
  inset: 50% auto auto 50%;
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  padding: 0 0 0 7px;
  transform: translate(-50%, -50%);
  background: var(--verdi-rot);
  color: #ffffff;
  border: 0;
  border-radius: 50%;
  box-shadow: 0 12px 34px rgba(25, 25, 25, 0.35);
  font-family: Arial, sans-serif;
  font-size: 3rem;
  line-height: 1;
  cursor: pointer;
}

.video-play-button:focus-visible {
  outline: 4px solid rgba(227, 0, 69, 0.35);
  outline-offset: 4px;
}

.video-shell.is-playing .video-play-button {
  display: none;
}

.page-number-box {
  padding: 18px;
}

.page-number {
  margin: 0;
  color: var(--verdi-grau-1);
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-size: 1.2rem;
  line-height: 1;
  text-align: right;
}

.content-heading {
  margin: 0 0 1rem;
  color: var(--accent-text-color);
  font-family: var(--font-capture), Arial, sans-serif;
  font-weight: 400;
  font-size: 3rem;
  line-height: 1.2;
}

.content-heading-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin: 0 0 1rem;
}

.content-heading-row .content-heading {
  margin: 0;
}

.content-subheading {
  margin: 1.5rem 0 0.75rem;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.25;
}

.content-subheading-task {
  padding-top: 1rem;
}

.quiz-reset-button {
  flex: 0 0 auto;
  background: var(--verdi-grau-1);
  min-height: 44px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 1rem;
}

.content-box p {
  margin: 0 0 1rem;
  font-family: var(--font-light), var(--font-default), Arial, sans-serif;
  font-weight: 300;
  font-size: 1.08rem;
}

.content-box strong {
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
}

.content-box p:last-child {
  margin-bottom: 0;
}

.content-box .content-source {
  margin-top: 0.25rem;
  font-family: var(--font-light), var(--font-default), Arial, sans-serif;
  font-size: 0.9rem;
  font-weight: 300;
  overflow-wrap: anywhere;
}

.content-source a {
  color: inherit;
  text-decoration: underline;
}

.content-list {
  margin: 0 0 1.25rem;
  padding-left: 2rem;
  font-family: var(--font-light), var(--font-default), Arial, sans-serif;
  font-size: 1.08rem;
  font-weight: 300;
}

.content-list li {
  margin-bottom: 0.35rem;
  padding-left: 0.2rem;
}

.content-list li::marker {
  color: var(--verdi-rot);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.comparison-card,
.reveal-box,
.text-task-box {
  background: var(--surface-muted);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

.comparison-card {
  padding: 20px;
}

.comparison-label {
  margin: 0 0 10px;
  color: var(--accent-text-color);
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
}

.comparison-card .comparison-text {
  margin: 0;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.25;
}

.reveal-box {
  margin: 24px 0;
  overflow: hidden;
  transition: box-shadow 180ms ease, transform 180ms ease;
}

.reveal-box:hover {
  transform: translateY(2px);
  box-shadow: inset 0 4px 12px rgba(25, 25, 25, 0.16);
}

.reveal-button {
  width: 100%;
  padding: 20px;
  background: transparent;
  color: var(--text-color);
  border: 0;
  text-align: left;
  cursor: pointer;
}

.reveal-title {
  margin: 0;
}

.reveal-content {
  padding: 0 20px 20px;
}

.text-task-box {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  padding: 20px;
}

.text-task-label {
  display: grid;
  gap: 10px;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
  font-size: 1.08rem;
}

.text-task-input {
  width: 100%;
  min-height: 60px;
  padding: 14px;
  resize: vertical;
  background: var(--surface-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  font-family: var(--font-default), Arial, sans-serif;
  font-weight: 400;
  font-size: 1.08rem;
}

.text-task-input:focus {
  outline: 3px solid rgba(227, 0, 69, 0.35);
  outline-offset: 2px;
}

.text-task-submit {
  justify-self: start;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 1rem;
}

.text-task-feedback {
  margin: 0;
  color: var(--accent-text-color);
  font-size: 0.95rem;
}

.text-task-feedback.is-complete {
  color: var(--quiz-green);
}

.sort-task-box {
  display: grid;
  gap: 16px;
  margin-top: 20px;
  padding: 20px;
  background: var(--surface-muted);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

.sort-game {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(360px, 1.1fr);
  align-items: start;
  gap: 18px;
  overflow: visible;
  scrollbar-gutter: stable;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.sort-game::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.sort-game::-webkit-scrollbar-track {
  background: var(--surface-color);
  border-radius: 999px;
}

.sort-game::-webkit-scrollbar-thumb {
  background: var(--verdi-grau-1);
  border: 3px solid var(--surface-color);
  border-radius: 999px;
}

.sort-card-bank {
  display: grid;
  grid-template-columns: 1fr;
  align-content: start;
  gap: 10px;
  min-width: 280px;
}

.sort-slots {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  min-width: 360px;
}

.sort-card,
.sort-slot,
.sort-bank-placeholder {
  min-height: 64px;
  border-radius: 10px;
}

.sort-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--surface-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  box-shadow: 0 6px 18px rgba(25, 25, 25, 0.08);
  cursor: grab;
  touch-action: none;
  user-select: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.sort-card:hover {
  border-color: rgba(227, 0, 69, 0.32);
  box-shadow: 0 10px 24px rgba(25, 25, 25, 0.12);
  transform: translateY(-1px);
}

.sort-card:focus-visible {
  outline: 3px solid rgba(227, 0, 69, 0.35);
  outline-offset: 2px;
}

.sort-card.is-dragging {
  cursor: grabbing;
  box-shadow: 0 18px 40px rgba(25, 25, 25, 0.22);
  transform: rotate(-1deg);
}

.sort-card.is-correct {
  border-color: var(--quiz-green);
  background: var(--quiz-pale-green);
  color: #191919;
}

.sort-card.is-wrong {
  border-color: var(--quiz-dark-red);
  background: var(--quiz-pale-red);
  color: #191919;
}

.sort-slot {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.46);
  border: 2px dashed rgba(25, 25, 25, 0.18);
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

body.theme-dark .sort-slot {
  background: rgba(255, 255, 255, 0.05);
}

.sort-slot.is-drop-target {
  border: 2px dashed rgba(227, 0, 69, 0.45);
  background: rgba(227, 0, 69, 0.06);
  box-shadow: inset 0 0 0 2px rgba(227, 0, 69, 0.12);
}

.sort-slot.is-correct {
  border-color: var(--quiz-green);
  background: var(--quiz-pale-green);
  color: #191919;
}

.sort-slot.is-wrong {
  border-color: var(--quiz-dark-red);
  background: var(--quiz-pale-red);
  color: #191919;
}

.sort-slot-number {
  justify-self: center;
  color: var(--accent-text-color);
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
}

.sort-slot-empty {
  color: var(--verdi-grau-1);
  font-family: var(--font-light), var(--font-default), Arial, sans-serif;
  font-size: 0.95rem;
}

.sort-slot > .sort-card {
  grid-column: 2;
  width: 100%;
}

.sort-bank-placeholder {
  border: 2px dashed rgba(227, 0, 69, 0.32);
  background: rgba(227, 0, 69, 0.05);
}

.sort-card-text {
  font-size: 1.08rem;
  line-height: 1.35;
}

.sort-handle,
.sort-card-hint {
  color: var(--verdi-grau-1);
  font-size: 1.1rem;
  line-height: 1;
}

.sort-card-hint {
  grid-column: 2;
}

.sort-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sort-action-button {
  min-height: 48px;
  padding: 0 18px;
  font-size: 1.05rem;
}

.sort-feedback {
  margin: 0;
  color: var(--accent-text-color);
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
  font-size: 1rem;
}

.sort-feedback.is-complete {
  color: var(--quiz-green);
}

.sort-task-box + .content-source {
  margin-top: 0.75rem;
}

.content-box .content-emphasis {
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
}

.quiz-box,
.quiz-result {
  margin-top: 24px;
  padding: 20px;
  border-radius: 12px;
}

.quiz-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 20px;
  background: var(--surface-muted);
  border: 1px solid var(--border-color);
}

.quiz-box-options {
  grid-template-columns: 1fr;
  gap: 16px;
}

.quiz-box .quiz-statement {
  margin: 0;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1.25;
  white-space: pre-wrap;
}

.quiz-box-options .quiz-statement {
  font-size: 1.2rem;
  line-height: 1.35;
}

.quiz-statement strong {
  color: var(--accent-text-color);
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 0;
}

.quiz-box-options .quiz-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  justify-content: stretch;
}

.quiz-box-options .quiz-answer-button {
  min-height: 48px;
  padding: 0 16px;
  font-size: 1.05rem;
}

.quiz-answer-option {
  background: var(--surface-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.quiz-answer-true {
  background: var(--quiz-pale-green);
  color: #191919;
}

.quiz-answer-false {
  background: var(--quiz-pale-red);
  color: #191919;
}

.quiz-answer-button.is-selected {
  outline: 3px solid rgba(25, 25, 25, 0.24);
  outline-offset: 2px;
}

.quiz-answer-button {
  min-height: 44px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 1rem;
}

.quiz-result {
  color: #ffffff;
}

.quiz-result p {
  margin: 0;
  font-family: var(--font-bold), var(--font-default), Arial, sans-serif;
  font-weight: 700;
}

.quiz-result .quiz-source {
  margin-top: 12px;
  font-family: var(--font-light), var(--font-default), Arial, sans-serif;
  font-size: 0.9rem;
  font-weight: 300;
  overflow-wrap: anywhere;
}

.quiz-source a {
  color: inherit;
}

.quiz-result.is-correct {
  background: var(--quiz-green);
}

.quiz-result.is-wrong {
  background: var(--quiz-dark-red);
}

.page-navigation {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
}

.page-navigation.page-navigation-start {
  justify-content: flex-end;
}

.page-navigation-start .next-button {
  margin-left: auto;
}

.page-navigation-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  filter: grayscale(0.25);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.5);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-box {
  width: min(460px, 100%);
  padding: 24px;
  background: var(--surface-color);
  color: var(--text-color);
  border-radius: 12px;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.28);
}

.modal-box h2 {
  margin: 0 0 8px;
}

.modal-box p {
  margin: 0 0 20px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

@media (max-width: 760px) {
  .learning-shell {
    width: min(1120px, 100%);
    padding: 16px 10px;
  }

  .top-bar,
  .progress-panel {
    grid-template-columns: 1fr;
  }

  .top-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .toolbar {
    justify-content: flex-start;
  }

  .button {
    flex: 1 1 auto;
  }

  .quiz-box {
    grid-template-columns: 1fr;
  }

  .quiz-actions {
    justify-content: flex-start;
  }

  .quiz-box-options .quiz-actions {
    grid-template-columns: 1fr;
  }

  .sort-task-box {
    gap: 12px;
    padding: 12px;
  }

  .sort-game {
    grid-template-columns: minmax(220px, 0.9fr) minmax(280px, 1.1fr);
    gap: 12px;
    max-height: 72vh;
    overflow: scroll;
    padding-bottom: 14px;
    scrollbar-width: auto;
  }

  .sort-game::-webkit-scrollbar {
    width: 14px;
    height: 14px;
  }

  .sort-card-bank {
    min-width: 220px;
    gap: 8px;
  }

  .sort-slots {
    min-width: 280px;
    gap: 8px;
  }

  .sort-card,
  .sort-slot,
  .sort-bank-placeholder {
    min-height: 52px;
    border-radius: 8px;
  }

  .sort-card {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    padding: 9px 10px;
  }

  .sort-slot {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 8px;
    padding: 6px 8px;
  }

  .sort-card-text {
    font-size: 0.92rem;
    line-height: 1.25;
  }

  .sort-slot-empty {
    font-size: 0.82rem;
  }

  .sort-handle,
  .sort-card-hint {
    font-size: 0.95rem;
  }

  .sort-action-button {
    min-height: 42px;
    padding: 0 12px;
    font-size: 0.92rem;
  }

  .sort-feedback {
    font-size: 0.9rem;
  }

  .sort-card-hint {
    grid-column: 2;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .content-heading-row {
    flex-direction: column;
  }

}