:root {
  color-scheme: dark;
  --indigo: #0b1530;
  --indigo-2: #14264a;
  --indigo-3: #1c3762;
  --paper: #f4e9cc;
  --ink: #eef1f8;
  --muted: #9ba9c2;
  --amber: #eeb557;
  --amber-soft: #ffe0a0;
  --cyan: #69d5dc;
  --emerald: #7bc99d;
  --rose: #d9808d;
  --line: #3b4b69;
  --danger: #d75868;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --sans: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--indigo);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.75;
}

button {
  font: inherit;
  cursor: pointer;
}

a {
  color: inherit;
  text-underline-offset: 0.25em;
}

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 16px;
  transform: translateY(-160%);
  background: #fff;
  color: #000;
}

.skip-link:focus {
  transform: none;
}

.archive-header {
  position: fixed;
  z-index: 40;
  top: 0;
  right: 0;
  left: 0;
  display: grid;
  min-height: 72px;
  padding: 10px 22px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid rgb(255 255 255 / 14%);
  background: rgb(11 21 48 / 91%);
  backdrop-filter: blur(14px);
}

.archive-brand {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.prism-mark {
  position: relative;
  width: 38px;
  height: 42px;
  background: conic-gradient(from 210deg, var(--cyan), var(--amber), var(--rose), var(--cyan));
  clip-path: polygon(50% 0, 100% 82%, 50% 100%, 0 82%);
}

.prism-mark::after {
  position: absolute;
  inset: 4px;
  background: var(--indigo);
  clip-path: inherit;
  content: "";
}

.archive-brand strong,
.archive-brand small {
  display: block;
}

.archive-brand strong {
  font-family: var(--serif);
  letter-spacing: 0.08em;
}

.archive-brand small {
  color: var(--muted);
  font-size: 0.54rem;
  letter-spacing: 0.13em;
}

.archive-header__status {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 0.67rem;
}

.archive-header__status strong {
  color: var(--amber-soft);
}

.archive-header__actions {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 7px;
}

.archive-header button,
.archive-header__actions a,
.screen button {
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid rgb(255 255 255 / 26%);
  background: transparent;
  color: var(--ink);
}

.archive-header__actions a {
  display: inline-flex;
  align-items: center;
}

.archive-header button[aria-pressed="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
}

main {
  padding-top: 72px;
}

.screen {
  min-height: calc(100vh - 72px);
}

.title-screen,
.ending-screen {
  position: relative;
  display: grid;
  overflow: hidden;
  align-items: center;
}

.title-screen > img,
.ending-screen > img,
.title-screen__veil,
.ending-screen__veil {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.title-screen > img,
.ending-screen > img {
  object-fit: cover;
}

.title-screen__veil {
  background:
    linear-gradient(90deg, rgb(5 12 31 / 96%) 0%, rgb(5 12 31 / 75%) 37%, rgb(5 12 31 / 10%) 76%),
    linear-gradient(0deg, rgb(5 12 31 / 62%), transparent 52%);
}

.title-copy,
.ending-copy {
  position: relative;
  z-index: 2;
  width: min(100% - 48px, 1280px);
  margin-inline: auto;
  padding-block: 70px;
}

.archive-label {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.title-copy h1,
.page-heading h1,
.story-panel__content h1,
.ending-copy h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.1em;
  text-shadow: 0 4px 28px rgb(0 0 0 / 50%);
}

.title-copy h1 {
  font-size: clamp(3.6rem, 8vw, 7.5rem);
}

.title-copy > p:not(.archive-label, .keyboard-note) {
  max-width: 39em;
  margin: 24px 0 0;
  color: rgb(238 241 248 / 78%);
  font-family: var(--serif);
  line-height: 2;
}

.title-actions {
  display: flex;
  margin-top: 34px;
  flex-wrap: wrap;
  gap: 9px;
}

.primary-button {
  border-color: var(--amber) !important;
  background: var(--amber) !important;
  color: var(--indigo) !important;
  font-weight: 800;
}

.keyboard-note {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.66rem;
}

.chapter-screen {
  background:
    radial-gradient(circle at 12% 12%, rgb(105 213 220 / 11%), transparent 30%),
    radial-gradient(circle at 88% 80%, rgb(238 181 87 / 10%), transparent 32%),
    var(--indigo);
}

.screen-shell {
  width: min(100% - 48px, 1280px);
  margin-inline: auto;
  padding-block: clamp(50px, 8vw, 96px);
}

.page-heading {
  display: flex;
  margin-bottom: 38px;
  align-items: end;
  justify-content: space-between;
  gap: 22px;
}

.page-heading h1 {
  font-size: clamp(2.8rem, 6vw, 5rem);
}

.page-heading p:not(.archive-label) {
  color: var(--muted);
}

.chapter-map {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.chapter-card {
  position: relative;
  display: flex;
  min-height: 230px;
  padding: 18px;
  align-items: flex-start;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line) !important;
  background: linear-gradient(145deg, rgb(255 255 255 / 4%), transparent), var(--indigo-2) !important;
  text-align: left;
}

.chapter-card::before {
  position: absolute;
  right: -35px;
  bottom: -40px;
  width: 140px;
  height: 180px;
  transform: rotate(15deg);
  border: 1px solid rgb(238 181 87 / 25%);
  border-radius: 50% 50% 10% 10%;
  background: linear-gradient(180deg, rgb(238 181 87 / 8%), transparent);
  content: "";
}

.chapter-card:disabled {
  opacity: 0.44;
  cursor: not-allowed;
}

.chapter-card:not(:disabled):hover {
  border-color: var(--cyan) !important;
  transform: translateY(-2px);
}

.chapter-card__no,
.chapter-card__category,
.chapter-card__title,
.chapter-card__record {
  position: relative;
  z-index: 1;
  display: block;
}

.chapter-card__no {
  color: var(--amber);
  font-family: var(--serif);
  font-size: 1.7rem;
}

.chapter-card__category {
  margin-top: 5px;
  color: var(--cyan);
  font-size: 0.63rem;
  letter-spacing: 0.12em;
}

.chapter-card__title {
  margin-top: auto;
  font-family: var(--serif);
  font-size: 1.05rem;
}

.chapter-card__record {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.66rem;
}

.chapter-card__record.is-complete {
  color: var(--amber-soft);
}

.archive-progress {
  display: grid;
  margin-top: 28px;
  padding: 22px;
  grid-template-columns: 170px 1fr 170px auto;
  align-items: center;
  gap: 22px;
  border: 1px solid var(--line);
  background: var(--indigo-2);
}

.archive-progress span,
.archive-progress strong {
  display: block;
}

.archive-progress span {
  color: var(--muted);
  font-size: 0.68rem;
}

.archive-progress strong {
  font-family: var(--serif);
  font-size: 1.25rem;
}

.archive-progress progress,
.question-progress progress {
  width: 100%;
  height: 9px;
  border: 0;
  background: var(--indigo-3);
}

progress::-webkit-progress-bar {
  background: var(--indigo-3);
}

progress::-webkit-progress-value {
  background: var(--cyan);
}

progress::-moz-progress-bar {
  background: var(--cyan);
}

.quiz-screen {
  display: grid;
  min-height: calc(100vh - 72px);
  grid-template-columns: minmax(380px, 0.42fr) minmax(560px, 0.58fr);
}

.story-panel {
  position: relative;
  min-height: calc(100vh - 72px);
  overflow: hidden;
}

.story-panel__background,
.story-panel__veil {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.story-panel__background {
  object-fit: cover;
  object-position: 35% center;
  filter: saturate(0.72) brightness(0.62);
}

.story-panel__veil {
  background: linear-gradient(0deg, rgb(5 12 31 / 96%) 4%, rgb(5 12 31 / 52%) 62%, rgb(5 12 31 / 26%));
}

.story-panel__content {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 100%;
  padding: clamp(28px, 5vw, 64px);
  flex-direction: column;
  justify-content: flex-end;
}

.back-button {
  position: absolute;
  top: 30px;
  left: clamp(28px, 5vw, 64px);
}

.story-panel__content h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

.story-panel__content > p:not(.archive-label) {
  color: rgb(238 241 248 / 70%);
  font-family: var(--serif);
}

.speaker-card {
  display: grid;
  margin-top: 24px;
  padding: 16px;
  grid-template-columns: 96px 1fr;
  align-items: center;
  gap: 15px;
  border: 1px solid rgb(255 255 255 / 20%);
  background: rgb(11 21 48 / 82%);
  backdrop-filter: blur(10px);
}

.portrait {
  position: relative;
  overflow: hidden;
  width: 96px;
  height: 96px;
  border: 1px solid var(--line);
  background: var(--indigo);
}

.portrait img {
  position: absolute;
  top: 0;
  width: 400%;
  max-width: none;
  height: 100%;
  object-fit: cover;
}

.portrait--aoi-neutral img {
  left: 0;
}

.portrait--aoi-smile img {
  left: -100%;
}

.portrait--aoi-surprised img {
  left: -200%;
}

.portrait--fumi img {
  left: -300%;
}

.speaker-card span {
  color: var(--amber);
  font-size: 0.72rem;
  font-weight: 800;
}

.speaker-card p {
  margin: 5px 0 0;
  font-family: var(--serif);
  font-size: 0.86rem;
}

.chapter-stats {
  display: flex;
  margin-top: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.chapter-stats > span {
  padding: 7px 10px;
  background: rgb(11 21 48 / 85%);
  color: var(--muted);
  font-size: 0.66rem;
}

.chapter-stats strong {
  color: var(--amber-soft);
}

.question-panel {
  display: flex;
  min-width: 0;
  padding: clamp(30px, 5vw, 70px);
  flex-direction: column;
  background:
    radial-gradient(circle at 90% 10%, rgb(105 213 220 / 9%), transparent 30%),
    var(--indigo);
}

.question-progress {
  display: grid;
  grid-template-columns: 130px 1fr auto;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-size: 0.66rem;
  letter-spacing: 0.09em;
}

.question-copy {
  margin-top: clamp(36px, 7vh, 80px);
}

.difficulty {
  display: inline-flex;
  margin: 0;
  padding: 4px 9px;
  background: var(--indigo-3);
  color: var(--cyan);
  font-size: 0.65rem;
}

.question-copy h2 {
  max-width: 26em;
  margin: 18px 0 0;
  font-family: var(--serif);
  font-size: clamp(1.55rem, 3vw, 2.4rem);
  font-weight: 500;
  line-height: 1.7;
}

.question-copy > p:last-child {
  padding: 14px 16px;
  border-left: 3px solid var(--amber);
  background: var(--indigo-2);
  color: var(--muted);
}

.answer-grid {
  display: grid;
  margin-top: 34px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.answer-button {
  position: relative;
  min-height: 104px !important;
  padding: 18px 18px 18px 54px !important;
  border-color: var(--line) !important;
  background: var(--indigo-2) !important;
  color: var(--ink) !important;
  text-align: left;
}

.answer-button span {
  position: absolute;
  top: 18px;
  left: 18px;
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--serif);
}

.answer-button:not(:disabled):hover {
  border-color: var(--cyan) !important;
}

.answer-button:disabled {
  cursor: default;
}

.answer-button.is-correct {
  border-color: var(--emerald) !important;
  background: rgb(123 201 157 / 14%) !important;
}

.answer-button.is-wrong {
  border-color: var(--rose) !important;
  background: rgb(217 128 141 / 12%) !important;
}

.answer-feedback {
  margin-top: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--indigo-2);
}

.feedback-heading {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feedback-heading > span {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid var(--amber);
  color: var(--amber);
  font-family: var(--serif);
}

.feedback-heading h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
}

.answer-feedback > p {
  color: var(--muted);
}

.reference-note {
  font-size: 0.7rem;
}

.answer-feedback button {
  width: 100%;
  margin-top: 8px;
}

.ending-screen__veil {
  background: linear-gradient(90deg, rgb(5 12 31 / 94%) 0%, rgb(5 12 31 / 70%) 44%, rgb(5 12 31 / 18%));
}

.ending-copy {
  margin-inline: auto;
}

.ending-copy h1 {
  font-size: clamp(3rem, 7vw, 6.4rem);
}

.ending-copy > p:not(.archive-label) {
  max-width: 40em;
  color: rgb(238 241 248 / 74%);
  font-family: var(--serif);
  line-height: 2;
}

.ending-copy dl {
  width: min(100%, 520px);
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.ending-copy dl div {
  display: flex;
  padding: 12px 0;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.ending-copy dd {
  margin: 0;
  color: var(--amber-soft);
  font-family: var(--serif);
  font-size: 1.2rem;
}

dialog {
  color: var(--ink);
}

.how-dialog,
.chapter-result,
.confirm-dialog {
  width: min(100% - 40px, 650px);
  padding: 0;
  border: 1px solid var(--line);
  background: var(--indigo-2);
}

dialog::backdrop {
  background: rgb(5 12 31 / 78%);
  backdrop-filter: blur(6px);
}

.how-dialog form,
.confirm-dialog form {
  padding: 30px;
}

.dialog-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.dialog-heading h2,
.result-copy h2,
.confirm-dialog h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 500;
}

.dialog-heading button {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}

.how-dialog ol {
  margin: 26px 0;
  padding: 0;
  list-style: none;
}

.how-dialog li {
  display: grid;
  padding: 14px 0;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  border-bottom: 1px solid var(--line);
}

.how-dialog li > span {
  color: var(--cyan);
  font-family: var(--serif);
}

.how-dialog li p {
  margin: 0;
  color: var(--muted);
}

.how-dialog form > p {
  color: var(--muted);
  font-size: 0.75rem;
}

.how-dialog form > .primary-button {
  width: 100%;
}

.result-prism {
  height: 140px;
  background:
    conic-gradient(from 180deg at 50% 100%, transparent, rgb(105 213 220 / 40%), rgb(238 181 87 / 45%), rgb(217 128 141 / 34%), transparent),
    var(--indigo);
}

.result-copy {
  padding: 30px;
  text-align: center;
}

.result-stars {
  margin: 18px 0;
  color: var(--amber);
  font-size: 2.2rem;
  letter-spacing: 0.2em;
}

.result-copy dl {
  margin: 0;
  border-top: 1px solid var(--line);
}

.result-copy dl div {
  display: flex;
  padding: 10px 0;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.result-copy dd {
  margin: 0;
}

.result-copy > p {
  color: var(--muted);
}

.result-copy > div:last-child,
.confirm-dialog form > div {
  display: flex;
  margin-top: 24px;
  justify-content: center;
  gap: 8px;
}

.result-copy button,
.confirm-dialog button {
  min-height: 44px;
  padding: 8px 15px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}

.danger-button {
  border-color: var(--danger) !important;
  background: var(--danger) !important;
}

.toast {
  position: fixed;
  z-index: 80;
  right: 24px;
  bottom: 24px;
  max-width: min(380px, calc(100% - 48px));
  padding: 14px 18px;
  border: 1px solid var(--cyan);
  background: var(--indigo-2);
  color: var(--cyan);
  box-shadow: 0 16px 40px rgb(0 0 0 / 35%);
}

@media (max-width: 1100px) {
  .archive-header {
    grid-template-columns: 1fr auto;
  }

  .archive-header__status {
    display: none;
  }

  .chapter-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .story-panel {
    min-height: 660px;
  }
}

@media (max-width: 700px) {
  .archive-header {
    min-height: 66px;
    padding-inline: 14px;
  }

  .archive-brand small,
  .archive-header__actions a,
  .archive-header__actions button[data-how-to] {
    display: none;
  }

  main {
    padding-top: 66px;
  }

  .screen {
    min-height: calc(100vh - 66px);
  }

  .title-copy,
  .ending-copy,
  .screen-shell {
    width: min(100% - 32px, 1280px);
  }

  .title-screen > img {
    object-position: 60% center;
  }

  .title-screen__veil {
    background: linear-gradient(0deg, rgb(5 12 31 / 97%) 0%, rgb(5 12 31 / 70%) 58%, rgb(5 12 31 / 12%));
  }

  .title-copy {
    align-self: end;
    padding-bottom: 34px;
  }

  .title-copy h1 {
    font-size: clamp(3rem, 15vw, 4.5rem);
  }

  .page-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .chapter-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .chapter-card {
    min-height: 182px;
  }

  .archive-progress {
    grid-template-columns: 1fr;
  }

  .story-panel {
    min-height: 580px;
  }

  .story-panel__content {
    padding: 24px 18px;
  }

  .back-button {
    top: 18px;
    left: 18px;
  }

  .story-panel__content h1 {
    font-size: 2.5rem;
  }

  .speaker-card {
    grid-template-columns: 76px 1fr;
  }

  .portrait {
    width: 76px;
    height: 76px;
  }

  .question-panel {
    padding: 28px 18px 60px;
  }

  .question-progress {
    grid-template-columns: 1fr auto;
  }

  .question-progress progress {
    grid-row: 2;
    grid-column: 1 / -1;
  }

  .question-copy {
    margin-top: 36px;
  }

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

  .answer-button {
    min-height: 82px !important;
  }

  .ending-copy {
    padding-bottom: 60px;
  }

  .result-copy > div:last-child {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}