:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #68717a;
  --paper: #f6f1e8;
  --paper-strong: #fffdf8;
  --desk: #15232b;
  --desk-soft: #21343e;
  --line: rgb(23 32 42 / 14%);
  --strategy: #df6d55;
  --strategy-soft: #f7d9cf;
  --management: #218d88;
  --management-soft: #c9e6df;
  --technology: #655ba8;
  --technology-soft: #dcd8ef;
  --yellow: #f1c75b;
  --shadow: 0 1.3rem 3.8rem rgb(7 17 22 / 24%);
  font-family:
    Inter,
    "BIZ UDPGothic",
    "Yu Gothic UI",
    Meiryo,
    system-ui,
    -apple-system,
    sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  background: #0f1b21;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 15%, rgb(48 86 96 / 28%), transparent 28rem),
    linear-gradient(145deg, #102027, #0d171d 65%);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

.skip-link {
  position: fixed;
  z-index: 30;
  padding: 0.7rem 1rem;
  color: #111;
  background: var(--yellow);
  border-radius: 0.4rem;
  transform: translateY(-130%);
}

.skip-link:focus {
  transform: translateY(0.5rem);
}

.site-header,
main,
footer {
  width: min(100% - 2rem, 92rem);
  margin-inline: auto;
}

.site-header,
footer {
  display: flex;
  min-height: 4.4rem;
  align-items: center;
}

.site-header {
  justify-content: space-between;
  color: #e9eee9;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: inherit;
  font-size: 0.84rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-grid {
  display: grid;
  width: 1.35rem;
  height: 1.35rem;
  padding: 0.12rem;
  grid-template-columns: 1fr 1fr;
  gap: 0.12rem;
  background: #f5efe2;
  border-radius: 0.25rem;
  transform: rotate(-3deg);
}

.brand-grid i:nth-child(1) {
  background: var(--strategy);
}

.brand-grid i:nth-child(2) {
  background: var(--management);
}

.brand-grid i:nth-child(3) {
  background: var(--technology);
}

.brand-grid i:nth-child(4) {
  background: var(--yellow);
}

.brand-grid i {
  border-radius: 0.05rem;
}

nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

nav a {
  color: inherit;
  font-size: 0.68rem;
  font-weight: 800;
  text-underline-offset: 0.22rem;
}

.study-shell {
  padding: 0.8rem 0 4.5rem;
}

.study-heading {
  display: flex;
  padding: 1.2rem 1.4rem;
  align-items: end;
  justify-content: space-between;
  gap: 1.2rem;
  color: #e9eee9;
}

.study-heading p,
.sheet-number {
  margin: 0 0 0.35rem;
  color: #92a5ac;
  font-size: 0.56rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.study-heading h1 {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 1.8rem);
  letter-spacing: -0.03em;
}

.domain-key {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.75rem;
}

.domain-key span {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  color: #c6d0d3;
  font-size: 0.58rem;
  font-weight: 800;
}

.domain-key i {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 0.14rem;
}

.domain-key-strategy i {
  background: var(--strategy);
}

.domain-key-management i {
  background: var(--management);
}

.domain-key-technology i {
  background: var(--technology);
}

.study-desk {
  display: grid;
  min-height: 42rem;
  overflow: hidden;
  grid-template-columns: minmax(16rem, 0.85fr) minmax(25rem, 1.65fr) minmax(15rem, 0.78fr);
  background: var(--paper);
  border: 1px solid rgb(255 255 255 / 16%);
  border-radius: 0.95rem;
  box-shadow: var(--shadow);
}

.map-panel,
.question-panel,
.route-panel {
  min-width: 0;
  padding: clamp(1rem, 2.3vw, 2rem);
}

.map-panel {
  background:
    linear-gradient(rgb(23 32 42 / 3%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(23 32 42 / 3%) 1px, transparent 1px), #eee9df;
  background-size: 1.25rem 1.25rem;
  border-right: 1px solid var(--line);
}

.panel-label {
  display: flex;
  min-height: 2.4rem;
  margin-bottom: 1rem;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.7rem;
}

.panel-label span,
.panel-label strong {
  display: block;
}

.panel-label span {
  margin-bottom: 0.18rem;
  color: #778087;
  font-size: 0.52rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.panel-label strong {
  font-size: 0.7rem;
}

.quiet-button {
  padding: 0.15rem;
  color: #687178;
  background: none;
  border: 0;
  font-size: 0.56rem;
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 0.18rem;
}

.topic-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.topic-tile {
  position: relative;
  min-height: 6.4rem;
  padding: 0.7rem;
  overflow: hidden;
  background: rgb(255 253 248 / 84%);
  border: 1px solid rgb(23 32 42 / 9%);
  border-radius: 0.55rem;
  box-shadow: 0 0.35rem 0.8rem rgb(20 31 37 / 5%);
}

.topic-tile::before {
  position: absolute;
  width: 0.35rem;
  inset: 0 auto 0 0;
  content: "";
}

.topic-strategy::before,
.weak-strategy span {
  background: var(--strategy);
}

.topic-management::before,
.weak-management span {
  background: var(--management);
}

.topic-technology::before,
.weak-technology span {
  background: var(--technology);
}

.topic-tile span,
.topic-tile strong,
.topic-tile em {
  display: block;
}

.topic-tile span {
  color: #8a8f8f;
  font-size: 0.43rem;
  font-weight: 800;
}

.topic-tile strong {
  min-height: 2.25rem;
  margin-top: 0.24rem;
  font-size: 0.62rem;
  line-height: 1.45;
}

.topic-tile em {
  margin-top: 0.36rem;
  color: #70787b;
  font-size: 0.56rem;
  font-style: normal;
  font-weight: 900;
}

.topic-meter {
  height: 0.3rem;
  margin-top: 0.4rem;
  overflow: hidden;
  background: #e3ded4;
  border-radius: 999px;
}

.topic-meter i {
  display: block;
  width: 0;
  height: 100%;
  background: #a6adb0;
  border-radius: inherit;
  transition: width 260ms ease;
}

.topic-tile.is-weak .topic-meter i {
  background: #dd6b5b;
}

.topic-tile.is-growing .topic-meter i {
  background: #dfa928;
}

.topic-tile.is-strong .topic-meter i {
  background: #299470;
}

.map-legend {
  display: flex;
  margin-top: 1rem;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.map-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  color: #737b7e;
  font-size: 0.48rem;
  font-weight: 800;
}

.map-legend i {
  width: 0.48rem;
  height: 0.22rem;
  border-radius: 999px;
}

.legend-weak {
  background: #dd6b5b;
}

.legend-growing {
  background: #dfa928;
}

.legend-strong {
  background: #299470;
}

.question-panel {
  position: relative;
  display: grid;
  align-items: center;
  background:
    linear-gradient(
      90deg,
      transparent 2.7rem,
      rgb(216 102 84 / 16%) 2.7rem 2.78rem,
      transparent 2.78rem
    ),
    repeating-linear-gradient(transparent, transparent 2.15rem, rgb(50 72 82 / 8%) 2.15rem 2.2rem),
    var(--paper-strong);
}

.start-sheet,
.quiz-sheet,
.result-sheet {
  width: min(100%, 38rem);
  margin: auto;
  padding: clamp(1rem, 3vw, 2rem);
}

.start-sheet {
  display: grid;
  grid-template-columns: 7rem 1fr;
  align-items: center;
  gap: 1.2rem;
}

.answer-grid-preview {
  display: grid;
  width: 7rem;
  aspect-ratio: 1;
  padding: 1.1rem;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.42rem;
  background: #263a44;
  border-radius: 0.75rem;
  box-shadow: 0.45rem 0.45rem 0 var(--yellow);
  transform: rotate(-2deg);
}

.answer-grid-preview i {
  background: #f8f2e6;
  border-radius: 0.18rem;
}

.answer-grid-preview i.is-marked {
  background: var(--strategy);
}

.start-sheet h2,
.result-sheet h2 {
  margin: 0;
  font-size: clamp(1.2rem, 2.6vw, 1.75rem);
  letter-spacing: -0.04em;
}

.start-sheet p,
.result-sheet p {
  margin: 0.55rem 0 0;
  color: #5f696e;
  font-size: 0.76rem;
  line-height: 1.75;
}

.primary-button,
.secondary-button,
.next-button {
  min-height: 3.15rem;
  border-radius: 0.55rem;
  font-size: 0.72rem;
  font-weight: 900;
}

.primary-button {
  display: flex;
  grid-column: 1 / -1;
  padding-inline: 1rem;
  align-items: center;
  justify-content: space-between;
  color: #f6f2e9;
  background: #20353f;
  border: 0;
  box-shadow: 0.28rem 0.28rem 0 var(--yellow);
}

.primary-button:disabled {
  color: #777;
  background: #d4d0c8;
  box-shadow: none;
}

.start-sheet small {
  grid-column: 1 / -1;
  color: #7d8588;
  font-size: 0.54rem;
  text-align: center;
}

.quiz-sheet {
  align-self: stretch;
}

.quiz-toolbar {
  display: grid;
  margin-bottom: 1.8rem;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.8rem;
}

.quiz-toolbar span,
.quiz-toolbar strong {
  display: block;
}

.quiz-toolbar span {
  color: #7f8789;
  font-size: 0.48rem;
  font-weight: 800;
}

.quiz-toolbar strong {
  font-size: 0.65rem;
}

.progress-track {
  height: 0.36rem;
  overflow: hidden;
  background: #dedbd3;
  border-radius: 999px;
}

.progress-track i {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--strategy), var(--technology));
  border-radius: inherit;
  transition: width 220ms ease;
}

.question-domain {
  display: inline-flex;
  padding: 0.35rem 0.58rem;
  color: #fff;
  border-radius: 0.32rem;
  font-size: 0.54rem;
  font-weight: 900;
}

.domain-strategy {
  background: var(--strategy);
}

.domain-management {
  background: var(--management);
}

.domain-technology {
  background: var(--technology);
}

.quiz-sheet h2 {
  min-height: 5.8rem;
  margin: 0.75rem 0 1rem;
  font-size: clamp(0.95rem, 2vw, 1.22rem);
  line-height: 1.7;
}

.choice-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.choice-button {
  display: grid;
  min-height: 4.1rem;
  padding: 0.65rem;
  grid-template-columns: 1.65rem 1fr;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  background: rgb(255 255 255 / 76%);
  border: 1px solid rgb(23 32 42 / 14%);
  border-radius: 0.48rem;
  text-align: left;
}

.choice-button > span {
  display: grid;
  width: 1.55rem;
  height: 1.55rem;
  place-items: center;
  color: #687277;
  background: #ece7dc;
  border-radius: 0.28rem;
  font-size: 0.62rem;
  font-weight: 950;
}

.choice-button strong {
  font-size: 0.68rem;
  line-height: 1.55;
}

.choice-button.is-selected {
  border-color: #274650;
  box-shadow: inset 0 0 0 2px #274650;
}

.choice-button.is-correct {
  background: #dcf0e8;
  border-color: #3b987b;
}

.choice-button.is-wrong {
  background: #f8dfd9;
  border-color: #d66555;
}

.answer-note {
  margin-top: 0.75rem;
  padding: 0.8rem;
  background: #ece8de;
  border-left: 0.28rem solid #889598;
  border-radius: 0.35rem;
}

.answer-note strong {
  display: block;
  font-size: 0.68rem;
}

.answer-note p {
  margin: 0.25rem 0 0;
  color: #586267;
  font-size: 0.66rem;
  line-height: 1.65;
}

.answer-correct {
  color: #1c775d;
}

.answer-wrong {
  color: #b84e40;
}

.next-button {
  width: 100%;
  margin-top: 0.8rem;
  color: #fff;
  background: #213740;
  border: 0;
}

.next-button:disabled {
  color: #979b99;
  background: #dad6cd;
}

.result-sheet {
  display: grid;
  grid-template-columns: 6.3rem 1fr;
  gap: 1.2rem;
}

.result-stamp {
  display: grid;
  width: 6rem;
  height: 6rem;
  place-items: center;
  color: #f7f2e8;
  background: var(--technology);
  border: 0.4rem double #f7f2e8;
  border-radius: 50%;
  box-shadow: 0 0 0 0.25rem var(--technology);
  font-size: 1rem;
  font-weight: 950;
  transform: rotate(-5deg);
}

.weak-list {
  display: grid;
  grid-column: 1 / -1;
  margin: 0.8rem 0 0;
  padding: 0;
  gap: 0.42rem;
  list-style: none;
}

.weak-list li {
  display: grid;
  min-height: 2.8rem;
  padding: 0.45rem 0.6rem;
  grid-template-columns: 1.8rem 1fr auto;
  align-items: center;
  gap: 0.6rem;
  background: rgb(255 255 255 / 70%);
  border: 1px solid var(--line);
  border-radius: 0.4rem;
}

.weak-list span {
  display: grid;
  width: 1.55rem;
  height: 1.55rem;
  place-items: center;
  color: #fff;
  border-radius: 0.25rem;
  font-size: 0.5rem;
  font-weight: 900;
}

.weak-list strong,
.weak-list em {
  font-size: 0.66rem;
}

.weak-list em {
  color: #777f81;
  font-style: normal;
  font-weight: 900;
}

.result-actions {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: 1fr auto;
  gap: 0.7rem;
}

.result-actions .primary-button {
  grid-column: auto;
}

.secondary-button {
  padding-inline: 1rem;
  color: #28414b;
  background: transparent;
  border: 1px solid #28414b;
}

.route-panel {
  color: #e7ecea;
  background: var(--desk-soft);
  border-left: 1px solid rgb(255 255 255 / 8%);
}

.route-panel .panel-label span {
  color: #92a4aa;
}

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

.route-list li {
  position: relative;
  display: grid;
  min-height: 4.6rem;
  padding: 0.55rem 0;
  grid-template-columns: 2.1rem 1fr;
  align-items: start;
  gap: 0.65rem;
  opacity: 0.5;
}

.route-list li::after {
  position: absolute;
  width: 1px;
  height: 1.55rem;
  background: rgb(255 255 255 / 24%);
  content: "";
  inset: 2.7rem auto auto 0.94rem;
}

.route-list li:last-child::after {
  display: none;
}

.route-list li.is-current {
  opacity: 1;
}

.route-list > li > span {
  display: grid;
  width: 1.9rem;
  height: 1.9rem;
  place-items: center;
  color: #25343b;
  background: #d3dcda;
  border-radius: 50%;
  font-size: 0.52rem;
  font-weight: 950;
}

.route-list li.is-current > span {
  background: var(--yellow);
}

.route-list strong,
.route-list small {
  display: block;
}

.route-list strong {
  margin-top: 0.1rem;
  font-size: 0.68rem;
}

.route-list small {
  margin-top: 0.25rem;
  color: #9eb0b5;
  font-size: 0.52rem;
  line-height: 1.45;
}

.official-card {
  margin-top: 1rem;
  padding: 1rem;
  color: var(--ink);
  background: var(--yellow);
  border-radius: 0.6rem;
  box-shadow: 0.35rem 0.35rem 0 rgb(5 14 18 / 28%);
  transform: rotate(1deg);
}

.official-card span,
.official-card strong {
  display: block;
}

.official-card > span {
  color: #755f24;
  font-size: 0.5rem;
  font-weight: 900;
}

.official-card strong {
  margin-top: 0.2rem;
  font-size: 0.74rem;
}

.official-card p {
  margin: 0.55rem 0;
  color: #675922;
  font-size: 0.57rem;
  line-height: 1.55;
}

.official-card a {
  color: #25343b;
  font-size: 0.62rem;
  font-weight: 950;
  text-underline-offset: 0.18rem;
}

.source-note {
  max-width: 58rem;
  margin: 0.9rem auto 0;
  color: #8fa0a6;
  font-size: 0.58rem;
  line-height: 1.7;
  text-align: center;
}

.prose {
  max-width: 48rem;
  margin: 2rem auto 5rem;
  padding: clamp(1.4rem, 4vw, 2.8rem);
  color: #263137;
  background: var(--paper);
  border-radius: 0.9rem;
  box-shadow: var(--shadow);
}

.prose h1 {
  margin: 0 0 1.8rem;
  font-size: 1.35rem;
}

.prose h2 {
  font-size: 0.88rem;
}

.prose section + section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.prose p {
  color: #566167;
  font-size: 0.8rem;
  line-height: 1.85;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--strategy) !important;
  font-size: 0.58rem !important;
  font-weight: 900;
  letter-spacing: 0.15em;
}

.text-link {
  color: #176c70;
  font-weight: 850;
}

footer {
  justify-content: space-between;
  color: #9fadb1;
  border-top: 1px solid rgb(255 255 255 / 11%);
  font-size: 0.68rem;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 68rem) {
  .study-desk {
    grid-template-columns: minmax(15rem, 0.8fr) minmax(25rem, 1.3fr);
  }

  .route-panel {
    display: grid;
    grid-column: 1 / -1;
    grid-template-columns: auto 1fr minmax(15rem, 0.6fr);
    align-items: center;
    gap: 1.2rem;
    border-top: 1px solid rgb(255 255 255 / 8%);
    border-left: 0;
  }

  .route-panel .panel-label {
    margin: 0;
  }

  .route-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .route-list li {
    min-height: auto;
  }

  .route-list li::after {
    width: 1.8rem;
    height: 1px;
    inset: 1.5rem -0.3rem auto auto;
  }

  .official-card {
    margin: 0;
  }
}

@media (max-width: 48rem) {
  .site-header,
  main,
  footer {
    width: min(100% - 0.8rem, 92rem);
  }

  .study-heading {
    padding-inline: 0.5rem;
    align-items: flex-start;
    flex-direction: column;
  }

  .domain-key {
    justify-content: flex-start;
  }

  .study-desk {
    grid-template-columns: 1fr;
  }

  .map-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .question-panel {
    min-height: 0;
    padding-block: 1.2rem;
  }

  .route-panel {
    display: block;
  }

  .route-panel .panel-label {
    margin-bottom: 1rem;
  }

  .official-card {
    margin-top: 1rem;
  }
}

@media (max-width: 34rem) {
  .site-header nav a:first-child {
    display: none;
  }

  .topic-map {
    grid-template-columns: repeat(3, minmax(5.3rem, 1fr));
    overflow-x: auto;
  }

  .topic-tile {
    min-height: 5.6rem;
    padding: 0.55rem;
  }

  .start-sheet,
  .result-sheet {
    grid-template-columns: 1fr;
  }

  .start-sheet {
    gap: 0.8rem;
    padding-block: 0.5rem;
  }

  .answer-grid-preview {
    width: 5.8rem;
  }

  .choice-list {
    grid-template-columns: 1fr;
  }

  .quiz-sheet h2 {
    min-height: auto;
  }

  .result-stamp {
    width: 5rem;
    height: 5rem;
  }

  .result-actions {
    grid-template-columns: 1fr;
  }

  .result-actions .primary-button {
    grid-column: auto;
  }

  .route-list {
    grid-template-columns: 1fr;
  }

  .route-list li::after {
    width: 1px;
    height: 1.55rem;
    inset: 2.7rem auto auto 0.94rem;
  }

  footer {
    padding-block: 1.3rem;
    align-items: flex-start;
    flex-direction: column;
    gap: 0.8rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}