/* 英語サイトのスタイル。投資サイト（hue 155 の緑）とは独立させ、藍（hue 265）を軸にする。
   正誤は色だけで伝えない。必ず ○× と「正解」「あなたの回答」の文字を併記する。 */

:root {
  --primary-50: oklch(0.97 0.015 265);
  --primary-100: oklch(0.93 0.04 265);
  --primary-200: oklch(0.86 0.07 265);
  --primary-500: oklch(0.55 0.15 265);
  --primary-600: oklch(0.47 0.16 265);
  --primary-700: oklch(0.39 0.14 265);

  --gray-50: oklch(0.985 0.003 265);
  --gray-100: oklch(0.96 0.005 265);
  --gray-200: oklch(0.91 0.007 265);
  --gray-300: oklch(0.84 0.008 265);
  --gray-500: oklch(0.56 0.01 265);
  --gray-600: oklch(0.47 0.01 265);
  --gray-700: oklch(0.38 0.01 265);
  --gray-900: oklch(0.2 0.008 265);

  --correct: oklch(0.5 0.12 160);
  --correct-bg: oklch(0.96 0.03 160);
  --wrong: oklch(0.52 0.17 25);
  --wrong-bg: oklch(0.96 0.025 25);

  --surface: oklch(1 0 0);
  --ground: oklch(0.975 0.006 265);
  --focus: oklch(0.55 0.2 265);
  --radius: 0.75rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--gray-900);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  /* 長い英文や URL で横にはみ出さないように */
  overflow-wrap: anywhere;
}

[lang="en"] {
  overflow-wrap: break-word;
}

a {
  color: var(--primary-600);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 0.25rem;
}

/* 見出しへのフォーカス移動は読み上げのため。枠は出さない */
h1[tabindex="-1"]:focus {
  outline: none;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  padding: 0.5rem 1rem;
  background: var(--surface);
  border-radius: 0.5rem;
  z-index: 10;
}

.skip:focus {
  top: 0.5rem;
}

/* ---------- 共通の枠 ---------- */

.masthead {
  background: var(--surface);
  border-bottom: 1px solid var(--gray-200);
}

.masthead__inner {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
}

.masthead__home {
  color: var(--gray-600);
  text-decoration: none;
}

.masthead__home:hover {
  text-decoration: underline;
}

.masthead__sep {
  color: var(--gray-300);
}

.masthead__brand {
  color: var(--primary-700);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.app {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

.app:focus {
  outline: none;
}

h1,
h2,
h3 {
  line-height: 1.4;
  margin: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.875rem;
  padding: 0.625rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.button--primary {
  background: var(--primary-600);
  color: var(--surface);
}

.button--primary:hover {
  background: var(--primary-700);
}

.button--secondary {
  background: var(--surface);
  color: var(--primary-700);
  border-color: var(--primary-200);
}

.button--secondary:hover {
  background: var(--primary-50);
}

.notice {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
}

.notice__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.notice__text {
  margin: 0 0 1rem;
  color: var(--gray-700);
}

.notice__actions,
.result__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}

.tag {
  display: inline-block;
  padding: 0 0.5rem;
  border-radius: 999px;
  background: var(--primary-100);
  color: var(--primary-700);
  font-size: 0.8125rem;
  font-weight: 600;
}

/* ---------- ホーム ---------- */

.hero {
  padding: 0.5rem 0 2rem;
}

.hero__eyebrow {
  margin: 0 0 0.5rem;
  color: var(--primary-600);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
}

.hero__title {
  font-size: clamp(1.5rem, 5vw, 2rem);
  letter-spacing: 0.01em;
}

.hero__lead {
  margin: 1rem 0 0;
  color: var(--gray-700);
}

.hero__action {
  margin: 1.5rem 0 0;
}

.categories {
  display: grid;
  gap: 1.25rem;
}

.category {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.category__title {
  font-size: 1.125rem;
}

.category__desc {
  margin: 0.25rem 0 1rem;
  color: var(--gray-600);
  font-size: 0.9375rem;
}

.category__empty {
  margin: 0;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  background: var(--gray-100);
  color: var(--gray-600);
  font-size: 0.9375rem;
}

.lesson-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.lesson-card__link {
  display: grid;
  gap: 0.25rem;
  padding: 1rem;
  border: 1px solid var(--primary-200);
  border-radius: 0.625rem;
  background: var(--primary-50);
  color: inherit;
  text-decoration: none;
}

.lesson-card__link:hover {
  border-color: var(--primary-500);
}

.lesson-card__title {
  font-weight: 700;
  color: var(--primary-700);
}

.lesson-card__summary {
  color: var(--gray-700);
  font-size: 0.9375rem;
}

.lesson-card__status {
  color: var(--gray-600);
  font-size: 0.8125rem;
}

/* ---------- 設問 ---------- */

.lesson-bar {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.lesson-bar__back {
  justify-self: start;
  font-size: 0.9375rem;
}

.lesson-bar__title {
  margin: 0;
  font-weight: 600;
}

.lesson-bar__progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--gray-600);
}

.lesson-bar__progress progress {
  flex: 1;
  min-width: 0;
  height: 0.5rem;
  accent-color: var(--primary-500);
}

.scene {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.scene__kind {
  margin: 0 0 0.25rem;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--gray-600);
  letter-spacing: 0.06em;
}

.scene__kind--reuse {
  color: var(--primary-600);
}

.scene__title {
  font-size: 1.25rem;
}

.scene__setup {
  margin: 0.5rem 0 0;
  color: var(--gray-700);
}

.dialogue {
  margin-top: 1rem;
  display: grid;
  gap: 0.5rem;
}

.dialogue__line {
  margin: 0;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--primary-200);
  background: var(--gray-50);
  border-radius: 0 0.5rem 0.5rem 0;
  display: grid;
}

.dialogue__speaker {
  font-size: 0.8125rem;
  color: var(--gray-600);
  font-weight: 600;
}

.dialogue__text {
  font-size: 1.0625rem;
  font-weight: 500;
}

.question__set {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.question__legend {
  padding: 0;
  margin-bottom: 0.75rem;
  font-weight: 700;
  font-size: 1.0625rem;
}

.choices {
  display: grid;
  gap: 0.625rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.choice {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background: var(--surface);
  border: 1px solid var(--gray-300);
  border-radius: 0.625rem;
}

label.choice {
  cursor: pointer;
}

label.choice:hover {
  border-color: var(--primary-500);
}

/* ラジオ本体は見えなくするが、キーボード操作と読み上げには残す */
.choice__input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  margin: 0;
}

label.choice:has(.choice__input:checked) {
  border-color: var(--primary-600);
  background: var(--primary-50);
  box-shadow: inset 0 0 0 1px var(--primary-600);
}

label.choice:has(.choice__input:focus-visible) {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.choice__mark {
  flex: none;
  width: 1.75rem;
  height: 1.75rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  border: 1px solid var(--gray-300);
  background: var(--gray-50);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--gray-700);
  line-height: 1;
}

label.choice:has(.choice__input:checked) .choice__mark {
  background: var(--primary-600);
  border-color: var(--primary-600);
  color: var(--surface);
}

.choice__text {
  font-size: 1.0625rem;
  line-height: 1.6;
  padding-top: 0.0625rem;
}

.hint {
  margin-top: 1rem;
}

.hint__summary {
  display: inline-block;
  cursor: pointer;
  color: var(--primary-600);
  font-size: 0.9375rem;
  font-weight: 600;
}

.hint__body {
  margin: 0.5rem 0 0;
  padding: 0.75rem 1rem;
  background: var(--primary-50);
  border-radius: 0.5rem;
  color: var(--gray-700);
  font-size: 0.9375rem;
}

.form-error {
  margin: 0.75rem 0 0;
  color: var(--wrong);
  font-weight: 600;
}

.form-error:empty {
  display: none;
}

.question__actions {
  margin: 1.25rem 0 0;
}

.question__actions .button {
  width: 100%;
}

/* ---------- フィードバック ---------- */

.feedback {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-top: 4px solid var(--correct);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.feedback--wrong {
  border-top-color: var(--wrong);
}

.verdict {
  font-size: 1.375rem;
  color: var(--correct);
}

.feedback--wrong .verdict {
  color: var(--wrong);
}

.verdict:focus {
  outline: none;
}

.verdict:focus-visible {
  outline: 3px solid var(--focus);
}

.verdict__icon {
  margin-right: 0.375rem;
}

.feedback__answer {
  margin: 0.5rem 0 0;
  font-weight: 600;
}

.feedback__explanation {
  margin: 0.75rem 0 0;
}

.point,
.reuse-note {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  background: var(--primary-50);
}

.point__label,
.reuse-note__label {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--primary-700);
}

.point__text {
  margin: 0;
  font-weight: 600;
}

.reuse-note ul {
  margin: 0.25rem 0 0;
  padding-left: 1.25rem;
}

.feedback__subtitle {
  margin: 1.5rem 0 0.75rem;
  font-size: 1rem;
}

.choices--answered .choice {
  border-color: var(--gray-200);
}

.choice--correct {
  background: var(--correct-bg);
  border-color: var(--correct) !important;
}

.choice--correct .choice__mark {
  background: var(--correct);
  border-color: var(--correct);
  color: var(--surface);
}

.choice--wrong {
  background: var(--wrong-bg);
  border-color: var(--wrong) !important;
}

.choice--wrong .choice__mark {
  background: var(--wrong);
  border-color: var(--wrong);
  color: var(--surface);
}

.choice__body {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
}

.choice__labels {
  font-size: 0.8125rem;
  font-weight: 700;
}

.choice--correct .choice__labels {
  color: var(--correct);
}

.choice--wrong .choice__labels {
  color: var(--wrong);
}

.choice__note {
  font-size: 0.9375rem;
  color: var(--gray-700);
}

/* ---------- 結果 ---------- */

.result {
  display: grid;
  gap: 1.25rem;
}

.result .lesson-bar__back {
  justify-self: start;
}

.score,
.takeaways,
.review-wrap {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.score__lesson {
  margin: 0 0 0.25rem;
  color: var(--gray-600);
  font-size: 0.9375rem;
}

.score__title {
  font-size: 1.75rem;
  color: var(--primary-700);
}

.score__message {
  margin: 0.5rem 0 0;
}

.takeaways h2,
.review-wrap h2 {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.takeaways ul {
  margin: 0;
  padding-left: 1.25rem;
}

.review {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.review__item {
  padding: 0.875rem 1rem;
  border-radius: 0.625rem;
  border-left: 4px solid var(--correct);
  background: var(--gray-50);
}

.review__item--wrong {
  border-left-color: var(--wrong);
}

.review__head {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
}

.review__verdict {
  font-weight: 700;
  color: var(--correct);
}

.review__item--wrong .review__verdict {
  color: var(--wrong);
}

.review__scene {
  font-weight: 600;
}

.review__detail {
  margin: 0.5rem 0 0;
  display: grid;
  gap: 0.125rem 0.75rem;
  font-size: 0.9375rem;
}

.review__detail dt {
  color: var(--gray-600);
  font-size: 0.8125rem;
}

.review__detail dd {
  margin: 0 0 0.375rem;
}

@media (min-width: 40rem) {
  .app {
    padding-top: 2.5rem;
  }

  .question__actions .button {
    width: auto;
  }

  .review__detail {
    grid-template-columns: 7rem 1fr;
  }

  .review__detail dd {
    margin: 0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .button,
  .choice,
  .lesson-card__link {
    transition: background-color 0.15s, border-color 0.15s;
  }
}