:root {
  --tt-ink: #102d4f;
  --tt-muted: #4f6480;
  --tt-blue: #1165a5;
  --tt-blue-dark: #0d4776;
  --tt-blue-soft: #e8f5ff;
  --tt-gold: #f3b52f;
  --tt-gold-soft: #fff3c9;
  --tt-green: #16845b;
  --tt-green-soft: #eaf9f1;
  --tt-red: #a93226;
  --tt-red-soft: #fff0ed;
  --tt-focus: #8b2f00;
  --tt-line: #b8d6ec;
  --tt-paper: #fffdf8;
  --tt-shadow: 0 18px 42px rgb(44 70 91 / 14%);
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  margin: 0;
  min-width: 0;
  color: var(--tt-ink);
  background:
    radial-gradient(circle at 12% 6%, rgb(255 255 255 / 88%) 0 7rem, transparent 7.1rem),
    radial-gradient(circle at 88% 12%, rgb(255 255 255 / 65%) 0 9rem, transparent 9.1rem),
    linear-gradient(180deg, #dff5ff 0, #fff7df 52%, #f7e5ba 100%);
  font-family: "BIZ UDPGothic", "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

button,
input {
  font: inherit;
}

button,
a,
label {
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

.tt-visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

:where(button, a, input, summary):focus-visible {
  outline: 4px solid var(--tt-focus);
  outline-offset: 3px;
}

.tt-header-action {
  min-height: 42px;
  padding: 0.45rem 0.85rem;
  color: var(--tt-ink);
  background: #fff;
  border: 2px solid var(--tt-line);
  border-radius: 999px;
  font-weight: 800;
  cursor: pointer;
}

.tt-main {
  width: min(100%, 1180px);
  margin-inline: auto;
  padding: clamp(0.55rem, 2vw, 1.4rem);
}

.tt-storage-status {
  width: min(100%, 1020px);
  margin: 0 auto 0.65rem;
  padding: 0.45rem 0.8rem;
  border-radius: 0.75rem;
  text-align: center;
  font-weight: 800;
}

.tt-storage-status {
  color: #743219;
  background: #fff4ea;
  border: 2px solid #d37a4d;
}

.tt-app {
  width: min(100%, 1020px);
  margin-inline: auto;
}

.tt-screen {
  min-width: 0;
  padding: clamp(1rem, 3vw, 2rem);
  background: rgb(255 253 248 / 97%);
  border: 1px solid rgb(108 137 161 / 25%);
  border-radius: clamp(1.15rem, 3vw, 2rem);
  box-shadow: var(--tt-shadow);
}

.tt-hero {
  position: relative;
  padding: clamp(1rem, 3vw, 2.2rem);
  overflow: hidden;
  background: linear-gradient(135deg, #e9f8ff, #fff5cc);
  border: 3px solid #fff;
  border-radius: 1.6rem;
  text-align: center;
}

.tt-eyebrow {
  margin: 0 0 0.2rem;
  color: var(--tt-blue);
  font-weight: 900;
  letter-spacing: 0.08em;
}

.tt-hero h1 {
  margin: 0;
  font-size: clamp(2.25rem, 9vw, 5rem);
  line-height: 1.15;
  letter-spacing: 0.035em;
}

.tt-hero h1 span {
  display: inline-block;
  margin-right: 0.18em;
  color: #fff;
  padding: 0.05em 0.18em;
  background: var(--tt-blue);
  border-radius: 0.24em;
  font-size: 0.46em;
  vertical-align: 0.35em;
  letter-spacing: 0;
}

.tt-hero p:last-of-type {
  max-width: 40rem;
  margin: 0.7rem auto 0;
  color: var(--tt-muted);
  font-weight: 700;
}

.tt-hero-road {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0.2rem;
  margin-top: 1rem;
}

.tt-hero-road span {
  display: grid;
  min-width: 0;
  aspect-ratio: 1.5;
  place-items: center;
  color: var(--tt-ink);
  background: var(--tt-gold);
  border: 2px solid #b77c05;
  border-radius: 0.55rem;
  font-weight: 900;
}

.tt-resume,
.tt-records,
.tt-course-form,
.tt-table-progress {
  margin-top: 1rem;
  padding: clamp(0.9rem, 2.5vw, 1.35rem);
  background: #fff;
  border: 2px solid var(--tt-line);
  border-radius: 1.15rem;
}

.tt-resume {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  justify-content: space-between;
  background: var(--tt-green-soft);
  border-color: #56a984;
}

.tt-resume strong,
.tt-resume span {
  display: block;
}

.tt-inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tt-section-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  align-items: baseline;
  justify-content: space-between;
}

.tt-section-heading h2,
.tt-table-progress h2 {
  margin: 0;
  font-size: clamp(1.25rem, 4vw, 1.65rem);
}

.tt-section-heading span,
.tt-table-progress > p {
  color: var(--tt-muted);
  font-weight: 700;
}

.tt-stat-grid,
.tt-result-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0.85rem 0 0;
}

.tt-stat-grid div,
.tt-result-grid div {
  min-width: 0;
  padding: 0.7rem 0.35rem;
  background: var(--tt-blue-soft);
  border: 1px solid var(--tt-line);
  border-radius: 0.85rem;
  text-align: center;
}

.tt-stat-grid dt,
.tt-result-grid dt {
  color: var(--tt-muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.tt-stat-grid dd,
.tt-result-grid dd {
  margin: 0.1rem 0 0;
  font-size: 1.28rem;
  font-weight: 900;
}

.tt-course-form fieldset {
  min-width: 0;
  padding: 0;
  margin: 0;
  border: 0;
}

.tt-course-form fieldset + fieldset {
  margin-top: 1.25rem;
  padding-top: 1.15rem;
  border-top: 2px solid #deebf4;
}

.tt-course-form legend {
  width: 100%;
  margin-bottom: 0.65rem;
  font-size: clamp(1.2rem, 4vw, 1.55rem);
  font-weight: 900;
}

.tt-mode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
}

.tt-mode-card,
.tt-table-grid label {
  position: relative;
  min-width: 0;
  cursor: pointer;
}

.tt-mode-card input,
.tt-table-grid input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.tt-mode-card > .tt-mode-content,
.tt-table-grid label > span {
  display: flex;
  min-height: 5rem;
  padding: 0.7rem;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--tt-muted);
  background: #fff;
  border: 3px solid var(--tt-line);
  border-radius: 1rem;
  text-align: center;
  font-weight: 700;
}

.tt-mode-card input:checked + .tt-mode-content,
.tt-table-grid input:checked + span {
  color: var(--tt-ink);
  background: var(--tt-gold-soft);
  border-color: #bc7d00;
  box-shadow: inset 0 -4px 0 rgb(188 125 0 / 20%);
}

.tt-mode-card input:focus-visible + .tt-mode-content,
.tt-table-grid input:focus-visible + span {
  outline: 4px solid var(--tt-focus);
  outline-offset: 3px;
}

.tt-mode-title,
.tt-table-grid b {
  color: var(--tt-ink);
  font-size: 1.15rem;
  font-weight: 900;
}

.tt-table-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
}

.tt-table-grid label > span {
  min-height: 4.6rem;
  padding: 0.5rem 0.3rem;
}

.tt-table-grid small {
  display: block;
  font-size: 0.76rem;
}

.tt-empty-review {
  margin-top: 1rem;
  padding: 0.9rem;
  color: #664700;
  background: #fff7d9;
  border: 2px solid #dbb652;
  border-radius: 0.85rem;
  text-align: center;
}

.tt-empty-review p {
  margin: 0.25rem 0 0;
}

.tt-button {
  display: inline-flex;
  min-height: 48px;
  padding: 0.65rem 1rem;
  align-items: center;
  justify-content: center;
  color: var(--tt-ink);
  background: #fff;
  border: 2px solid var(--tt-line);
  border-radius: 0.85rem;
  text-align: center;
  text-decoration: none;
  font-weight: 900;
  cursor: pointer;
}

.tt-button:hover {
  border-color: var(--tt-blue);
}

.tt-button-primary {
  color: #fff;
  background: var(--tt-blue-dark);
  border-color: var(--tt-blue-dark);
  box-shadow: inset 0 -4px 0 rgb(0 0 0 / 22%);
}

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

.tt-button-review {
  color: #5d3c00;
  background: var(--tt-gold-soft);
  border-color: #c68b12;
}

.tt-button:disabled {
  color: #6e7a83;
  background: #e8edf0;
  border-color: #cbd5db;
  box-shadow: none;
  cursor: not-allowed;
}

.tt-start-button {
  width: min(100%, 24rem);
  margin: 1rem auto 0;
  display: flex;
  font-size: 1.2rem;
}

.tt-progress-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
}

.tt-progress-card {
  min-width: 0;
  padding: 0.65rem;
  background: #fffaf0;
  border: 2px solid #ecd58f;
  border-radius: 0.85rem;
}

.tt-progress-card header {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  justify-content: space-between;
  font-weight: 900;
}

.tt-progress-card p {
  margin: 0.35rem 0 0;
  color: #805700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.tt-progress-card small {
  display: block;
  color: var(--tt-muted);
}

.tt-details {
  margin-top: 0.85rem;
  padding: 0.3rem 0;
  border-top: 1px solid var(--tt-line);
}

.tt-details summary {
  min-height: 44px;
  padding: 0.55rem 0.2rem;
  color: var(--tt-blue-dark);
  font-weight: 900;
  cursor: pointer;
}

.tt-details a {
  color: #075b98;
  font-weight: 800;
}

.tt-hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
}

.tt-hud > div {
  min-width: 0;
  padding: 0.55rem 0.25rem;
  color: #fff;
  background: var(--tt-ink);
  border-radius: 0.9rem;
  text-align: center;
}

.tt-hud span,
.tt-hud strong {
  display: block;
}

.tt-hud span {
  font-size: 0.78rem;
  font-weight: 800;
}

.tt-hud strong {
  font-size: clamp(1rem, 3vw, 1.25rem);
}

.tt-hud strong span {
  display: inline;
  font-size: inherit;
}

.tt-road-stage {
  padding: 0.55rem 0;
}

.tt-review-stage {
  display: grid;
  gap: 0.4rem;
  margin: 0.55rem 0;
  padding: 0.7rem 0.9rem;
  color: var(--tt-ink);
  background: var(--tt-gold-soft);
  border: 2px solid #c78c14;
  border-radius: 1rem;
}

.tt-review-stage[hidden] {
  display: none;
}

.tt-review-progress-heading {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  justify-content: space-between;
  font-weight: 800;
}

.tt-review-progress-heading strong {
  font-size: 1.1rem;
}

.tt-review-meter {
  height: 0.9rem;
  overflow: hidden;
  background: #fff;
  border: 1px solid #b78114;
  border-radius: 999px;
}

.tt-review-meter span {
  display: block;
  width: var(--tt-review-progress, 0%);
  height: 100%;
  background: var(--tt-gold);
  transition: width 320ms ease;
}

.tt-review-stage p {
  margin: 0;
  color: var(--tt-muted);
  font-size: 0.82rem;
  font-weight: 800;
  text-align: right;
}

.tt-road-labels {
  display: flex;
  justify-content: space-between;
  color: var(--tt-muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.tt-road {
  position: relative;
  min-height: 5.5rem;
  padding: 1.7rem 3.8rem 0.6rem 0.2rem;
}

.tt-segments {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 0.25rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.tt-segments li {
  height: 1rem;
  background: #d9e6ec;
  border: 1px solid #9eb8c8;
  border-radius: 0.35rem;
}

.tt-segments li.is-complete {
  background: var(--tt-gold);
  border-color: #a66b00;
}

.tt-car {
  position: absolute;
  z-index: 2;
  top: 0.05rem;
  left: clamp(0rem, calc(var(--tt-road-progress, 0) * (100% - 7.4rem) / 10), calc(100% - 7.4rem));
  width: 3.5rem;
  height: auto;
  transition: left 420ms ease;
}

.tt-destination {
  position: absolute;
  top: 0;
  right: 0;
  display: grid;
  width: 3.4rem;
  min-height: 3.4rem;
  place-items: center;
  color: #754e00;
  background: var(--tt-gold-soft);
  border: 2px solid #c78c14;
  border-radius: 50% 50% 0.7rem 0.7rem;
  font-size: 0.7rem;
  line-height: 1.1;
}

.tt-destination span {
  font-size: 1.2rem;
}

.tt-question-card {
  min-width: 0;
  padding: clamp(0.9rem, 3vw, 1.5rem);
  background: #fff;
  border: 3px solid var(--tt-line);
  border-radius: 1.25rem;
}

.tt-question-meta {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  color: var(--tt-muted);
  font-weight: 800;
}

.tt-badge {
  padding: 0.25rem 0.65rem;
  color: #075487;
  background: var(--tt-blue-soft);
  border-radius: 999px;
}

.tt-instruction {
  margin: 0.65rem 0 0;
  color: var(--tt-muted);
  font-weight: 800;
}

#question-title {
  margin: 0.25rem 0 1rem;
  font-size: clamp(2.2rem, 9vw, 4.7rem);
  line-height: 1.2;
  text-align: center;
  letter-spacing: 0.04em;
}

.tt-choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.tt-choice-button {
  position: relative;
  min-height: 4.4rem;
  padding: 0.65rem 2.5rem;
  color: var(--tt-ink);
  background: #f5fbff;
  border: 3px solid #83b9dc;
  border-radius: 1rem;
  font-size: clamp(1.45rem, 5vw, 2rem);
  font-weight: 900;
  cursor: pointer;
}

.tt-choice-button::before {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  color: #fff;
  background: var(--tt-blue-dark);
  border-radius: 50%;
  content: attr(data-number);
  font-size: 0.8rem;
}

.tt-choice-button:hover {
  background: var(--tt-blue-soft);
  border-color: var(--tt-blue);
}

.tt-choice-button.is-correct {
  background: var(--tt-green-soft);
  border-color: var(--tt-green);
}

.tt-choice-button.is-wrong {
  background: var(--tt-red-soft);
  border-color: var(--tt-red);
}

.tt-choice-button:disabled {
  color: #526476;
  cursor: default;
}

.tt-direct-answer {
  width: min(100%, 28rem);
  margin-inline: auto;
}

.tt-answer-display {
  display: grid;
  min-height: 4.4rem;
  margin-bottom: 0.7rem;
  place-items: center;
  color: var(--tt-ink);
  background: #fffdf3;
  border: 3px solid #c99c30;
  border-radius: 1rem;
  font-size: 2.6rem;
  font-weight: 900;
}

.tt-keypad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
}

.tt-keypad button {
  min-height: 3.25rem;
  padding: 0.35rem;
  color: var(--tt-ink);
  background: #f5fbff;
  border: 2px solid #83b9dc;
  border-radius: 0.75rem;
  font-size: 1.35rem;
  font-weight: 900;
  cursor: pointer;
}

.tt-keypad button:hover {
  background: var(--tt-blue-soft);
  border-color: var(--tt-blue);
}

.tt-submit-answer {
  width: 100%;
  margin-top: 0.65rem;
}

.tt-feedback {
  margin-top: 0.85rem;
  padding: clamp(0.85rem, 3vw, 1.25rem);
  background: var(--tt-green-soft);
  border: 3px solid var(--tt-green);
  border-radius: 1rem;
  text-align: center;
}

.tt-feedback.is-wrong {
  background: var(--tt-red-soft);
  border-color: #cf705f;
}

.tt-feedback h3 {
  margin: 0;
  font-size: 1.35rem;
}

.tt-feedback-equation {
  margin: 0.25rem 0;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  font-weight: 900;
}

.tt-feedback p:last-of-type {
  margin-bottom: 0.7rem;
}

.tt-next-button {
  position: sticky;
  z-index: 1;
  bottom: max(0.5rem, env(safe-area-inset-bottom));
  width: min(100%, 20rem);
}

.tt-question-card.is-feedback .tt-choice-grid,
.tt-question-card.is-feedback .tt-direct-answer {
  display: none;
}

.tt-question-card.is-feedback .tt-instruction,
.tt-question-card.is-feedback #question-title {
  display: none;
}

.tt-result {
  text-align: center;
}

.tt-result > h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 3.7rem);
}

.tt-result-scene {
  width: min(100%, 36rem);
  margin: 0.75rem auto;
  overflow: hidden;
  border-radius: 1.1rem;
}

.tt-result-scene img {
  display: block;
  width: 100%;
  height: auto;
}

.tt-result-message {
  font-size: 1.15rem;
  font-weight: 800;
}

.tt-result-list {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: #fff9e9;
  border: 2px solid #e6ca79;
  border-radius: 0.9rem;
}

.tt-result-list h2,
.tt-result-list p {
  margin: 0;
}

.tt-result-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

@media (max-width: 720px) {
  .tt-screen {
    padding: 0.85rem;
    border-radius: 1.15rem;
  }

  .tt-resume {
    align-items: stretch;
    flex-direction: column;
  }

  .tt-mode-grid,
  .tt-progress-grid {
    grid-template-columns: 1fr;
  }

  .tt-mode-card > .tt-mode-content {
    min-height: 4.25rem;
  }

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

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

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

@media (max-width: 440px) {
  .tt-main {
    padding: 0.4rem;
  }

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

  .tt-hero-road {
    gap: 0.1rem;
  }

  .tt-hero-road span {
    border-width: 1px;
    font-size: 0.78rem;
  }

  .tt-table-grid label > span {
    min-height: 4.2rem;
  }

  .tt-choice-button {
    min-height: 4rem;
  }

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

@media (max-width: 350px) {
  .tt-choice-grid {
    grid-template-columns: 1fr;
  }

  .tt-table-grid {
    gap: 0.35rem;
  }

  .tt-table-grid label > span {
    padding-inline: 0.15rem;
  }

  .tt-table-grid b {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}