:root {
  color-scheme: light;
  --paper: #f2ece0;
  --paper-2: #ebe3d2;
  --paper-3: #e3dac5;
  --card: #fbf7ee;
  --ink: #1a241c;
  --ink-2: #3b4a3e;
  --ink-3: #6f7a6f;
  --ink-4: #9aa39a;
  --line: #d8cdb4;
  --line-soft: #e3d9c1;
  --lime: #c8ee3d;
  --lime-deep: #9fc91a;
  --clay: #d2562e;
  --cream: #fff7e4;
  --danger: #6e2817;
  --font-body: "Inter", "Avenir Next", "Segoe UI", sans-serif;
  --font-script: "Caveat", cursive;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
  overscroll-behavior: none;
}

body {
  min-height: 100svh;
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at 15% 10%, rgba(234, 224, 200, 0.9) 0%, transparent 45%),
    radial-gradient(circle at 85% 90%, rgba(232, 222, 195, 0.85) 0%, transparent 50%),
    rgb(228, 217, 191);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(rgba(26, 36, 28, 0.04) 1px, transparent 1px),
    radial-gradient(rgba(26, 36, 28, 0.03) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 2px;
  opacity: 0.7;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  appearance: none;
}

svg {
  display: block;
  width: 1rem;
  height: 1rem;
}

svg path,
svg circle,
svg rect,
svg line,
svg polyline,
svg polygon {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

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

.app-shell {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
}

.turn-screen {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  overflow: hidden;
  overscroll-behavior: none;
}

.app-nav {
  padding: 24px 14px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  gap: 1rem;
}

.home-nav {
  padding-top: 12px;
  gap: 0.55rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.52rem;
  color: var(--ink);
  font-size: clamp(1.28rem, 6vw, 1.62rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  white-space: nowrap;
  min-width: 0;
}

.brand-mark {
  min-height: 2rem;
  padding: 0 0.58rem;
  border-radius: 0.72rem;
  background: var(--ink);
  color: var(--lime);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "Noto Sans JP", var(--font-body);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1;
}

.brand-wordmark .accent {
  color: var(--clay);
}

.icon-btn,
.ctrl-btn,
.dock-btn,
.btn,
.question-item,
.answer-row {
  cursor: pointer;
}

.icon-btn {
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  display: grid;
  place-items: center;
  transition: background 140ms ease, transform 140ms ease;
}

.icon-btn:hover,
.icon-btn:focus-visible,
.btn:hover,
.btn:focus-visible,
.ctrl-btn:hover,
.ctrl-btn:focus-visible,
.dock-btn:hover,
.dock-btn:focus-visible,
.question-item:hover,
.question-item:focus-visible,
.answer-row:hover,
.answer-row:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.icon-btn:hover,
.icon-btn:focus-visible,
.ctrl-btn:hover,
.ctrl-btn:focus-visible,
.dock-btn:hover,
.dock-btn:focus-visible {
  background: var(--paper-3);
}

.content {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 16px 14px 24px;
}

.content::-webkit-scrollbar {
  display: none;
}

.home-content {
  padding-top: 20px;
  padding-bottom: 106px;
}

.question-content {
  padding-top: 14px;
  padding-bottom: 18px;
}

.a-screen {
  height: 100svh;
  overflow: hidden;
}

.answer-content {
  display: flex;
  overflow: hidden;
  padding: 0 14px 154px;
  flex-direction: column;
}

.slogan {
  margin: 0 4px 24px;
  color: var(--ink-2);
  font-family: var(--font-script);
  font-size: clamp(1.2rem, 5.4vw, 1.68rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: 0.005em;
}

.home-section-label,
.q-section-label,
.answers-header .label,
.q-recap-label,
.error-kicker {
  margin: 0 4px 8px;
  color: var(--clay);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.question-list {
  display: flex;
  flex-direction: column;
}

.question-list-empty {
  margin: 0 4px;
  color: var(--ink-3);
  font-size: 0.95rem;
}

.question-item {
  width: 100%;
  padding: 14px 4px;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  background: transparent;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-align: left;
  transition: transform 140ms ease, color 140ms ease;
}

.question-item:last-child {
  border-bottom: 0;
}

.question-item:hover,
.question-item:focus-visible,
.answer-row:hover,
.answer-row:focus-visible {
  color: var(--clay);
}

.q-text {
  flex: 1 1 auto;
  min-width: 0;
  color: inherit;
  font-size: clamp(0.84rem, 3.36vw, 1.295rem);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.q-meta {
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.86rem;
  font-weight: 500;
  white-space: nowrap;
}

.answers-num {
  color: var(--ink);
  font-weight: 700;
}

.q-arrow,
.answer-arrow {
  color: var(--ink-3);
  flex-shrink: 0;
  font-size: 1.8rem;
  line-height: 1;
  transition: transform 140ms ease, color 140ms ease;
}

.question-item:hover .q-arrow,
.question-item:focus-visible .q-arrow,
.answer-row:hover .answer-arrow,
.answer-row:focus-visible .answer-arrow {
  transform: translateX(3px);
  color: var(--ink);
}

.home-cta {
  position: absolute;
  right: 14px;
  bottom: 20px;
  left: 14px;
  z-index: 2;
}

.btn {
  min-height: 3.5rem;
  width: 100%;
  border: 0;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background 140ms ease, transform 140ms ease, opacity 140ms ease;
}

.btn:disabled,
.ctrl-btn:disabled,
.dock-btn:disabled,
.answer-seek-bar:disabled {
  opacity: 0.45;
  cursor: wait;
  transform: none;
}

.btn-primary {
  background: var(--ink);
  color: var(--cream);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.btn-primary:hover,
.btn-primary:focus-visible,
.ctrl-btn.primary:hover,
.ctrl-btn.primary:focus-visible {
  background: #121c15;
}

.q-title,
.q-recap-text {
  margin: 0 4px 16px;
  color: var(--ink-2);
  font-size: clamp(1.24rem, 5.15vw, 1.62rem);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.03em;
}

.video-card {
  position: relative;
  overflow: hidden;
  border-radius: 1.15rem;
  background: #222;
  aspect-ratio: 16 / 10;
}

.video-card iframe,
.video-card > div {
  width: 100%;
  height: 100%;
}

.answer-video-card {
  flex: 0 0 auto;
}

.video-controls {
  margin-top: 12px;
  padding: 0 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ctrl-btn {
  width: 3.5rem;
  height: 3.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  display: grid;
  place-items: center;
  transition: background 140ms ease, transform 140ms ease, opacity 140ms ease;
}

.ctrl-btn.primary {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--cream);
}

.media-toggle {
  position: relative;
}

.media-toggle .glyph-play,
.media-toggle .glyph-pause {
  position: absolute;
  inset: 0;
  margin: auto;
}

.media-toggle .glyph-play {
  width: 0;
  height: 0;
  margin-left: 1.42rem;
  border-top: 0.55rem solid transparent;
  border-bottom: 0.55rem solid transparent;
  border-left: 0.86rem solid currentColor;
}

.media-toggle .glyph-pause {
  width: 1rem;
  height: 1rem;
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.22rem;
}

.media-toggle .glyph-pause span {
  width: 0.23rem;
  height: 1rem;
  border-radius: 999px;
  background: currentColor;
  display: block;
}

.media-toggle.is-playing .glyph-play {
  display: none;
}

.media-toggle.is-playing .glyph-pause {
  display: inline-flex;
}

.answers-header {
  margin: 24px 0 8px;
}

.answer-list {
  display: flex;
  flex-direction: column;
}

.answer-row {
  width: 100%;
  padding: 12px 4px;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  background: transparent;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: left;
  transition: transform 140ms ease, color 140ms ease;
}

.answer-row:last-child {
  border-bottom: 0;
}

.answer-row-top {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.answer-snippet {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  color: inherit;
  font-size: 0.96rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.answer-meta {
  display: flex;
  align-items: center;
  gap: 0.38rem;
  flex-wrap: wrap;
  color: var(--ink-3);
  font-size: 0.72rem;
  font-weight: 600;
}

.answer-meta .channel {
  margin-left: auto;
  color: var(--ink-3);
}

.tag,
.level-tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.28rem;
  padding: 0 0.46rem;
  border-radius: 999px;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.tag {
  background: var(--paper-3);
  color: var(--ink-2);
}

.tag.accent {
  background: var(--ink);
  color: var(--lime);
}

.tag.quality-medium {
  background: #efe0bb;
  color: #715322;
}

.tag.quality-low {
  background: #e9c6b8;
  color: #7b3724;
}

.level-tag.simple {
  background: #d4deab;
  color: #4a5c18;
}

.level-tag.int {
  background: #e8c9a0;
  color: #6b4317;
}

.level-tag.adv {
  background: #e5b0a2;
  color: #6f2e1a;
}

.transcript-block {
  flex: 1 1 auto;
  min-height: 0;
  margin-top: 16px;
  padding: 0 4px 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: var(--line) transparent;
}

.transcript-block::-webkit-scrollbar {
  width: 0.35rem;
}

.transcript-block::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--line);
}

.transcript-line {
  margin: 0 0 18px;
  color: var(--ink-2);
  font-size: 0.98rem;
  font-weight: 400;
  line-height: 1.52;
  letter-spacing: -0.01em;
  transition: color 100ms linear;
}

.transcript-source,
.transcript-translation {
  display: block;
}

.transcript-source {
  color: inherit;
}

.transcript-translation {
  margin-top: 0.28rem;
  color: var(--ink-3);
  font-family: "Noto Sans JP", var(--font-body);
  font-size: 0.86rem;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.transcript-line.is-active {
  color: var(--ink);
  font-weight: 500;
}

.transcript-line.is-active .transcript-translation {
  color: var(--ink-2);
}

.transcript-line.is-future {
  color: var(--ink-4);
}

.transcript-word {
  border-radius: 0.14em;
  padding: 0 0.03em;
  cursor: pointer;
  transition: background 90ms linear, color 90ms linear;
}

.transcript-word.is-active {
  background: var(--lime);
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.a-actions {
  right: 0;
  left: 0;
  z-index: 4;
}

.answer-control-dock {
  position: absolute;
  bottom: 0;
  padding: 14px 14px 18px;
  border-top: 1px solid rgba(216, 205, 180, 0.85);
  border-radius: 1.35rem 1.35rem 0 0;
  background: rgba(242, 236, 224, 0.94);
  backdrop-filter: blur(18px);
}

.answer-timeline {
  display: flex;
  align-items: center;
  gap: 0.72rem;
}

.timecode {
  min-width: 2.55rem;
  color: var(--ink-2);
  font-size: 0.82rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.answer-seek-bar {
  --progress: 0%;
  flex: 1 1 auto;
  min-width: 0;
  height: 1.45rem;
  appearance: none;
  background: transparent;
}

.answer-seek-bar::-webkit-slider-runnable-track {
  height: 0.34rem;
  border-radius: 999px;
  background: linear-gradient(to right, var(--ink-2) 0 var(--progress), rgba(111, 122, 111, 0.25) var(--progress) 100%);
}

.answer-seek-bar::-moz-range-track {
  height: 0.34rem;
  border-radius: 999px;
  background: linear-gradient(to right, var(--ink-2) 0 var(--progress), rgba(111, 122, 111, 0.25) var(--progress) 100%);
}

.answer-seek-bar::-webkit-slider-thumb {
  width: 1.35rem;
  height: 1.35rem;
  margin-top: -0.5rem;
  border: 0;
  border-radius: 50%;
  appearance: none;
  background: var(--ink-2);
}

.answer-seek-bar::-moz-range-thumb {
  width: 1.35rem;
  height: 1.35rem;
  border: 0;
  border-radius: 50%;
  background: var(--ink-2);
}

.a-actions-row {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  align-items: stretch;
  gap: 0.45rem;
}

.dock-btn {
  min-height: 3.35rem;
  padding: 0.38rem 0.28rem;
  border: 1px solid var(--line);
  border-radius: 1.05rem;
  background: rgba(251, 247, 238, 0.72);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: background 140ms ease, transform 140ms ease, opacity 140ms ease;
}

.dock-btn svg {
  width: 1.18rem;
  height: 1.18rem;
}

.dock-btn.play {
  position: relative;
  border-color: var(--ink);
  background: var(--ink);
  color: var(--cream);
}

.dock-btn.next-question {
  background: var(--lime);
  color: var(--ink);
}

.pn-counter {
  margin: 8px 0 0;
  color: var(--ink-2);
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.error-screen {
  background: var(--danger);
  color: var(--cream);
}

.error-screen .icon-btn {
  color: var(--cream);
}

.error-content {
  padding-top: 28px;
}

.error-content h2 {
  margin: 0 4px 0.75rem;
}

.error-content p {
  margin-left: 4px;
  margin-right: 4px;
}

@media (min-width: 760px) {
  .q-title,
  .q-recap-text {
    font-size: 1.72rem;
  }

  .answer-snippet {
    font-size: 1.02rem;
  }
}

@media (max-width: 430px) {
  .app-nav {
    padding-right: 12px;
    padding-left: 12px;
    gap: 0.7rem;
  }

  .icon-btn {
    width: 2.55rem;
    height: 2.55rem;
    flex-shrink: 0;
  }
}