:root {
  color-scheme: light;
  --bg: #f6f8f4;
  --panel: #ffffff;
  --ink: #1d2a26;
  --muted: #60706a;
  --line: #d9e2dc;
  --primary: #2f7d5c;
  --primary-dark: #225d45;
  --warm: #f2b84b;
  --soft: #eaf5ef;
  --wrong: #fff3df;
  --wrong-ink: #7a4b00;
  --blue: #dcecf7;
  --rose: #f8e3e1;
  --shadow: 0 18px 45px rgba(37, 54, 42, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(150deg, rgba(47, 125, 92, 0.14), transparent 34%),
    linear-gradient(330deg, rgba(242, 184, 75, 0.18), transparent 36%),
    var(--bg);
}

button {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 28px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: stretch;
}

.game-panel,
.status-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.game-panel {
  min-width: 0;
  padding: 26px;
  display: grid;
  gap: 18px;
}

.status-panel {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.title-area {
  display: grid;
  gap: 6px;
}

.eyebrow,
.label {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 800;
}

h1 {
  margin: 0;
  font-size: clamp(1.95rem, 4vw, 3.35rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.settings-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #fbfdf9;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 14px;
}

.setting-group {
  min-width: 0;
  display: grid;
  gap: 9px;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.segmented-control.compact {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.setting-button,
.choice-button,
.sub-button {
  min-height: 54px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 900;
}

.setting-button {
  border: 1px solid #d3dce5;
  background: #eef2f6;
  color: var(--ink);
  font-size: 1rem;
}

.setting-button.selected {
  color: #ffffff;
  background: var(--primary);
  border-color: var(--primary);
}

.picture-card {
  min-height: 300px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbf5 100%);
  display: grid;
  place-items: center;
  gap: 8px;
}

.picture-frame {
  width: min(100%, 440px);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
}

.picture-frame svg,
.picture-image {
  width: 100%;
  height: 100%;
  display: block;
}

.picture-image {
  object-fit: contain;
}

.category-text {
  min-height: 1.4em;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 800;
}

.answer-area {
  display: grid;
  gap: 14px;
}

.question-text {
  margin: 0;
  color: var(--primary-dark);
  font-size: clamp(1.35rem, 2.6vw, 2.05rem);
  line-height: 1.35;
  font-weight: 900;
}

.choices {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.choice-button {
  min-height: 92px;
  padding: 12px;
  border: 2px solid #c7decd;
  background: var(--soft);
  color: var(--primary-dark);
  font-size: clamp(1.45rem, 3vw, 2.25rem);
  line-height: 1.2;
}

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

.choice-button.correct {
  border-color: var(--primary);
  background: #dff2e7;
  color: var(--primary-dark);
}

.choice-button.wrong {
  border-color: #f0c77e;
  background: var(--wrong);
  color: var(--wrong-ink);
}

.control-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
}

.sub-button {
  border: 0;
  color: #ffffff;
  background: var(--primary);
  font-size: 1.15rem;
}

.sub-button:hover,
.sub-button:focus-visible {
  background: var(--primary-dark);
}

.sub-button.quiet {
  border: 1px solid var(--line);
  color: var(--ink);
  background: #ffffff;
}

.sub-button.quiet:hover,
.sub-button.quiet:focus-visible {
  background: #eef2f6;
}

.treasure-panel {
  display: grid;
  gap: 12px;
}

.treasure-box {
  position: relative;
  width: 210px;
  height: 156px;
  margin: 0 auto;
}

.lid,
.box-body {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid #7a4b00;
  background: var(--warm);
}

.lid {
  top: 30px;
  width: 170px;
  height: 48px;
  border-radius: 12px 12px 4px 4px;
  transition: transform 260ms ease, top 260ms ease;
  transform-origin: left bottom;
}

.box-body {
  bottom: 18px;
  width: 190px;
  height: 78px;
  border-radius: 6px 6px 14px 14px;
  box-shadow: inset 0 -18px 0 rgba(122, 75, 0, 0.12);
}

.box-body::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -4px;
  width: 26px;
  height: 82px;
  transform: translateX(-50%);
  background: #f8d573;
  border-left: 4px solid #7a4b00;
  border-right: 4px solid #7a4b00;
}

.treasure-prize {
  position: absolute;
  left: 50%;
  top: 34px;
  transform: translate(-50%, 20px) scale(0.85);
  opacity: 0;
  font-size: 3.6rem;
  transition: transform 260ms ease, opacity 260ms ease;
}

.treasure-box.open .lid {
  top: 8px;
  transform: translateX(-50%) rotate(-10deg);
}

.treasure-box.open .treasure-prize {
  opacity: 1;
  transform: translate(-50%, -6px) scale(1);
}

.star-track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.star {
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: #ffffff;
  color: #bdc4bd;
  font-size: 1.7rem;
}

.star.filled {
  border-color: #e7bb45;
  background: #fff6d8;
  color: #d99800;
}

.treasure-text,
.feedback,
.score-text {
  margin: 0;
}

.treasure-text,
.feedback {
  min-height: 4.2em;
  padding: 14px;
  border-radius: 8px;
  background: #fbfdf9;
  color: var(--muted);
  line-height: 1.5;
  font-weight: 800;
}

.score-text {
  font-size: 1.8rem;
  color: var(--primary-dark);
  font-weight: 900;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .status-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .treasure-panel {
    grid-row: span 2;
  }
}

@media (max-width: 680px) {
  .app-shell {
    width: min(100% - 20px, 1180px);
    padding: 18px 0;
  }

  .game-panel,
  .status-panel {
    padding: 16px;
  }

  .settings-panel,
  .status-panel,
  .choices,
  .control-row {
    grid-template-columns: 1fr;
  }

  .segmented-control,
  .segmented-control.compact {
    grid-template-columns: 1fr;
  }

  .choice-button {
    min-height: 76px;
  }
}

/* LiNest v3: 絵・宝箱・正誤色を保ち、学習カードの外枠を統一する。 */
body.linest-themed {
  --bg: var(--linest-bg);
  --panel: var(--linest-surface);
  --ink: var(--linest-text);
  --muted: var(--linest-muted);
  --line: var(--linest-border);
  --primary: var(--linest-green);
  --primary-dark: var(--linest-green-dark);
  --soft: var(--linest-green-soft);
  --shadow: var(--linest-shadow);
}

body.linest-themed :where(.game-panel, .status-panel, .settings-panel, .picture-card) {
  border-color: var(--linest-border);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--linest-shadow);
}

body.linest-themed .settings-panel {
  background: var(--linest-green-soft);
}

body.linest-themed :where(.setting-button, .sub-button, .star, .treasure-text, .feedback) {
  border-color: var(--linest-border);
  background-color: #ffffff;
  color: var(--linest-text);
}

body.linest-themed .setting-button.selected {
  border-color: var(--linest-green);
  background: var(--linest-green);
  color: #ffffff;
}

body.linest-themed .sub-button.quiet {
  border-color: var(--linest-border) !important;
  background: #ffffff !important;
  color: var(--linest-muted) !important;
}

@media (max-width: 680px) {
  body.linest-themed :where(.setting-button, .choice-button, .sub-button) {
    min-width: 0;
    white-space: normal;
    word-break: keep-all;
  }
}