:root {
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans JP", sans-serif;
}

:root {
  --bg: #f5f5f7;
  --text: #16181d;
  --muted: #4f5563;
  --surface: #ffffff;
  --surface-strong: #f2f4f8;
  --border: #d7dbe4;
  --accent: #111;
  --accent-contrast: #fff;
  --status-ok: #0f5132;
  --status-error: #842029;
  --shadow: 0 8px 30px rgba(16, 24, 40, 0.06);
}

:root[data-theme="dark"] {
  --bg: #0f1116;
  --text: #eceff4;
  --muted: #b6bfce;
  --surface: #171a22;
  --surface-strong: #1e2430;
  --border: #323b4b;
  --accent: #e9ecf1;
  --accent-contrast: #0f1116;
  --status-ok: #67d49d;
  --status-error: #ff8d8d;
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 24px;
  background: var(--bg);
  color: var(--text);
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  max-width: 920px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.stageKana {
  margin: 4px 0 0;
  text-align: center;
  font-size: clamp(36px, 9vw, 56px);
  font-weight: 800;
  line-height: 1;
}


.pose {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  align-items: flex-start;
  margin-top: 12px;
}

.pose.mainStage {
  margin-top: 0;
  display: grid;
  justify-items: center;
  gap: 12px;
}

.hand {
  width: min(100%, 420px);
}

.handBox {
  border: 1px solid var(--border);
  background: var(--surface-strong);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.fingers {
  display: flex;
  gap: 10px;
  justify-content: center;
  align-items: flex-end;
  height: 160px;
}

.meta {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.7;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(5, minmax(44px, 1fr));
  gap: 8px;
}

.btn {
  padding: 10px 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
}

.btn.active {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
}

.btn.disabled {
  visibility: hidden;
  pointer-events: none;
}

.optBtn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.kanaBtn {
  display: flex;
  flex-direction: row;
  gap: 6px;
  align-items: center;
  justify-content: center;
  padding: 12px 0;
}

.kanaBtn .kana {
  font-weight: 800;
}

.kanaBtn .num {
  display: none;
  font-size: 12px;
  opacity: 0.7;
}

.details[open] .kanaBtn.active .num {
  display: inline;
}

.details {
  margin-top: 12px;
}

.details summary {
  cursor: pointer;
  user-select: none;
  font-weight: 700;
}

.details[open] summary {
  margin-bottom: 8px;
}

.handSprite {
  width: var(--frame-w, 128px);
  height: var(--frame-h, 128px);
  background-image: url("../img/finger_binary_sprite_sheet.png");
  background-repeat: no-repeat;
  background-size: calc(var(--frame-w, 128px) * 8) calc(var(--frame-h, 128px) * 4);
  image-rendering: pixelated;
}

.handSprite.is-left {
  transform: scaleX(-1);
  transform-origin: center;
}

.sequenceTools {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  font-size: 14px;
  color: var(--muted);
}

#phraseInput {
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--text);
}

.speedField input[type="range"] {
  width: 100%;
}

.sequenceActions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sequenceActions button {
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
}

.sequenceActions button:hover {
  border-color: var(--muted);
}

.sequenceActions button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.sequenceStatus {
  min-height: 1.2em;
  font-size: 14px;
  color: var(--status-ok);
}

.sequenceStatus.error {
  color: var(--status-error);
}


.pageHeader {
  max-width: 920px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.pageHeader h1 {
  margin: 0;
}

.themeToggleBtn {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
}

.themeToggleBtn:hover {
  border-color: var(--muted);
}

@media (max-width: 640px) {
  .pageHeader {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  body {
    margin: 12px;
  }

  h1 {
    margin: 0 0 12px;
    font-size: clamp(30px, 9vw, 42px);
  }

  .card {
    padding: 12px;
  }
}

.optionBar {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
}

.optBtn {
  width: 64px;
  padding: 12px 0;
  font-size: 20px;
}