:root {
  --bg: #ffffff;
  --fg: #1f2933;
  --muted: #6b7280;
  --line: #d6dae0;
  --key: #f5f7fa;
  --key-fn: #e8ecf1;
  --accent: #2563eb;
  --accent-soft: #dbe7ff;
  --ok: #059669;
  --warn: #b45309;
  --dot: rgba(220, 38, 38, 0.75);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  overflow-x: hidden;
}

body {
  max-width: 900px;
  margin: 0 auto;
  padding: 8px 12px 24px;
}

button {
  font: inherit;
  font-size: 0.9rem;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--fg);
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { color: #a0a6ae; cursor: not-allowed; }
button.active { background: var(--accent-soft); border-color: var(--accent); }

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
}
.topbar h1 { font-size: 1.15rem; margin: 4px 0; }
.mode-badge {
  font-size: 0.9rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--key-fn);
}
body.mode-gaze .mode-badge, body.mode-mouse .mode-badge { background: var(--accent-soft); }

.status {
  font-size: 0.85rem;
  padding: 6px 10px;
  margin: 6px 0;
  border-radius: 6px;
  background: #f3f4f6;
}
.status.ok { background: #e7f7ef; color: #065f46; }
.status.warn { background: #fff4e5; color: var(--warn); }

.controls, .output-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.output-area { margin-top: 8px; }
#output {
  width: 100%;
  font-size: 1.3rem;
  line-height: 1.5;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  resize: vertical;
  font-family: inherit;
}
.output-actions { margin-top: 4px; justify-content: flex-end; }

.info-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 6px 0;
}
#selInfo { color: var(--fg); font-weight: 600; }

/* キーボード */
.keyboard {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 8px;
  height: min(56vh, 520px);
  min-height: 260px;
  margin: 8px auto 12px;
  user-select: none;
  -webkit-user-select: none;
}

.key {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--key);
  font-size: clamp(1.4rem, 5vw, 2.2rem);
  touch-action: none;
  cursor: pointer;
  overflow: hidden;
  --p: 0;
}
.key.fn { background: var(--key-fn); font-size: clamp(0.9rem, 3vw, 1.2rem); }
.key.pressed { background: var(--accent-soft); }
.key.dwelling { border-color: var(--accent); }
.key.selected { border-color: var(--accent); background: var(--accent-soft); }
.key.flash { background: #d1fae5; transition: background 0s; }

/* ドウェル進捗バー */
.key::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 5px;
  width: calc(var(--p) * 100%);
  background: var(--accent);
}

/* キー上の母音ヒント */
.hint {
  position: absolute;
  font-size: clamp(0.55rem, 1.8vw, 0.75rem);
  color: var(--muted);
  pointer-events: none;
}
.hint.up { top: 3px; left: 50%; transform: translateX(-50%); }
.hint.down { bottom: 6px; left: 50%; transform: translateX(-50%); }
.hint.left { left: 5px; top: 50%; transform: translateY(-50%); }
.hint.right { right: 5px; top: 50%; transform: translateY(-50%); }

/* 母音候補ポップアップ */
.popup { position: absolute; inset: 0; pointer-events: none; z-index: 20; }
.cand {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.96);
  font-size: clamp(1.4rem, 5vw, 2.2rem);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  --p: 0;
}
.cand.empty { background: rgba(243, 244, 246, 0.9); border-style: dashed; border-color: var(--line); }
.cand.hot { background: var(--accent); color: #fff; }
.cand[data-dir="center"]::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 5px;
  width: calc(var(--p) * 100%);
  background: var(--ok);
  border-radius: 0 0 8px 8px;
}

/* 視線ドット */
.gaze-dot {
  position: fixed;
  left: 0; top: 0;
  width: 22px; height: 22px;
  margin: -11px 0 0 -11px;
  border-radius: 50%;
  background: var(--dot);
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.3);
  pointer-events: none;
  z-index: 1000;
}
.gaze-dot.lost { background: rgba(156, 163, 175, 0.6); }

.video-preview {
  position: fixed;
  right: 8px; bottom: 8px;
  width: 160px;
  border-radius: 6px;
  border: 1px solid var(--line);
  transform: scaleX(-1);
  z-index: 50;
  background: #000;
}

/* 設定 */
.settings { font-size: 0.85rem; border-top: 1px solid var(--line); padding-top: 6px; }
.settings summary { cursor: pointer; color: var(--muted); }
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 8px 16px;
  margin-top: 8px;
}
.settings-grid label { display: flex; flex-direction: column; gap: 2px; }
.settings-grid label.check { flex-direction: row; align-items: center; gap: 6px; }
.settings-grid output { color: var(--accent); font-variant-numeric: tabular-nums; }

/* 較正 */
.calib-overlay {
  position: fixed;
  inset: 0;
  background: #fff;
  z-index: 2000;
}
.calib-overlay[hidden] { display: none; }
.calib-msg {
  position: absolute;
  left: 50%; top: 32%;
  transform: translateX(-50%);
  width: min(90vw, 560px);
  text-align: center;
  font-size: 0.95rem;
  color: var(--fg);
  margin: 0;
}
.calib-target {
  position: absolute;
  width: 44px; height: 44px;
  margin: -22px 0 0 -22px;
  padding: 0;
  border-radius: 50%;
  border: 3px solid #fff;
  background: radial-gradient(circle, #fff 0 4px, #dc2626 5px);
  box-shadow: 0 0 0 2px #dc2626;
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse { 50% { transform: scale(0.8); } }
.calib-cancel { position: absolute; left: 50%; bottom: 40%; transform: translateX(-50%); }

@media (max-width: 520px) {
  body { padding: 6px 6px 16px; }
  .topbar h1 { font-size: 1rem; }
  button { font-size: 0.8rem; padding: 5px 7px; }
  .keyboard { gap: 5px; height: 50vh; min-height: 220px; }
  .video-preview { width: 96px; }
}