:root {
  --bg: #fdfaf5;
  --card: #ffffff;
  --ink: #24303c;
  --muted: #7b8896;
  --line: #e6e0d6;
  --accent: #2f7fd1;
  --focus: #f08324;
  --stress: #1b4f86;
  --beat: #ffd8a8;
  --radius: 14px;
  --tap: 46px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  padding: 0 0 190px;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  -webkit-text-size-adjust: 100%;
}

/* ------------------------------------------------------------------ topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 10px 14px 8px;
  padding-top: max(10px, env(safe-area-inset-top));
}
.topbar-main { display: flex; align-items: center; gap: 8px; }
.topbar h1 { font-size: 1.05rem; margin: 0; flex: 1; }
.tabs { display: flex; gap: 8px; margin-top: 8px; }
.tabs select { flex: 1; }

select, input[type="text"], textarea {
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 10px;
  min-height: var(--tap);
  width: 100%;
}
textarea { min-height: 120px; }

button {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  min-height: var(--tap);
  padding: 0 14px;
}
button:active { transform: scale(0.97); }
.icon-btn { min-width: var(--tap); padding: 0 10px; font-size: 1.15rem; }
.ghost-btn { color: var(--accent); border-color: #cfe0f2; background: #f4f9ff; }
.primary-btn { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 600; }

/* ------------------------------------------------------------------- panels */
.panel {
  margin: 10px 14px;
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 10px;
}
.panel label { display: grid; gap: 6px; font-size: 0.85rem; color: var(--muted); }
.panel label.check { display: flex; align-items: center; gap: 8px; color: var(--ink); }
.panel input[type="checkbox"] { width: 20px; height: 20px; }
.panel input[type="range"] { width: 100%; height: 28px; }
.value { color: var(--ink); font-weight: 600; }
.row { display: flex; gap: 8px; }
.row button { flex: 1; }
.status { margin: 4px 0 0; font-size: 0.8rem; color: var(--muted); min-height: 1.1em; }

/* ---------------------------------------------------------------- sentences */
.sentences { padding: 6px 14px 0; display: grid; gap: 10px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.card.active { border-color: var(--accent); box-shadow: 0 2px 12px rgba(47, 127, 209, 0.14); }
.card-head { display: flex; align-items: baseline; gap: 8px; }
.card-num { color: var(--muted); font-size: 0.8rem; min-width: 1.6em; }
.card-plain { font-size: 0.78rem; color: var(--muted); word-break: break-word; }

.script { margin: 8px 0 0; line-height: 2.5; }
.chunk {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
  padding: 2px 6px;
  margin: 0 2px 4px 0;
  border-radius: 8px;
  background: #f7f4ee;
}
.chunk.speaking { background: #e8f2fd; }
.chunk .arrow { color: var(--accent); font-weight: 700; }
.chunk .pause { color: var(--muted); font-weight: 700; letter-spacing: 1px; }

.w { display: inline-block; position: relative; white-space: nowrap; }
.w .syl { color: var(--ink); }
.w .syl.stressed { color: var(--stress); font-weight: 800; }
.w.stress { color: var(--stress); }
.w.focus .syl.stressed { color: var(--focus); }
.w.weak { color: var(--muted); }
.w.current { background: var(--beat); border-radius: 6px; }
.w .hint {
  display: block;
  font-size: 0.6em;
  color: var(--muted);
  line-height: 1.1;
  text-align: center;
}
.link-mark { color: var(--accent); }

.note { margin: 8px 0 0; font-size: 0.82rem; color: #4b5a68; background: #fbf6ee; border-radius: 10px; padding: 8px 10px; }
.chunk-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chunk-row button { min-height: 38px; font-size: 0.78rem; padding: 0 10px; }
.card-actions { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.card-actions button { flex: 1 1 40%; min-height: 40px; font-size: 0.85rem; }

/* ------------------------------------------------------------------ legend */
.legend { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 16px 0; font-size: 0.72rem; color: var(--muted); }
.lg.stress { color: var(--stress); font-weight: 700; }
.lg.focus { color: var(--focus); font-weight: 700; }

/* ------------------------------------------------------------------ player */
.player {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--line);
  padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
}
.player-modes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.player-modes button { min-height: 40px; font-size: 0.8rem; padding: 0 4px; }
.player-modes button.active { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 700; }
.player-controls { display: flex; gap: 6px; align-items: center; margin-top: 8px; }
.player-controls button { flex: 1; }
.play-btn { flex: 2 !important; background: var(--accent); color: #fff; border-color: var(--accent); font-size: 1.2rem; }

@media (min-width: 720px) {
  body { padding-bottom: 170px; }
  .sentences { grid-template-columns: 1fr; max-width: 860px; margin: 0 auto; }
  .panel { max-width: 860px; margin-inline: auto; }
  .player-controls { max-width: 860px; margin-inline: auto; }
  .player-modes { max-width: 860px; margin-inline: auto; }
  .script { font-size: 1.05rem; }
}