/* 練習楽譜 音源ページ */

:root {
  --bg: #f6f6f4;
  --card: #ffffff;
  --ink: #23242a;
  --ink-sub: #6d6f78;
  --line: #e2e2df;
  --accent: #2f6f5b;
  --accent-soft: #e3efe9;
  --warm: #a8622c;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181b;
    --card: #1f2126;
    --ink: #e8e8e6;
    --ink-sub: #9a9ca4;
    --line: #2e3138;
    --accent: #6fbfa1;
    --accent-soft: #24352f;
    --warm: #d99a63;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 0 3rem;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

.top {
  padding: 1.4rem 1rem 0.8rem;
  max-width: 720px;
  margin: 0 auto;
}
.top h1 { font-size: 1.25rem; margin: 0; letter-spacing: 0.02em; }
.top .sub { margin: 0.2rem 0 0; font-size: 0.8rem; color: var(--ink-sub); }

/* --- 冊子タブ --- */
.tabs {
  display: flex;
  gap: 0.4rem;
  padding: 0.6rem 1rem;
  max-width: 720px;
  margin: 0 auto;
  overflow-x: auto;
}
.tabs button {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-sub);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.tabs button.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

main { max-width: 720px; margin: 0 auto; padding: 0 1rem; }

.loading { color: var(--ink-sub); font-size: 0.9rem; padding: 2rem 0; text-align: center; }

.chapter { margin: 1.4rem 0 2rem; }
.chapter h2 {
  font-size: 0.95rem;
  margin: 0 0 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--line);
  letter-spacing: 0.02em;
}

/* --- トラック --- */
.track {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 0.7rem;
  overflow: hidden;
}
.track.playing { border-color: var(--accent); }

.track-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.85rem;
}

.play {
  flex: 0 0 auto;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 0;
}
.play .tri {
  width: 0; height: 0;
  border-left: 12px solid #fff;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  margin-left: 3px;
}
.track.playing .play .tri {
  border: none;
  width: 12px; height: 13px;
  margin-left: 0;
  background: #fff;
  clip-path: polygon(0 0, 35% 0, 35% 100%, 0 100%, 0 0, 65% 0, 100% 0, 100% 100%, 65% 100%, 65% 0);
}

.track-title { min-width: 0; flex: 1; }
.track-title .label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
}
.track-title .bpm {
  font-size: 0.75rem;
  color: var(--ink-sub);
}

.track-body { padding: 0 0.85rem 0.85rem; }

.bar {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}
.bar .fill {
  height: 100%;
  width: 0;
  background: var(--accent);
}
.pos {
  font-size: 0.72rem;
  color: var(--ink-sub);
  margin-top: 0.25rem;
  font-variant-numeric: tabular-nums;
}

/* --- コントロール --- */
.ctrls { margin-top: 0.6rem; display: grid; gap: 0.4rem; }

.row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 32px;
}
.row .label {
  flex: 0 0 3.2rem;
  font-size: 0.75rem;
  color: var(--ink-sub);
}

.seg { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.seg button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-sub);
  border-radius: 6px;
  padding: 0.22rem 0.6rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}
.seg button.on {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.tempo { display: flex; align-items: center; gap: 0.4rem; }
.tempo-val {
  min-width: 3.2rem;
  text-align: center;
  font-size: 1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.step {
  width: 30px; height: 30px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: 6px;
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.loop { display: flex; align-items: center; gap: 0.35rem; }
.loop input {
  width: 3.2rem;
  padding: 0.2rem 0.3rem;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  border-radius: 6px;
  font: inherit;
  font-size: 0.8rem;
  text-align: center;
  opacity: 0.5;
}
.loop.active input { opacity: 1; }
.loop .sep { font-size: 0.75rem; color: var(--ink-sub); }
.loop-toggle {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-sub);
  border-radius: 6px;
  padding: 0.22rem 0.6rem;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
}
.loop-toggle.on {
  background: var(--warm);
  border-color: var(--warm);
  color: #fff;
}

/* --- メトロノーム --- */
.metronome {
  max-width: 720px;
  margin: 2rem auto 0;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.metronome h2 {
  font-size: 0.9rem;
  margin: 0 0 0.7rem;
}
.met-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}
.met-toggle {
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 8px;
  padding: 0.45rem 1.1rem;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}
.met-toggle.on { background: var(--accent); color: #fff; }

.met-bpm { display: flex; align-items: center; gap: 0.4rem; margin-left: auto; }
.met-value { display: flex; align-items: baseline; gap: 0.25rem; }
.met-value output {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 2.6rem;
  text-align: center;
  display: inline-block;
}
.met-value small { font-size: 0.7rem; color: var(--ink-sub); }

.metronome input[type=range] { width: 100%; margin: 0 0 0.7rem; accent-color: var(--accent); }

.met-beats { display: flex; gap: 0.4rem; }
.met-beats .dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 1px solid var(--line);
}
.met-beats .dot.lit { background: var(--accent); border-color: var(--accent); }

/* --- フッター --- */
.foot {
  max-width: 720px;
  margin: 2rem auto 0;
  padding: 0 1rem;
  font-size: 0.72rem;
  color: var(--ink-sub);
}
.foot p { margin: 0.3rem 0; }
.foot code {
  font-family: Consolas, monospace;
  background: var(--card);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
}