:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1d2733;
  --muted: #5d6b7a;
  --border: #dde3e9;
  --accent: #1f7a8c;
  --accent-text: #ffffff;
  --good: #2e8540;
  --fair: #b8860b;
  --poor: #c0392b;
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11171d;
    --surface: #1b232c;
    --text: #e6ebf0;
    --muted: #93a1b0;
    --border: #2c3742;
    --accent: #4fb3c6;
    --accent-text: #0d1a1f;
    --good: #5cc46f;
    --fair: #e0b84a;
    --poor: #ef6f61;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

.app-header {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: env(safe-area-inset-top) 16px 0;
}

h1 { font-size: 1.15rem; margin: 0; padding: 12px 0 4px; }
h2 { font-size: 1rem; margin: 0 0 8px; }
.subtitle { font-size: 0.8rem; font-weight: 400; color: var(--muted); margin-left: 6px; }

.tabs { display: flex; gap: 4px; }
.tabs button {
  flex: 1;
  padding: 10px 4px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: none;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.tabs button[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 16px calc(32px + env(safe-area-inset-bottom));
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.note, .hint { color: var(--muted); font-size: 0.875rem; margin: 0 0 8px; }
.hint { padding: 0 4px; }

/* 再生ボタン */
.play-card { display: flex; align-items: center; gap: 16px; }
.play {
  flex: none;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 0;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
}
.play-icon {
  width: 0;
  height: 0;
  border-left: 20px solid currentColor;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 6px;
}
.play[aria-pressed="true"] .play-icon {
  width: 20px;
  height: 22px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, currentColor 35%, transparent 35% 65%, currentColor 65%);
}
.play-side { flex: 1; min-width: 0; display: grid; gap: 8px; }
.status { font-weight: 600; }
.meter { height: 8px; border-radius: 4px; background: var(--border); overflow: hidden; }
#meter-bar { height: 100%; width: 0; background: var(--accent); transition: width 0.1s linear; }

/* 入力 */
.slider { display: grid; grid-template-columns: 6.5em 1fr 3em; align-items: center; gap: 8px; margin: 6px 0; }
.slider output { text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); font-size: 0.875rem; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.inline { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; }
select {
  font: inherit;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.grow { flex: 1; min-width: 200px; }

.btn {
  font: inherit;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
.btn[aria-pressed="true"] { background: var(--poor); border-color: var(--poor); color: #fff; }
.btn.ghost { background: none; color: var(--muted); border-color: var(--border); font-weight: 400; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* 測定手順 */
.steps { list-style: none; padding: 0; margin: 0 0 12px; counter-reset: step; }
.steps li {
  counter-increment: step;
  border-top: 1px solid var(--border);
  padding: 12px 0;
  display: grid;
  grid-template-columns: 2em 1fr;
  gap: 0 8px;
}
.steps li::before {
  content: counter(step);
  grid-row: span 4;
  width: 1.8em;
  height: 1.8em;
  border-radius: 50%;
  background: var(--border);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
}
.steps li.done::before { content: "✓"; background: var(--good); color: #fff; }
.step-title { font-weight: 600; }
.place { font-size: 0.75rem; padding: 1px 6px; border-radius: 6px; border: 1px solid var(--border); color: var(--muted); margin-right: 6px; }
.step-actions { display: flex; align-items: center; gap: 12px; margin-top: 6px; }
.step-value { font-size: 0.8rem; color: var(--muted); font-variant-numeric: tabular-nums; }
progress { width: 100%; accent-color: var(--accent); }

/* 結果 */
.summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 12px; }
.pi { border-radius: 12px; padding: 12px; border: 2px solid var(--border); }
.pi .label { font-size: 0.8rem; color: var(--muted); }
.pi .value { font-size: 2rem; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1.2; }
.pi .verdict { font-weight: 600; }
.pi.good { border-color: var(--good); } .pi.good .verdict { color: var(--good); }
.pi.fair { border-color: var(--fair); } .pi.fair .verdict { color: var(--fair); }
.pi.poor { border-color: var(--poor); } .pi.poor .verdict { color: var(--poor); }

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.85rem; font-variant-numeric: tabular-nums; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: right; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--muted); font-weight: 600; }

.prose h2 { margin-top: 16px; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: 4px; }