:root {
  --bg: #f7f6f2;
  --bg2: #ffffff;
  --ink: #1d1f24;
  --ink2: #5b5f69;
  --line: #e2e0d8;
  --accent: #d9522c;
  --accent2: #2f6f8f;
  --ok: #2f8f5b;
  --warn: #c7891b;
  --chest: #d9522c;
  --falsetto: #2f6f8f;
  --radius: 12px;
  --max: 720px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15171c; --bg2: #1f2229; --ink: #ecebe6; --ink2: #a7aab3; --line: #2f333c;
    --accent: #ff7a52; --accent2: #6fb3d6; --ok: #5cc98a; --warn: #e3a93c; --chest: #ff7a52; --falsetto: #6fb3d6;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif;
  line-height: 1.7; font-size: 16px;
}
a { color: var(--accent2); }
header.site {
  border-bottom: 1px solid var(--line); background: var(--bg2);
}
header.site .in {
  max-width: var(--max); margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
header.site .brand { font-weight: 700; text-decoration: none; color: var(--ink); font-size: 17px; }
header.site nav a { margin-left: 14px; font-size: 14px; text-decoration: none; }
main { max-width: var(--max); margin: 0 auto; padding: 20px 16px 60px; }
h1 { font-size: 24px; line-height: 1.4; margin: 8px 0 10px; }
h2 { font-size: 19px; margin: 36px 0 10px; padding-left: 10px; border-left: 4px solid var(--accent); line-height: 1.4; }
h3 { font-size: 16px; margin: 20px 0 6px; }
p { margin: 8px 0; }
.lead { color: var(--ink2); font-size: 15px; }
.card { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.btn {
  display: inline-block; border: 1px solid var(--line); background: var(--bg2); color: var(--ink);
  padding: 10px 16px; border-radius: 10px; font-size: 15px; cursor: pointer; font-family: inherit;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 700; }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: default; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.hidden { display: none !important; }
.note-big { font-size: 48px; font-weight: 700; line-height: 1.1; letter-spacing: .02em; min-height: 56px; font-variant-numeric: tabular-nums; }
.note-sub { color: var(--ink2); font-size: 14px; min-height: 22px; }
.cents { height: 6px; background: var(--line); border-radius: 3px; position: relative; margin: 8px 0 14px; }
.cents i { position: absolute; top: -3px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); left: 50%; transform: translateX(-50%); transition: left .08s; }
.cents b { position: absolute; left: 50%; top: -5px; width: 2px; height: 16px; background: var(--ink2); transform: translateX(-1px); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button { border: 0; background: var(--bg2); color: var(--ink); padding: 8px 14px; font-size: 14px; cursor: pointer; font-family: inherit; }
.seg button.on { background: var(--ink); color: var(--bg); }
.seg button.on.chest { background: var(--chest); color: #fff; }
.seg button.on.falsetto { background: var(--falsetto); color: #fff; }
.rangebar { position: relative; height: 54px; margin: 14px 0 6px; }
.rangebar .keys { position: absolute; inset: 0 0 18px 0; display: flex; border-radius: 6px; overflow: hidden; border: 1px solid var(--line); }
.rangebar .keys span { flex: 1; background: var(--bg2); border-right: 1px solid var(--line); }
.rangebar .keys span.black { background: var(--line); }
.rangebar .fill { position: absolute; top: 4px; height: 28px; background: var(--chest); opacity: .45; border-radius: 4px; }
.rangebar .fill.f { background: var(--falsetto); }
.rangebar .cur { position: absolute; top: 0; width: 3px; height: 36px; background: var(--ink); transform: translateX(-1px); }
.rangebar .lab { position: absolute; bottom: 0; font-size: 11px; color: var(--ink2); transform: translateX(-50%); white-space: nowrap; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 12px 0; }
.stats div { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; text-align: center; }
.stats small { display: block; color: var(--ink2); font-size: 12px; }
.stats strong { font-size: 20px; }
.stats .c strong { color: var(--chest); }
.stats .f strong { color: var(--falsetto); }
.hint { font-size: 13px; color: var(--ink2); }
.status { font-size: 14px; min-height: 22px; }
.status.err { color: var(--accent); }
label.sel { display: block; margin: 8px 0; font-size: 14px; }
select, input[type=text] { font-size: 16px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg2); color: var(--ink); font-family: inherit; }
.result-range { font-size: 26px; font-weight: 700; }
.result-range .f { color: var(--falsetto); font-size: 18px; font-weight: 600; }
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0 4px; font-size: 14px; }
.filters label { display: inline-flex; align-items: center; gap: 6px; }
.group-title { display: flex; align-items: baseline; gap: 10px; margin: 24px 0 6px; }
.group-title h3 { margin: 0; }
.group-title .n { color: var(--ink2); font-size: 13px; }
ul.songs { list-style: none; padding: 0; margin: 0; }
ul.songs li { background: var(--bg2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin: 6px 0; display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; align-items: center; }
ul.songs .t { font-weight: 700; }
ul.songs .a { color: var(--ink2); font-size: 13px; }
ul.songs .r { font-size: 13px; color: var(--ink2); grid-column: 1; }
ul.songs .k { grid-column: 2; grid-row: 1 / span 2; text-align: center; min-width: 74px; }
.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 12px; font-weight: 700; white-space: nowrap; }
.badge.orig { background: var(--ok); color: #fff; }
.badge.shift { background: var(--accent2); color: #fff; }
.badge.near { background: var(--warn); color: #fff; }
.badge.fal { background: var(--falsetto); color: #fff; font-weight: 500; margin-left: 4px; }
.more { text-align: center; margin: 10px 0; }
table.songs { width: 100%; border-collapse: collapse; font-size: 14px; }
table.songs th, table.songs td { border-bottom: 1px solid var(--line); padding: 7px 6px; text-align: left; vertical-align: top; }
table.songs th { font-size: 12px; color: var(--ink2); font-weight: 600; cursor: pointer; white-space: nowrap; }
table.songs td.n { white-space: nowrap; }
.faq dt { font-weight: 700; margin-top: 14px; }
.faq dd { margin: 4px 0 0; }
footer.site { border-top: 1px solid var(--line); margin-top: 40px; padding: 20px 16px; font-size: 13px; color: var(--ink2); }
footer.site .in { max-width: var(--max); margin: 0 auto; }
.share { margin-top: 12px; }
textarea.share { width: 100%; font-size: 14px; padding: 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); font-family: inherit; }
@media (max-width: 420px) {
  .note-big { font-size: 40px; }
  .stats strong { font-size: 17px; }
  h1 { font-size: 21px; }
}