/* カバー曲データベース。色は :root の変数だけで決め、ダークは2か所（端末設定・手動）に同じ値を書く */
:root {
  --bg: #f6f4ef; --fg: #1b1a22; --muted: #6b6878; --line: #e3dfd6; --card: #ffffff;
  --accent: #d6432f; --accent-ink: #fff; --accent-soft: #fbe5df; --link: #2f4fd6; --bar: #d6432f;
  --chip: #efece5; --chip-on: #1b1a22; --chip-on-ink: #fff; --self: #2c8a5a; --self-soft: #def3e7;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14131a; --fg: #ecebf2; --muted: #9b98aa; --line: #2b2935; --card: #1c1b24;
    --accent: #ff7a5c; --accent-ink: #1b0e0a; --accent-soft: #3a211b; --link: #9db1ff; --bar: #ff7a5c;
    --chip: #262531; --chip-on: #ecebf2; --chip-on-ink: #14131a; --self: #6fd19c; --self-soft: #1c3227;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14131a; --fg: #ecebf2; --muted: #9b98aa; --line: #2b2935; --card: #1c1b24;
  --accent: #ff7a5c; --accent-ink: #1b0e0a; --accent-soft: #3a211b; --link: #9db1ff; --bar: #ff7a5c;
  --chip: #262531; --chip-on: #ecebf2; --chip-on-ink: #14131a; --self: #6fd19c; --self-soft: #1c3227;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.7 system-ui, sans-serif; overflow-wrap: anywhere; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 1040px; margin: 0 auto; padding: 0 16px 32px; }
.muted { color: var(--muted); }
h1, h2 { line-height: 1.35; letter-spacing: .01em; }
h2 { font-size: 1.05rem; margin: 0 0 .7rem; }

/* 上部 */
.top { position: sticky; top: 0; z-index: 5; display: flex; gap: 12px; align-items: center; padding: 10px 16px; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; color: var(--fg); font-weight: 800; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.mark { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--accent); color: var(--accent-ink); font-size: 16px; }
.top .q { flex: 1; max-width: 420px; margin-left: auto; }
.q input { width: 100%; padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--fg); font: inherit; }
.nav { display: flex; gap: 14px; white-space: nowrap; font-size: .9rem; }
.nav a { color: var(--fg); }
@media (max-width: 720px) {
  .top { flex-wrap: wrap; }
  .top .q { order: 3; flex-basis: 100%; max-width: none; }
  .brand span:last-child { font-size: .95rem; }
}
.crumbs { max-width: 1040px; margin: 10px auto 0; padding: 0 16px; font-size: .82rem; color: var(--muted); }

/* トップ */
.hero { padding: 40px 0 24px; }
.hero h1 { font-size: clamp(1.7rem, 5vw, 2.6rem); margin: 0 0 .4rem; font-weight: 900; }
.hero em { font-style: normal; color: var(--accent); }
.lead { color: var(--muted); margin: 0 0 1rem; }
.q.big { display: flex; gap: 8px; max-width: 640px; }
.q.big input { padding: 12px 14px; font-size: 1rem; }
.q.big button { padding: 0 18px; border: 0; border-radius: 10px; background: var(--accent); color: var(--accent-ink); font: inherit; font-weight: 700; cursor: pointer; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; margin: 16px 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.grid2 > .card { margin: 16px 0; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }
.more { margin: .6rem 0 0; font-size: .9rem; }

/* 順位付きの一覧 */
.rank { list-style: none; counter-reset: r; margin: 0; padding: 0; }
.rank li { counter-increment: r; display: grid; grid-template-columns: 2em 1fr auto; grid-template-areas: "n t c" "n o c"; column-gap: 8px; padding: 7px 0; border-top: 1px solid var(--line); }
.rank li:first-child { border-top: 0; }
.rank li::before { content: counter(r); grid-area: n; color: var(--muted); font-variant-numeric: tabular-nums; font-weight: 700; text-align: right; padding-top: 1px; }
.rank .rt { grid-area: t; font-weight: 650; }
.rank .ro { grid-area: o; font-size: .82rem; color: var(--muted); }
.rank .rn { grid-area: c; align-self: center; font-size: .8rem; color: var(--muted); white-space: nowrap; }
.rank .rn b { color: var(--fg); font-size: 1rem; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 1rem; }
.chip { display: inline-flex; gap: 6px; align-items: baseline; padding: 4px 11px; border-radius: 999px; background: var(--chip); color: var(--fg); font-size: .88rem; }
.chip small { color: var(--muted); font-size: .75rem; }
.chip.on { background: var(--chip-on); color: var(--chip-on-ink); }
.chip.off { color: var(--muted); }
.feed { list-style: none; margin: 0; padding: 0; }
.feed li { display: grid; grid-template-columns: 7.5em 1fr; column-gap: 8px; padding: 6px 0; border-top: 1px solid var(--line); font-size: .92rem; }
.feed li:first-child { border-top: 0; }
.feed time { grid-row: span 2; color: var(--muted); font-size: .8rem; padding-top: 2px; }
.feed span { font-size: .82rem; color: var(--muted); }

/* 作品・アーティストの見出し */
.head { padding: 26px 0 6px; }
.kicker { margin: 0; font-size: .8rem; font-weight: 700; color: var(--accent); letter-spacing: .08em; }
.head h1 { font-size: clamp(1.6rem, 4.6vw, 2.4rem); margin: .1rem 0 .3rem; font-weight: 900; }
.dis { font-size: .55em; font-weight: 500; color: var(--muted); }
.aka { margin: 0; color: var(--muted); font-size: .88rem; }
.orig { margin: .5rem 0 0; font-size: 1.05rem; }
.people { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: .3rem 0 0; font-size: .9rem; }
.people b { color: var(--muted); font-weight: 600; margin-right: 4px; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin: 16px 0; }
.stats div { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; }
.stats b { display: block; font-size: 1.6rem; font-weight: 900; font-variant-numeric: tabular-nums; line-height: 1.2; }
.stats span { font-size: .8rem; color: var(--muted); }

/* 年代の棒グラフ */
.bars { display: flex; align-items: flex-end; gap: 6px; height: 120px; padding: 8px 4px 0; margin: 0 0 8px; overflow-x: auto; }
.bar { flex: 1 0 28px; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; }
.bar span { display: block; width: 100%; max-width: 44px; min-height: 3px; background: var(--bar); border-radius: 4px 4px 0 0; }
.bar b { font-size: .72rem; order: -1; color: var(--muted); }
.bar small { font-size: .7rem; color: var(--muted); margin-top: 2px; }

/* カバーの表 */
.listhead { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; margin-bottom: .4rem; }
.listhead h2 { margin: 0; }
.filter { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.filter button { padding: 4px 12px; border: 0; background: transparent; color: var(--fg); font: inherit; font-size: .85rem; cursor: pointer; }
.filter button[aria-pressed="true"] { background: var(--chip-on); color: var(--chip-on-ink); }
.covers { width: 100%; border-collapse: collapse; }
.covers th { text-align: left; font-size: .75rem; color: var(--muted); font-weight: 600; padding: 4px 6px; border-bottom: 1px solid var(--line); }
.covers td { padding: 7px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
.covers tr:last-child td { border-bottom: 0; }
.covers .y { width: 3.4em; color: var(--muted); font-variant-numeric: tabular-nums; }
.covers .who { font-weight: 600; }
.covers .k { text-align: right; white-space: nowrap; }
.fl { margin-right: 6px; }
.as { display: block; font-size: .8rem; font-weight: 400; color: var(--muted); }
.b { display: inline-block; font-style: normal; font-size: .72rem; padding: 1px 7px; border-radius: 6px; background: var(--accent-soft); color: var(--fg); margin: 0 4px 2px 0; }
.b.self { background: var(--self-soft); color: var(--self); font-weight: 700; }
.note { font-size: .82rem; margin: .6rem 0 0; }
@media (max-width: 560px) {
  .covers thead { display: none; }
  .covers tr { display: grid; grid-template-columns: 3.4em 1fr; }
  .covers .k { grid-column: 2; text-align: left; padding-top: 0; white-space: normal; }
  .covers td { border-bottom: 0; }
  .covers tr { border-bottom: 1px solid var(--line); }
}
.links { list-style: none; margin: 0; padding: 0; }
.links li { padding: 5px 0; }
.qa details { border-top: 1px solid var(--line); padding: 8px 0; }
.qa details:first-of-type { border-top: 0; }
.qa summary { font-weight: 650; cursor: pointer; }
.qa p { margin: .3rem 0 0; }
.src { font-size: .82rem; }
.prose h2 { margin-top: 1.4rem; }
.prose h2:first-child { margin-top: 0; }

.foot { border-top: 1px solid var(--line); padding: 20px 16px 28px; text-align: center; font-size: .82rem; color: var(--muted); }
.foot p { margin: .3rem 0; }
.theme { border: 0; background: none; color: var(--link); font: inherit; cursor: pointer; padding: 0; }
.fk-hub { margin-top: .8rem !important; }