:root {
  --bg: #f7f4ee;
  --surface: #ffffff;
  --surface-2: #f1ece2;
  --ink: #23201b;
  --ink-2: #5b554b;
  --line: #e2dbcd;
  --accent: #b5392b;      /* 朱 */
  --accent-ink: #ffffff;
  --accent-soft: #f6e3df;
  --ai: #24477a;          /* 藍 */
  --ok: #1f7a4d;
  --ok-soft: #e1f2e8;
  --ng: #b5392b;
  --ng-soft: #f8e1dd;
  --shadow: 0 1px 2px rgba(40, 30, 10, .06), 0 4px 14px rgba(40, 30, 10, .06);
  --serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1814; --surface: #24211c; --surface-2: #2d2a23; --ink: #eee8dc; --ink-2: #b3ab9c;
    --line: #3b372f; --accent: #e0705f; --accent-ink: #1a1814; --accent-soft: #3d2620; --ai: #8fb0e0;
    --ok: #5cc28d; --ok-soft: #1d3428; --ng: #e8806f; --ng-soft: #3d2420; --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #1a1814; --surface: #24211c; --surface-2: #2d2a23; --ink: #eee8dc; --ink-2: #b3ab9c;
  --line: #3b372f; --accent: #e0705f; --accent-ink: #1a1814; --accent-soft: #3d2620; --ai: #8fb0e0;
  --ok: #5cc28d; --ok-soft: #1d3428; --ng: #e8806f; --ng-soft: #3d2420; --shadow: none; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.8;
}
a { color: var(--ai); }
img { max-width: 100%; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

/* header */
.site-head { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.site-head .wrap { display: flex; align-items: center; gap: 16px; height: 56px; }
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-family: var(--serif); font-weight: 700; font-size: 19px; white-space: nowrap; }
.logo .mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 6px; background: var(--accent); color: var(--accent-ink); font-size: 17px; }
.nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; }
.nav a { text-decoration: none; color: var(--ink-2); font-size: 14px; padding: 6px 10px; border-radius: 6px; white-space: nowrap; }
.nav a:hover, .nav a.on { color: var(--ink); background: var(--surface-2); }
.nav { scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
@media (max-width: 560px) {
  .logo .txt small { display: none; }
  .nav a { padding: 6px 7px; font-size: 13px; }
  .nav a:first-child { display: none; } /* ホームはロゴで戻れる */
  .site-head .wrap { gap: 8px; }
  .logo { font-size: 16px; gap: 6px; }
  .logo .mark { width: 26px; height: 26px; font-size: 15px; }
  .nav { gap: 0; }
}

/* hero */
.hero { padding: 40px 0 28px; }
.hero h1 { font-family: var(--serif); font-size: clamp(23px, 5vw, 38px); line-height: 1.35; margin: 0 0 10px; }
.hero h1 span { display: inline-block; }
.hero p { color: var(--ink-2); margin: 0; max-width: 40em; }

h1, h2, h3 { font-family: var(--serif); line-height: 1.4; }
.sec-title { font-size: 21px; margin: 36px 0 14px; display: flex; align-items: baseline; gap: 10px; }
.sec-title small { font-family: var(--sans); font-size: 13px; color: var(--ink-2); font-weight: 400; }

/* cards */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.cat-card { display: flex; gap: 14px; padding: 16px; text-decoration: none; color: var(--ink); transition: border-color .15s; }
.cat-card:hover { border-color: var(--accent); }
.cat-card .ic { flex: none; width: 46px; height: 46px; border-radius: 10px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-family: var(--serif); font-size: 24px; font-weight: 700; }
.cat-card h3 { margin: 0 0 2px; font-size: 16px; }
.cat-card p { margin: 0; font-size: 13px; color: var(--ink-2); line-height: 1.6; }
.cat-card .meta { font-size: 12px; color: var(--ink-2); margin-top: 6px; }
.cat-card .meta b { color: var(--accent); }

/* stats */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 18px; }
.stat { padding: 12px 14px; }
.stat .v { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .l { font-size: 12px; color: var(--ink-2); }
.stat a { font-size: 12px; }

/* quiz */
.quiz { padding: 22px; margin: 8px 0 0; }
.quiz-start { text-align: center; padding: 10px 0; }
.quiz-start h2 { margin: 0 0 6px; font-size: 22px; }
.quiz-start p { margin: 0 0 16px; color: var(--ink-2); font-size: 14px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; font: inherit; font-weight: 700; font-size: 15px; border: 0; border-radius: 10px; padding: 12px 22px; cursor: pointer; background: var(--accent); color: var(--accent-ink); text-decoration: none; }
.btn:hover { filter: brightness(1.06); }
.btn.sub { background: var(--surface-2); color: var(--ink); border: 1px solid var(--line); }
.btn-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.q-top { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--ink-2); }
.q-cat { background: var(--surface-2); padding: 2px 8px; border-radius: 999px; }
.bar { height: 6px; background: var(--surface-2); border-radius: 99px; margin: 8px 0 18px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); transition: width .25s; }
.q-text { font-family: var(--serif); font-size: clamp(22px, 4.6vw, 30px); font-weight: 700; text-align: center; margin: 8px 0 6px; line-height: 1.5; word-break: break-word; }
.q-text.long { font-size: clamp(17px, 3.4vw, 21px); text-align: left; }
.q-text u { text-decoration: none; border-bottom: 3px solid var(--accent); padding: 0 2px; }
.q-ask { text-align: center; color: var(--ink-2); font-size: 14px; margin-bottom: 18px; }
.choices { display: grid; gap: 10px; }
.choice { display: flex; align-items: center; gap: 12px; text-align: left; width: 100%; font: inherit; font-size: 16px; color: var(--ink); background: var(--surface); border: 1.5px solid var(--line); border-radius: 10px; padding: 12px 14px; cursor: pointer; line-height: 1.5; }
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice .n { flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); font-size: 13px; font-weight: 700; color: var(--ink-2); }
.choice:disabled { cursor: default; }
.choice.ok { border-color: var(--ok); background: var(--ok-soft); }
.choice.ok .n { background: var(--ok); color: #fff; }
.choice.ng { border-color: var(--ng); background: var(--ng-soft); }
.choice.ng .n { background: var(--ng); color: #fff; }
.feedback { margin-top: 16px; padding: 14px 16px; border-radius: 10px; background: var(--surface-2); font-size: 15px; }
.feedback .res { font-weight: 700; font-size: 17px; margin-bottom: 4px; }
.feedback .res.ok { color: var(--ok); }
.feedback .res.ng { color: var(--ng); }
.next-row { margin-top: 16px; text-align: right; }
.kbd-hint { font-size: 12px; color: var(--ink-2); text-align: center; margin-top: 12px; }
@media (hover: none) { .kbd-hint { display: none; } }

.result { text-align: center; }
.result .score { font-family: var(--serif); font-size: 54px; font-weight: 700; line-height: 1.1; margin: 6px 0; }
.result .score small { font-size: 22px; color: var(--ink-2); }
.result .msg { color: var(--ink-2); margin-bottom: 18px; }
.miss-list { text-align: left; margin: 18px 0; padding: 0; list-style: none; }
.miss-list li { border-top: 1px solid var(--line); padding: 10px 2px; font-size: 14px; }
.miss-list b { font-family: var(--serif); font-size: 16px; }
.miss-list .ans { color: var(--ok); font-weight: 700; }

.spk { font: inherit; font-size: 15px; line-height: 1; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; padding: 4px 9px; cursor: pointer; vertical-align: middle; margin-left: 4px; }
.spk:hover { border-color: var(--accent); }
.opt { display: inline-flex; align-items: center; gap: 6px; margin-top: 14px; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--ink); }
.timer.low { color: var(--ng); }
.res-h { font-size: 16px; text-align: left; margin: 22px 0 8px; }
.cat-rows { display: grid; gap: 6px; text-align: left; }
.cat-row { display: grid; grid-template-columns: minmax(7em, 13em) 1fr 3em; align-items: center; gap: 10px; font-size: 14px; }
.cat-row a { color: var(--ink); text-decoration: none; }
.cbar { height: 10px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.cbar i { display: block; height: 100%; background: var(--ai); }
.cnum { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-2); }
.hist { display: inline-block; margin-right: 10px; }
.listen-ctl { display: flex; flex-wrap: wrap; gap: 10px 18px; font-size: 14px; color: var(--ink-2); margin-bottom: 16px; }
.listen-ctl select { font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 4px 8px; margin-left: 4px; }
.listen-card { border: 1px solid var(--line); border-radius: 10px; padding: 16px; min-height: 230px; }
.listen-ans { margin-top: 14px; padding: 12px 14px; border-radius: 10px; background: var(--surface-2); font-size: 15px; }
.listen-ans:empty { display: none; }
.listen-ans .res { font-weight: 700; color: var(--ok); font-size: 17px; }

/* q list */
.qlist details { border-top: 1px solid var(--line); padding: 10px 2px; }
.qlist details:last-child { border-bottom: 1px solid var(--line); }
.qlist summary { cursor: pointer; font-family: var(--serif); font-weight: 700; }
.qlist summary u { text-decoration: none; border-bottom: 2px solid var(--accent); }
.qlist .a { color: var(--ok); font-weight: 700; margin: 6px 0 2px; }
.qlist .e { color: var(--ink-2); font-size: 14px; margin: 0; }

/* article */
.article { padding: 28px; margin-top: 20px; }
.article h1 { font-size: clamp(22px, 4.4vw, 30px); margin: 0 0 6px; }
.article .date { color: var(--ink-2); font-size: 13px; margin-bottom: 18px; }
.article h2 { font-size: 20px; margin: 30px 0 10px; padding-left: 10px; border-left: 4px solid var(--accent); }
.article h3 { font-size: 17px; margin: 20px 0 6px; }
.article table { border-collapse: collapse; width: 100%; font-size: 14px; display: block; overflow-x: auto; }
.article th, .article td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.article th { background: var(--surface-2); white-space: nowrap; }
.article li { margin: 4px 0; }
@media (max-width: 560px) { .article, .quiz { padding: 18px 16px; } }
.cta { margin-top: 26px; padding: 16px; border-radius: 10px; background: var(--accent-soft); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.cta p { margin: 0; font-weight: 700; }

.art-list { display: grid; gap: 10px; }
.art-item { display: block; padding: 14px 16px; text-decoration: none; color: var(--ink); }
.art-item:hover { border-color: var(--accent); }
.art-item h3 { margin: 0 0 4px; font-size: 16px; }
.art-item p { margin: 0; font-size: 13px; color: var(--ink-2); line-height: 1.6; }

.crumb { font-size: 13px; color: var(--ink-2); margin: 16px 0 0; }
.crumb a { color: var(--ink-2); }
.intro { color: var(--ink-2); font-size: 15px; }
.intro p { margin: 6px 0; }
.note { font-size: 13px; color: var(--ink-2); }

.site-foot { margin-top: 56px; padding: 28px 0 36px; border-top: 1px solid var(--line); background: var(--surface); font-size: 13px; color: var(--ink-2); }
.site-foot .links { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 10px; }
.site-foot a { color: var(--ink-2); }
.theme-btn { font: inherit; font-size: 13px; background: none; border: 1px solid var(--line); color: var(--ink-2); border-radius: 6px; padding: 2px 10px; cursor: pointer; }