/* Layout: 1カラムの読み物。問題カードを縦に積み、入口（年齢・難易度・テーマ）はチップで並べる */
:root {
  --bg: #f3f6f1;        /* 葉の影色を少し混ぜた白 */
  --surface: #ffffff;
  --ink: #1d2a23;
  --ink-soft: #52625a;
  --line: #d6ded5;
  --moss: #2e6a4e;      /* アクセント：森の緑 */
  --moss-soft: #e3eee6;
  --sun: #f2b705;       /* 「？」と答えの色 */
  --sun-soft: #fff4d1;
  --font-display: "Zen Maru Gothic", "Hiragino Maru Gothic ProN", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --font-body: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121a16; --surface: #1a2620; --ink: #e5eee8; --ink-soft: #a5b6ac; --line: #2f3e36;
    --moss: #7cc6a0; --moss-soft: #203a2e; --sun: #f5c842; --sun-soft: #3a3214; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121a16; --surface: #1a2620; --ink: #e5eee8; --ink-soft: #a5b6ac; --line: #2f3e36;
  --moss: #7cc6a0; --moss-soft: #203a2e; --sun: #f5c842; --sun-soft: #3a3214; 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(--font-body); font-size: 16px; line-height: 1.8;
}
a { color: var(--moss); text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible, button:focus-visible, select:focus-visible {
  outline: 3px solid var(--sun); outline-offset: 2px; border-radius: 6px;
}
h1, h2, h3 { font-family: var(--font-display); line-height: 1.4; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(1.5rem, 4.5vw, 2rem); font-weight: 900; }
h2 { font-size: 1.3rem; font-weight: 900; }
h3 { font-size: 1rem; font-weight: 700; color: var(--ink-soft); }
p { margin: 0; }

.wrap {
  max-width: 760px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* ヘッダー */
.site-head { background: var(--surface); border-bottom: 1px solid var(--line); }
.head-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 20px; padding-block: 12px; }
.logo { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 900; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.logo-mark { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--sun); color: #1d2a23; font-size: 1.1rem; }
.head-nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 0.9rem; }
.head-nav a { color: var(--ink-soft); text-decoration: none; }
.head-nav a:hover { color: var(--moss); }

.main { display: flex; flex-direction: column; gap: 28px; padding-block: 20px 48px; }
.crumbs { font-size: 0.8rem; color: var(--ink-soft); }
.crumbs a { color: var(--ink-soft); }
.lead { color: var(--ink-soft); max-width: 40em; }
.meta-line { font-size: 0.85rem; color: var(--ink-soft); }
.todo { padding: 10px 14px; border: 1px dashed var(--line); border-radius: 10px; color: var(--ink-soft); font-size: 0.9rem; }

/* トップ */
.hero { display: flex; flex-direction: column; gap: 12px; padding-block: 8px; }
.hero-kicker { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.08em; color: var(--moss); }
.today, .pick, .uses, .newest, .related { display: flex; flex-direction: column; gap: 12px; }
.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; }
.two-col > * { min-width: 0; }
.use-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.use-list a { display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink); }
.use-list strong { font-family: var(--font-display); color: var(--moss); }
.use-list span { font-size: 0.85rem; color: var(--ink-soft); line-height: 1.6; }

/* チップ */
.chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips a { display: inline-flex; align-items: baseline; gap: 8px; padding: 8px 14px; border-radius: 999px; background: var(--moss-soft); color: var(--ink); text-decoration: none; font-weight: 700; font-size: 0.95rem; }
.chips a:hover { background: var(--moss); color: var(--surface); }
.cnt { font-size: 0.75rem; font-weight: 400; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.chips a:hover .cnt { color: inherit; }

/* 一覧の見出し */
.list-head { display: flex; flex-direction: column; gap: 10px; }
.tools { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 4px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 18px; border: 0; border-radius: 999px; background: var(--moss); color: var(--surface); font: 700 0.95rem var(--font-body); text-decoration: none; cursor: pointer; }
.btn-sub { background: transparent; color: var(--moss); box-shadow: inset 0 0 0 2px var(--moss); }
.btn:hover { filter: brightness(1.08); }

/* 問題カード */
.q-list { display: flex; flex-direction: column; gap: 14px; }
.q { display: flex; flex-direction: column; gap: 10px; padding: 18px 18px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.q-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; font-size: 0.8rem; color: var(--ink-soft); }
.q-idx { font-family: var(--font-display); font-weight: 900; color: var(--moss); font-size: 1rem; }
.q-no { font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
.lv { display: inline-flex; gap: 6px; align-items: center; }
.q-draft { padding: 0 8px; border-radius: 999px; border: 1px dashed var(--ink-soft); font-size: 0.75rem; }
.lv-stars { color: var(--sun); letter-spacing: 0.05em; }
.q-text { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; line-height: 1.6; }
.q-single .q-text { font-size: clamp(1.35rem, 4vw, 1.7rem); }
.q-actions { display: flex; flex-direction: column; gap: 8px; }
.q details > summary { display: inline-flex; align-items: center; min-height: 40px; padding: 4px 16px; border-radius: 999px; cursor: pointer; list-style: none; font-weight: 700; font-size: 0.9rem; user-select: none; }
.q details > summary::-webkit-details-marker { display: none; }
.q-hint > summary { color: var(--moss); box-shadow: inset 0 0 0 1.5px var(--moss); }
.q-hint[open] > summary { background: var(--moss-soft); }
.q-hint p { padding: 8px 4px 0; color: var(--ink-soft); }
.q-ans > summary { background: var(--sun); color: #1d2a23; }
.q-ans-body { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; padding: 12px 14px; border-radius: 10px; background: var(--sun-soft); }
.q-a strong { font-family: var(--font-display); font-size: 1.25rem; }
.q-ex { font-size: 0.92rem; color: var(--ink-soft); }
.q-more { font-size: 0.85rem; }
.tags { list-style: none; margin: 4px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.tags a { display: inline-block; padding: 2px 10px; border-radius: 999px; border: 1px solid var(--line); font-size: 0.8rem; color: var(--ink-soft); text-decoration: none; }
.pager { display: flex; justify-content: space-between; gap: 12px; font-weight: 700; }
.rel-list { margin: 0; padding-left: 1.2em; display: flex; flex-direction: column; gap: 6px; }
.report { font-size: 0.85rem; color: var(--ink-soft); }

/* 広告枠（試作表示） */
.ad-slot { display: grid; place-items: center; min-height: 100px; border: 1.5px dashed var(--line); border-radius: 10px; color: var(--ink-soft); font-size: 0.8rem; }

/* 出題モード */
.play { display: flex; flex-direction: column; gap: 14px; }
.play-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.play-controls select { min-height: 44px; padding: 6px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: inherit; }
.play-count { font-size: 0.85rem; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.play-card { display: flex; flex-direction: column; gap: 16px; padding: 28px 22px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; min-height: 300px; }
.play-no { font-size: 0.8rem; color: var(--ink-soft); }
.play-q { font-family: var(--font-display); font-weight: 900; font-size: clamp(1.4rem, 5vw, 2rem); line-height: 1.55; }
.play-h { color: var(--moss); font-weight: 700; }
.play-a { padding: 12px 16px; border-radius: 12px; background: var(--sun-soft); font-family: var(--font-display); font-weight: 900; font-size: 1.4rem; }
.play-a small { display: block; font-family: var(--font-body); font-weight: 400; font-size: 0.9rem; color: var(--ink-soft); }
.play-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.btn-next { background: var(--ink); }

/* 印刷用 */
.print-tools { display: flex; flex-direction: column; gap: 10px; color: var(--ink-soft); font-size: 0.9rem; }
.sheet { display: flex; flex-direction: column; gap: 14px; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.sheet-name { text-align: right; }
.print-q, .print-a { list-style: none; margin: 0; padding: 0; }
.print-q { display: flex; flex-direction: column; gap: 18px; font-size: 1.1rem; }
.print-q li { display: flex; flex-direction: column; gap: 10px; break-inside: avoid; }
.pq { display: flex; gap: 10px; align-items: baseline; }
.pnum { flex: none; min-width: 2.2em; font-family: var(--font-display); font-weight: 900; color: var(--moss); font-variant-numeric: tabular-nums; }
.pnum::before { content: "Q"; }
.print-a .pnum::before { content: ""; }
.print-a .pnum::after { content: "."; }
.print-q .pline { margin-left: calc(2.2em + 10px); }
.pline { display: block; height: 1.6em; border-bottom: 1px dashed var(--line); }
.print-a { columns: 2; column-gap: 32px; }
.print-a li { display: flex; gap: 6px; break-inside: avoid; }
.print-a .pnum { min-width: 1.8em; color: var(--ink-soft); }
.sheet-src { font-size: 0.75rem; color: var(--ink-soft); text-align: right; }

/* 運営者情報 */
.profile-dl { display: grid; grid-template-columns: max-content 1fr; gap: 8px 20px; margin: 0; padding: 16px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.profile-dl dt { font-weight: 700; color: var(--ink-soft); }
.profile-dl dd { margin: 0; min-width: 0; }
.prose { display: flex; flex-direction: column; gap: 14px; max-width: 40em; }
.prose h2 { margin-top: 12px; }
.prose ul { margin: 0; padding-left: 1.4em; }

/* フッター */
.site-foot { background: var(--surface); border-top: 1px solid var(--line); }
.foot-inner { display: flex; flex-direction: column; gap: 10px; padding-block: 24px; font-size: 0.85rem; color: var(--ink-soft); }
.foot-name { font-family: var(--font-display); font-weight: 900; color: var(--ink); display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.foot-owner { font-family: var(--font-body); font-weight: 400; font-size: 0.8rem; color: var(--ink-soft); }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.site-foot a { color: var(--ink-soft); }

@media (prefers-reduced-motion: no-preference) {
  .q-ans[open] .q-ans-body, .play-a:not([hidden]) { animation: pop 0.25s ease-out; }
  @keyframes pop { from { transform: scale(0.97); opacity: 0.4; } to { transform: none; opacity: 1; } }
}

@media print {
  /* ダークモードのまま印刷しても、白い紙に黒い文字で出るようにする */
  :root, :root:not([data-theme="light"]), :root[data-theme="dark"] {
    --bg: #fff; --surface: #fff; --ink: #000; --ink-soft: #333; --line: #999; --moss: #2e6a4e; color-scheme: light;
  }
  .site-head, .site-foot, .crumbs, .ad-slot, .no-print { display: none !important; }
  .main { padding: 0; }
  .sheet { border: 0; padding: 0; }
  .sheet-ans { break-before: page; }
  @page { size: A4; margin: 16mm; }
}