:root{--bg:#f6f7f4;--card:#fff;--ink:#1d2421;--muted:#5b6661;--line:#dfe4e0;--brand:#0f5c4d;--brand-2:#e6f2ee;--ok:#12703f;--ok-bg:#e5f5ea;--ng:#a3261c;--ng-bg:#fbe9e7;--focus:#e0a100;--S:#8a4b00;--M:#1f4f99;--T:#6b2f86}
@media (prefers-color-scheme:dark){:root{--bg:#121614;--card:#1b211e;--ink:#e8ece9;--muted:#a3ada8;--line:#2e3632;--brand:#5fc3a8;--brand-2:#1f302b;--ok:#6fd49a;--ok-bg:#1c3326;--ng:#ff8f82;--ng-bg:#3a2220;--S:#f0b36a;--M:#8fb4f5;--T:#d49cf0}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Hiragino Sans","Noto Sans JP","Yu Gothic UI",sans-serif;font-size:16px;line-height:1.75}
a{color:var(--brand)}
a:focus-visible,button:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.wrap{max-width:720px;margin:0 auto;padding:0 16px}
.top{background:var(--card);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px;flex-wrap:wrap}
.brand{font-weight:700;text-decoration:none;color:var(--ink);font-size:18px;line-height:1.2}
.brand small{display:block;font-weight:400;font-size:12px;color:var(--muted)}
.top nav{display:flex;gap:14px;font-size:14px}
main{padding:16px 0 32px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 16px;margin:0 0 16px}
h1{font-size:22px;line-height:1.4;margin:0 0 10px}
h2{font-size:18px;margin:18px 0 8px}
h3{font-size:16px;margin:16px 0 6px}
.lead{color:var(--muted);margin:0 0 12px}
.sub{font-size:16px;margin:18px 0 8px}
.small{font-size:13px;color:var(--muted)}
.muted{color:var(--muted)}
.crumbs{font-size:13px;color:var(--muted);margin:0 0 8px}
.meta{margin:0 0 8px;display:flex;gap:6px;flex-wrap:wrap}
.tag{font-size:12px;border:1px solid var(--line);border-radius:999px;padding:1px 10px;color:var(--muted)}
.tag.fS{color:var(--S);border-color:currentColor}.tag.fM{color:var(--M);border-color:currentColor}.tag.fT{color:var(--T);border-color:currentColor}
.stem{margin:0 0 10px}
.items{margin:0 0 12px;padding-left:1.1em}
.items:empty{display:none}
.items li{margin:2px 0}
.choices{list-style:none;margin:0 0 12px;padding:0;display:grid;gap:10px}
.choice{width:100%;display:flex;gap:12px;align-items:flex-start;text-align:left;font:inherit;color:inherit;background:var(--card);border:2px solid var(--line);border-radius:12px;padding:12px;min-height:52px;cursor:pointer}
.choice:hover{border-color:var(--brand)}
.choice .k{flex:0 0 auto;display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand-2);color:var(--brand);font-weight:700}
.choice[disabled]{cursor:default}
.choice.is-ok{border-color:var(--ok);background:var(--ok-bg)}
.choice.is-ng{border-color:var(--ng);background:var(--ng-bg)}
.result{font-weight:700;margin:4px 0 10px;padding:8px 12px;border-radius:10px}
.result.ok{color:var(--ok);background:var(--ok-bg)}
.result.ng{color:var(--ng);background:var(--ng-bg)}
details.ans{border-top:1px solid var(--line);padding-top:8px}
details.ans summary{cursor:pointer;color:var(--brand);font-weight:700;padding:6px 0}
.expl h2{font-size:16px;margin:10px 0 4px}
.by,.src,.note{font-size:13px;color:var(--muted);margin:6px 0 0}
.note:empty{display:none}
.btn{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:0;font:inherit;font-weight:700;text-decoration:none;color:var(--brand);background:var(--card);border:2px solid var(--brand);border-radius:12px;padding:10px 14px;min-height:48px;cursor:pointer}
.btn small{font-weight:400;font-size:12px;color:var(--muted)}
.btn.primary{background:var(--brand);color:var(--card)}
.btn.primary small{color:inherit;opacity:.85}
.btn.ghost{border-color:var(--line)}
.modes{display:grid;grid-template-columns:1fr;gap:10px;margin:8px 0}
@media (min-width:560px){.modes{grid-template-columns:repeat(3,1fr)}}
.modes.three{grid-template-columns:repeat(3,1fr)}
.modes.three .btn{font-size:14px;padding:10px 4px;word-break:keep-all}
.linkish{background:none;border:0;color:var(--brand);font:inherit;text-decoration:underline;cursor:pointer;padding:0 4px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:10px 0}
.stat{background:var(--brand-2);border-radius:10px;padding:8px;text-align:center}
.stat b{display:block;font-size:20px}
.stat span{font-size:12px;color:var(--muted)}
.qhead{display:flex;justify-content:space-between;gap:8px;font-size:14px;margin-bottom:6px;flex-wrap:wrap}
.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin-bottom:12px}
.bar span{display:block;height:100%;background:var(--brand);width:0;transition:width .2s}
#next{width:100%;margin-top:12px}
.score{font-size:22px;font-weight:700}
.qlist{list-style:none;padding:0;margin:0}
.qlist li{border-top:1px solid var(--line)}
.qlist a{display:block;padding:10px 2px;text-decoration:none;color:var(--ink)}
.qlist .qn{display:inline-block;min-width:6.5em;color:var(--muted);font-size:13px}
.qlist .ok{color:var(--ok)}.qlist .ng{color:var(--ng)}
.jump{display:flex;gap:10px;flex-wrap:wrap;font-size:14px}
.pn{display:flex;justify-content:space-between;margin:0 0 16px}
.cta{display:flex;gap:10px;flex-wrap:wrap}
.prose p{margin:0 0 10px}
.ad{margin:16px 0;min-height:100px}
.ad-label{display:block;font-size:11px;color:var(--muted)}
.foot{border-top:1px solid var(--line);font-size:13px;color:var(--muted);padding:16px 0 28px}
.foot p{margin:4px 0}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.planform{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin:0 0 12px}
.planform label{display:flex;flex-direction:column;font-size:14px;color:var(--muted);gap:4px}
.planform input,.planform select{font:inherit;min-height:44px;padding:6px 10px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink)}
.planlist{list-style:none;margin:8px 0;padding:0}
.pday{display:grid;grid-template-columns:28px 7.5em 1fr;gap:6px;align-items:start;padding:8px 4px;border-bottom:1px solid var(--line)}
.pday input{width:22px;height:22px;margin:3px 0 0}
.pday label{font-size:14px;font-weight:600}
.pday .ptasks{font-size:14px}
.pday.today{background:var(--brand-2);border-radius:8px}
.pday.done .ptasks,.pday.done label{color:var(--muted);text-decoration:line-through}
.pday.k-review .ptasks a,.pday.k-weak .ptasks a,.pday.k-final .ptasks a{font-weight:600}
.notice{background:var(--brand-2);border-radius:10px;padding:8px 12px;font-size:14px}
.spec{display:grid;grid-template-columns:4em 1fr;gap:6px 10px;margin:8px 0}
.spec dt{font-weight:600;color:var(--muted);font-size:14px}
.spec dd{margin:0}
.spec ul{margin:0;padding-left:1.1em}
.aff{margin:8px 0 0}
.pr{display:inline-block;font-size:11px;border:1px solid var(--muted);color:var(--muted);border-radius:4px;padding:0 5px;margin-right:6px}
@media (max-width:420px){.pday{grid-template-columns:26px 1fr}.pday .ptasks{grid-column:2}}