:root{font:16px/1.75 system-ui,-apple-system,'Segoe UI',sans-serif;color:#1b3040;background:#f6f8fc;color-scheme:light;--accent:#4f46c7;--line:#dfe4ef}*{box-sizing:border-box}body{margin:0}a{color:var(--accent);text-underline-offset:4px}header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:20px max(20px,calc((100vw - 1120px)/2));background:#fff;border-bottom:1px solid var(--line)}.brand{color:#1b3040;text-decoration:none;white-space:nowrap}nav{display:flex;gap:20px;align-items:center;flex-wrap:wrap}main{max-width:1000px;margin:auto;padding:32px 24px 64px}h1{font-size:clamp(30px,5vw,54px);line-height:1.16;letter-spacing:-.04em;margin:16px 0 24px}h2{font-size:24px;line-height:1.3;letter-spacing:-.02em}h3{font-size:18px}.hero{padding:24px 0 32px;max-width:850px}.lead{font-size:18px;color:#485e70}.eyebrow{font-size:12px;letter-spacing:.09em;font-weight:750;color:var(--accent)}.panel,.notice{border:1px solid var(--line);background:#fff;border-radius:20px;padding:32px;margin:24px 0}.notice{background:#eeedfd}.notice h2{font-size:20px}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.guideCard{display:block;border:1px solid var(--line);border-radius:16px;padding:24px;background:#fff;text-decoration:none;color:#1b3040}.guideCard h2{font-size:21px}.guideCard p,.note,.helpers,.sources{font-size:14px;color:#586c78}.guideCard b{color:var(--accent)}.guideCard:hover{border-color:var(--accent)}.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 20px;min-height:48px;font:inherit;font-weight:650;background:var(--accent);color:#fff;border:1px solid transparent;border-radius:12px;text-decoration:none;cursor:pointer}.secondary{background:#fff;color:var(--accent);border-color:var(--line)}.contents{padding:16px 0;border-block:1px solid var(--line);font-size:14px}.crumb{font-size:13px;color:#586c78}.english{font-size:20px;line-height:1.75;white-space:pre-line;overflow-wrap:anywhere}.plan{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;padding-left:24px}li{padding-left:4px;margin:12px 0}summary{cursor:pointer;color:var(--accent);min-height:44px;padding:8px 0;font-weight:650}fieldset{border:0;padding:0;margin:0;min-width:0}legend{padding:0;max-width:100%;margin:16px 0}input{accent-color:var(--accent);flex-shrink:0}.option{display:flex;align-items:center;gap:12px;padding:14px 16px;margin:12px 0;min-height:56px;border:1px solid var(--line);border-radius:12px;cursor:pointer;overflow-wrap:anywhere}.option:has(input:checked){border-color:var(--accent);background:#eeedfd}.option.correct{background:#e5f4eb;border-color:#16724d}.option.wrong{background:#fceef0;border-color:#ad3e4c}.letter{font-weight:750;font-size:14px}.feedback{margin:24px 0;padding:20px;background:#f6f8fc;border:1px solid var(--line);border-radius:12px}.outcome{font-weight:750}.reasons{list-style:none;padding:0}.reasons li{padding:12px 0;border-bottom:1px solid var(--line)}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px}.sources{padding:16px 0}footer{border-top:1px solid var(--line);text-align:center;font-size:13px;padding:32px 20px}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}section,main{scroll-margin-top:24px}.skip{position:absolute;top:-100px;left:16px;background:#fff;padding:12px;z-index:10}.skip:focus{top:8px}[hidden]{display:none!important}@media(max-width:650px){header{padding:16px;align-items:flex-start;flex-direction:column;gap:12px}header nav{gap:12px;font-size:14px}main{padding:24px 16px 48px}.hero{padding-top:8px}.panel,.notice{padding:24px 18px;border-radius:16px}.cards,.plan{grid-template-columns:minmax(0,1fr)}.guideCard{padding:24px 20px}.english{font-size:18px}h2{font-size:22px}.contents{gap:12px}.option{padding:12px;gap:8px}form>.button{width:100%}.lead{font-size:17px}}@media(prefers-reduced-motion:no-preference){.guideCard{transition:border-color .15s}}