:root{--ink:#35261f;--muted:#715c50;--paper:#fff9f1;--cream:#fff1dd;--orange:#e85d31;--orange-dark:#b63f1f;--peach:#ffdac0;--gold:#f3b54a;--line:#e9cbb5;--green:#4d795f;--shadow:0 14px 35px rgba(121,66,36,.12)}
*{box-sizing:border-box} body{margin:0;background:linear-gradient(135deg,#fff6e9 0%,#ffe7cf 48%,#fff8ef 100%);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.7}
button{font:inherit;cursor:pointer}.wrap{width:min(1060px,calc(100% - 32px));margin:auto}.hero{padding:36px 0 24px}.eyebrow{color:var(--orange-dark);font-weight:800;letter-spacing:.08em;font-size:.82rem}.hero h1{font-size:clamp(1.9rem,5vw,3.4rem);line-height:1.22;margin:.25rem 0 .55rem}.hero p{margin:0;color:var(--muted);font-size:1.03rem}.steps{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.step{border:1px solid var(--line);background:#fffaf4;padding:6px 12px;border-radius:999px;font-size:.88rem;font-weight:700}.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:22px;align-items:start;padding-bottom:40px}.side{position:sticky;top:14px;background:rgba(255,250,244,.88);border:1px solid var(--line);border-radius:20px;padding:16px;box-shadow:var(--shadow)}.side h2{font-size:1rem;margin:0 0 8px}.progress-line{height:9px;background:#f7ddc8;border-radius:9px;overflow:hidden}.progress-line span{display:block;height:100%;width:4%;background:linear-gradient(90deg,var(--orange),var(--gold));transition:width .25s}.progress-text{margin:8px 0 13px;font-size:.85rem;color:var(--muted)}.term-list{max-height:55vh;overflow:auto;display:grid;gap:4px;padding-right:2px}.term-list button{border:0;border-radius:9px;background:transparent;padding:8px;text-align:left;color:var(--ink);font-size:.87rem}.term-list button:hover,.term-list button[aria-current="true"]{background:var(--peach);font-weight:800}.quiz{background:var(--paper);border:1px solid var(--line);border-radius:26px;box-shadow:var(--shadow);overflow:hidden}.quiz-top{background:linear-gradient(105deg,#f47b42,#dd522e);color:white;padding:18px 26px;display:flex;align-items:center;justify-content:space-between;gap:16px}.label{font-size:.78rem;font-weight:800;letter-spacing:.08em}.counter{font-weight:700;background:rgba(255,255,255,.2);border-radius:99px;padding:4px 10px;white-space:nowrap}.quiz-body{padding:28px}.topic{color:var(--orange-dark);font-size:.95rem;font-weight:800;margin:0}.question{font-size:clamp(1.35rem,3vw,1.85rem);line-height:1.55;margin:8px 0 24px}.choices{display:grid;gap:12px}.choice{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;background:#fff;border:2px solid #efd8c5;border-radius:15px;padding:15px 16px;color:var(--ink);font-weight:650;transition:.18s}.choice:hover:not(:disabled){border-color:var(--orange);transform:translateY(-1px)}.choice:disabled{cursor:default}.letter{display:grid;place-items:center;width:27px;height:27px;flex:none;border-radius:50%;background:var(--cream);color:var(--orange-dark);font-weight:900}.choice.correct{border-color:var(--green);background:#edf7ef}.choice.wrong{border-color:#b84635;background:#fff0ed}.feedback{margin-top:22px;border-radius:16px;padding:18px;background:#fff2df;border-left:5px solid var(--gold)}.feedback[hidden],.details[hidden]{display:none}.feedback h3{margin:0 0 6px;font-size:1.15rem}.feedback p{margin:0}.actions{display:flex;justify-content:space-between;gap:10px;margin-top:24px}.button{border:0;border-radius:12px;padding:11px 16px;font-weight:800}.button.secondary{background:var(--cream);color:var(--ink)}.button.primary{background:var(--orange);color:white}.button.primary:hover{background:var(--orange-dark)}.details{border-top:1px solid var(--line);padding:24px 28px 28px;background:#fffdf9}.details h2{font-size:1.25rem;margin:0 0 10px}.details h3{font-size:1rem;margin:20px 0 5px;color:var(--orange-dark)}.details p{margin:0}.benefit{margin-top:18px;background:#fff0db;border-radius:14px;padding:15px 17px}.benefit strong{color:var(--orange-dark)}.footer-note{color:var(--muted);font-size:.84rem;padding:8px 0 28px}@media(max-width:760px){.hero{padding-top:24px}.layout{grid-template-columns:1fr}.side{position:static}.term-list{max-height:none;grid-template-columns:repeat(2,minmax(0,1fr))}.quiz-body{padding:22px}.details{padding:22px}.quiz-top{padding:16px 20px}}@media(max-width:430px){.term-list{grid-template-columns:1fr}.actions{flex-direction:column}.actions .button{width:100%}}
.feedback h4{margin:16px 0 5px;font-size:1rem;color:var(--orange-dark)}
.choice-notes{margin:0;padding-left:1.25rem;font-size:.94rem}
.choice-notes li+li{margin-top:5px}
.choice-notes em{font-style:normal;color:var(--green);font-weight:800}
  

/* ===== 2026-09-20 追加：テーマ切り替えリンクと、スマホでの並び替え ===== */
.quiz-nav{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.quiz-nav a{display:inline-block;border:1px solid var(--line);background:#fffaf4;color:var(--ink);text-decoration:none;padding:7px 14px;border-radius:999px;font-size:.88rem;font-weight:800}
.quiz-nav a:hover{border-color:var(--orange);color:var(--orange-dark)}
.quiz-nav a[aria-current="page"]{background:var(--orange);border-color:var(--orange);color:#fff}
.side-note{margin:12px 0 0;font-size:.82rem;color:var(--muted)}

@media(max-width:760px){
  /* スマホでは、まず問題。DAY一覧はその下に横並びのチップで置く */
  .side{order:2;margin-top:18px}
  .term-list{grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:6px}
  .term-list button{text-align:center;background:#fffaf4;border:1px solid var(--line);font-size:.82rem;padding:9px 6px}
  .steps{gap:8px}
  .step{font-size:.82rem}
}
@media(max-width:430px){
  .term-list{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}
}