:root{--bg:#f5f6fb;--card:#ffffff;--card2:#f4f6fc;--txt:#0f172a;--sub:#4b5563;--accent:#6366f1;--accent-d:#4f46e5;--accent2:#8b5cf6;--ok:#16a34a;--ng:#e11d48;--line:#e6e9f2;--grad:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);--shadow:0 4px 24px rgba(15,23,42,.06);--shadow-lg:0 12px 32px rgba(79,70,229,.18);--radius:18px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{scroll-behavior:smooth}body{margin:0;color:var(--txt);background:var(--bg);background-image:radial-gradient(1200px 500px at 100% -10%,rgba(139,92,246,.1),transparent 60%),radial-gradient(900px 400px at -10% 0%,rgba(99,102,241,.1),transparent 55%);font-family:-apple-system,Segoe UI,Roboto,Helvetica Neue,Hiragino Kaku Gothic ProN,Noto Sans JP,Yu Gothic,Meiryo,sans-serif;line-height:1.75;font-size:16.5px;-webkit-font-smoothing:antialiased}.topbar{position:sticky;top:0;z-index:20;background:var(--grad);color:#fff;padding:14px 16px;box-shadow:0 6px 20px #4f46e540}.topbar .inner{max-width:760px;margin:0 auto;display:flex;align-items:center;gap:11px}.topbar h1{font-size:1.12rem;margin:0;font-weight:800;letter-spacing:.01em}.topbar .logo{width:30px;height:30px;border-radius:9px;background:#fff3;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900}.topbar .sub{margin-left:auto;font-size:.78rem;font-weight:600;background:#ffffff2e;padding:4px 12px;border-radius:999px}.brand{display:flex;align-items:center;gap:11px;cursor:pointer}.wrap{max-width:760px;margin:0 auto;padding:20px 15px 70px}h2{font-size:1.08rem;margin:0 0 6px;font-weight:800}.muted{color:var(--sub);font-size:.9rem;margin:0 0 14px}button{font-family:inherit;cursor:pointer}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:15px 0;box-shadow:var(--shadow)}.btn{display:block;width:100%;text-align:left;background:#fff;color:var(--txt);font-weight:600;border:1px solid var(--line);border-radius:14px;padding:15px 16px;margin:8px 0;font-size:1rem;transition:.18s}.btn:hover{border-color:var(--accent);background:var(--card2);transform:translateY(-1px)}.primary{background:var(--grad);color:#fff;border:none;font-weight:800;text-align:center;box-shadow:var(--shadow-lg)}.primary:hover{background:var(--grad);color:#fff;filter:brightness(1.05);transform:translateY(-1px)}.row{display:flex;gap:8px;flex-wrap:wrap}.chip{flex:1;min-width:64px;background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:11px 6px;text-align:center;font-size:.95rem;font-weight:600;color:var(--sub);transition:.16s}.chip:hover{border-color:var(--accent);color:var(--accent)}.chip.on{background:var(--grad);color:#fff;border-color:transparent;box-shadow:var(--shadow-lg)}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:10px}.setbtn{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 12px;text-align:center;color:var(--txt);font-weight:700;transition:.16s}.setbtn:hover{border-color:var(--accent);background:var(--card2);transform:translateY(-2px);box-shadow:var(--shadow)}.setbtn small{display:block;color:var(--sub);font-size:.78rem;font-weight:600;margin-top:3px}.exambtn{position:relative;display:flex;justify-content:space-between;align-items:center;width:100%;background:#fff;color:var(--txt);border:1px solid var(--line);border-radius:16px;overflow:hidden;padding:18px 18px 18px 22px;margin:11px 0;font-size:1.1rem;font-weight:800;transition:.18s;box-shadow:var(--shadow)}.exambtn:before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--grad)}.exambtn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:transparent}.exambtn span{font-size:.8rem;font-weight:600;color:var(--sub)}.bar{height:9px;background:#e9ecf5;border-radius:999px;overflow:hidden;margin:6px 0 2px}.bar>i{display:block;height:100%;background:var(--grad);transition:.35s ease}.qmeta{display:flex;justify-content:space-between;color:var(--sub);font-size:.85rem;font-weight:700;margin-bottom:10px;gap:8px}#qProgress{font-weight:800;color:var(--accent)}.qtext{font-size:1.18rem;font-weight:700;margin:12px 0 10px;white-space:pre-wrap;line-height:1.7}.qimg{display:block;max-width:100%;border-radius:12px;border:1px solid var(--line);margin:6px 0 12px;background:#fff}.hint{color:var(--accent);font-size:.86rem;margin:0 0 14px;font-weight:700}.opt{display:block;width:100%;text-align:left;background:#fff;color:var(--txt);border:1.5px solid var(--line);border-radius:14px;padding:15px 16px;margin:9px 0;font-size:1.04rem;line-height:1.65;white-space:pre-wrap;word-break:break-word;transition:.14s}.opt:hover{border-color:var(--accent);background:var(--card2)}.opt.sel{border-color:var(--accent);background:#eef0fe}.opt.correct{background:#e9f8ee;border-color:var(--ok)}.opt.wrong{background:#fdeaef;border-color:var(--ng)}.opt:disabled{cursor:default}.opt .mk{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:26px;margin-right:10px;border-radius:8px;background:var(--card2);color:var(--accent);font-weight:800;font-size:.85rem}textarea.ans{width:100%;background:#fff;color:var(--txt);border:1.5px solid var(--line);border-radius:14px;padding:13px 14px;font-size:1rem;font-family:inherit;resize:vertical;min-height:52px}textarea.ans:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #6366f126}.expl{background:var(--card2);border-left:4px solid var(--accent);border-radius:12px;padding:13px 15px;margin-top:15px;white-space:pre-wrap;font-size:.98rem;line-height:1.7;word-break:break-word}.nav{display:flex;gap:10px;margin-top:18px}.nav button{flex:1;border-radius:14px;padding:14px;font-size:1rem;font-weight:700;border:1px solid var(--line);background:#fff;color:var(--txt)}.nav .primary{flex:2}.result-num{font-size:2.6rem;font-weight:900;text-align:center;margin:6px 0;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.result-num span{color:var(--sub);font-size:1rem;-webkit-text-fill-color:initial}.link{color:var(--accent);background:none;border:none;font-size:.9rem;font-weight:600;padding:6px}.link:hover{text-decoration:underline}.badge{display:inline-block;background:var(--card2);border:1px solid var(--line);border-radius:999px;padding:3px 12px;font-size:.8rem;font-weight:700;color:var(--accent);white-space:nowrap}.loginput{display:block;width:100%;background:#fff;color:var(--txt);border:1.5px solid var(--line);border-radius:14px;padding:14px 15px;margin:9px 0;font-size:1rem;font-family:inherit}.loginput:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #6366f126}.loginerr{color:var(--ng);font-size:.85rem;margin:6px 0;font-weight:600}.flagbtn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:4px 12px;font-size:.8rem;font-weight:700;color:var(--sub);white-space:nowrap}.flagbtn.on{background:#fff7ed;border-color:#f59e0b;color:#b45309}.quizrow{display:flex;gap:12px;align-items:flex-start}.quizrow>.card{flex:1 1 auto;min-width:0}.qjump{flex:0 0 78px;display:grid;grid-template-columns:repeat(2,1fr);gap:5px;align-content:flex-start;position:sticky;top:66px;max-height:calc(100vh - 92px);overflow-y:auto;overflow-x:hidden;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:8px 7px;box-shadow:var(--shadow);margin-top:15px}.jchip{width:100%;height:28px;border-radius:8px;border:1.5px solid var(--line);background:#fff;color:var(--txt);font-size:.72rem;font-weight:700;display:flex;align-items:center;justify-content:center;position:relative}.jchip.cur{border-color:var(--accent);box-shadow:0 0 0 3px #6366f147}.jchip.ok{background:#e9f8ee;border-color:var(--ok);color:#166534}.jchip.ng{background:#fdeaef;border-color:var(--ng);color:#9f1239}.jchip.flag:after{content:"🚩";position:absolute;top:-6px;right:-4px;font-size:.6rem}.toast{position:fixed;left:50%;bottom:20px;transform:translate(-50%);background:#0f172a;color:#fff;border-radius:12px;padding:11px 18px;font-size:.85rem;font-weight:600;box-shadow:0 8px 24px #0f172a4d;z-index:50}