:root{--navy:#0d3b66;--blue:#1976a8;--ink:#12212b;--muted:#60727c;--line:#d9e3e7;--paper:#f5f7f5;--white:#fff;--gold:#e7a83b;--green:#24745b;--red:#b64c43}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.55}.top{height:78px;padding:16px max(20px,calc((100% - 980px)/2));display:flex;align-items:center;justify-content:space-between;background:var(--navy);color:white}.top h1{font-size:20px;margin:0;font-weight:700;letter-spacing:0}.top-actions{display:flex;gap:8px;align-items:center}.eyebrow{font-size:10px;letter-spacing:1.5px;color:var(--gold);font-weight:700}.icon-btn,.reset-btn{background:transparent;border:1px solid #ffffff66;color:#fff;padding:8px 12px;border-radius:6px}.reset-btn{border-color:#e7a83b;color:#ffd27c}.hero,main{max-width:980px;margin:auto}.hero{margin-top:22px;background:#e5eef0;min-height:190px;padding:28px 30px;display:flex;justify-content:space-between;align-items:center;border-left:6px solid var(--blue)}h2{font-size:24px;line-height:1.3;margin:4px 0 8px;letter-spacing:0}.hero h2{font-size:31px}.muted{color:var(--muted);font-size:14px}.hero-mark{width:98px;height:98px;border:1px solid var(--blue);border-radius:50%;display:grid;place-content:center;text-align:center;font-size:38px;font-weight:800;color:var(--blue);line-height:1}.hero-mark span{font-size:11px;font-weight:500}.tabs{max-width:980px;margin:24px auto 0;display:flex;border-bottom:1px solid var(--line);gap:24px}.tabs button{background:none;border:0;padding:12px 2px;font-size:15px;color:var(--muted);cursor:pointer}.tabs button.active{color:var(--blue);border-bottom:3px solid var(--blue);font-weight:700}.panel{padding:22px 0 40px}.hidden{display:none!important}.section-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:16px}.section-head h2{font-size:22px;margin:0}.count{font-size:13px;color:var(--muted)}.subject-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.subject{background:var(--white);border:1px solid var(--line);border-top:4px solid var(--blue);padding:17px 14px;min-height:150px;display:flex;flex-direction:column;cursor:pointer;transition:.15s}.subject:hover{transform:translateY(-2px);box-shadow:0 5px 15px #0d3b6618}.subject h3{margin:0 0 7px;font-size:16px}.subject p{font-size:12px;color:var(--muted);margin:0}.subject .go{margin-top:auto;color:var(--blue);font-weight:700;font-size:13px}.list{display:grid;gap:10px}.list-item{background:#fff;border:1px solid var(--line);padding:16px 18px;cursor:pointer}.list-item h3{margin:0 0 5px;font-size:16px}.list-item p{margin:3px 0;color:var(--muted);font-size:13px}.pill{display:inline-block;background:#e9f1f4;color:var(--blue);font-size:11px;padding:2px 7px;border-radius:12px;margin-right:6px}.modal{position:fixed;inset:0;background:#071b2dcc;display:grid;place-items:end center;padding:0}.modal-card{background:#fff;width:min(680px,100%);max-height:92vh;overflow:auto;padding:28px 22px 35px;position:relative;border-radius:12px 12px 0 0}.close{position:absolute;right:16px;top:12px;border:0;background:none;font-size:28px;color:var(--muted)}.quiz-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px;margin-bottom:15px}.quiz-toolbar{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px;margin:-5px 0 12px}.save-btn{border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:6px;padding:6px 9px}.quiz-stem{font-size:19px;font-weight:700;line-height:1.5;margin:10px 0 18px}.material-box{white-space:pre-line;background:#f4f7f6;border-left:4px solid var(--gold);padding:12px;margin:12px 0;color:#44545a;font-size:14px}.option{display:block;width:100%;text-align:left;background:#f7faf9;border:1px solid var(--line);padding:13px 14px;margin:9px 0;border-radius:7px;font-size:15px;color:var(--ink)}.option:active{background:#deedf2}.option.correct{border-color:var(--green);background:#e3f2ec}.option.wrong{border-color:var(--red);background:#fbe8e5}.feedback{margin-top:16px;padding:14px;border-left:4px solid var(--green);background:#f0f7f4}.feedback.wrong{border-color:var(--red);background:#fff3f1}.next-btn,.primary{background:var(--navy);color:#fff;border:0;padding:12px 20px;border-radius:6px;font-size:15px}.actions{display:flex;justify-content:flex-end;gap:9px;margin-top:18px}.timer{color:var(--red);font-weight:800;font-variant-numeric:tabular-nums}.paper-q{padding:14px 0;border-bottom:1px solid var(--line)}.paper-q .quiz-stem{font-size:16px;margin:0 0 8px}.question-label{font-size:12px;color:var(--blue);font-weight:700}.paper-actions{position:sticky;bottom:0;background:#fff;padding:14px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.score{font-size:35px;color:var(--blue);font-weight:800}.answer-area{display:block;width:100%;min-height:150px;border:1px solid var(--line);border-radius:7px;padding:12px;font:inherit;line-height:1.6;resize:vertical}.material-content{white-space:pre-line;font-size:15px}.material-meta{font-size:12px;color:var(--blue);margin:10px 0}.source{font-size:12px;color:var(--muted);margin-top:14px}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:14px 0 22px}.stat-grid div{background:#eef4f3;padding:12px;text-align:center}.stat-grid b{display:block;color:var(--blue);font-size:22px}.stat-grid span{color:var(--muted);font-size:12px}.stat-row{display:grid;grid-template-columns:1fr auto auto;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);font-size:13px}.stat-row b{color:var(--blue)}.stat-row small{color:var(--muted)}
@media(max-width:700px){.top{padding:15px 18px}.hero,main{width:auto;margin-left:16px;margin-right:16px}.hero{padding:22px 20px;min-height:175px}.hero h2{font-size:27px}.hero-mark{width:78px;height:78px;font-size:30px}.tabs{margin-left:16px;margin-right:16px;gap:14px;overflow-x:auto}.tabs button{font-size:14px;white-space:nowrap}.subject-grid{grid-template-columns:repeat(2,1fr);gap:9px}.subject{min-height:140px;padding:14px 12px}.panel{padding-top:18px}.modal-card{padding-left:18px;padding-right:18px}.quiz-stem{font-size:18px}.stat-grid{grid-template-columns:repeat(2,1fr)}}