:root{--blue:#246bfd;--ink:#1d2c45;--muted:#738097;--line:#e6ebf3;--bg:#f5f7fb;--soft:#edf3ff;--green:#21876b;font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);font-size:15px;line-height:1.65;background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}a{color:var(--blue);text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #90b6ff}button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px 18px;color:var(--ink);font-weight:600;transition:background .15s,box-shadow .15s}button:hover{background:#f4f7fe}.primary{background:var(--blue);border-color:var(--blue);color:#fff}.primary:hover{background:#1659e7}.quiet{background:transparent;border-color:transparent;color:var(--muted)}.danger{color:#ad3b3b}.small{padding:7px 12px;font-size:13px}.full{width:100%}h1,h2,h3,p{margin-top:0}h1{font-size:36px;line-height:1.3;letter-spacing:-1px;margin-bottom:18px;font-weight:650}h2{font-size:22px;line-height:1.45;font-weight:650}h3{font-size:16px;font-weight:650}p{margin-bottom:14px}.muted,small{color:var(--muted)}small{font-size:12px}.brand{display:flex;gap:11px;align-items:center;font-size:18px;font-weight:650;color:var(--ink);white-space:nowrap}.logo{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--blue);color:#fff;font-size:20px}.brand small{font-size:12px;font-weight:400;display:block;line-height:1.2}.topbar{height:78px;background:#ffffffed;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(28px,calc((100vw - 1180px)/2));gap:20px}.topbar .right{display:flex;align-items:center;gap:20px}.pill{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:550;border-radius:7px;padding:4px 9px;background:var(--soft);color:#4265a2;white-space:nowrap}.pill.success{background:#e9f6ef;color:#21876b}.eyebrow{color:var(--blue);font-size:12px;font-weight:650;letter-spacing:2px;margin-bottom:18px}.landing{max-width:1180px;margin:54px auto 24px;padding:0 28px}.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:center}.hero-copy{padding:22px 0}.hero-copy>p{font-size:16px;max-width:470px;line-height:1.9;color:#65738a}.stats{display:flex;gap:0;margin:32px 0;border-top:1px solid var(--line);padding-top:26px}.stats>div{padding:0 26px;border-right:1px solid var(--line)}.stats>div:first-child{padding-left:0}.stats>div:last-child{border:0}.stats b{font-size:26px;font-weight:600;display:block;color:#253a5e}.stats span{font-size:12px;color:var(--muted)}.card{background:white;border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:0 6px 20px #263a6010}.entry-card{padding:32px;box-shadow:0 16px 45px #2b4e8c0c}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}label{display:block;font-size:13px;font-weight:550;margin-bottom:16px}input,select,textarea{display:block;width:100%;margin-top:7px;border:1px solid #dce3ef;border-radius:9px;padding:11px 12px;background:#fff;color:var(--ink);font-size:14px}input::placeholder,textarea::placeholder{color:#a2adbd}textarea{min-height:100px;resize:vertical}.check{display:flex;align-items:flex-start;gap:9px;font-size:12px;color:var(--muted);font-weight:400;line-height:1.65}.check input{width:17px;height:17px;margin:3px 0 0;flex:none}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:45px}.step{border-top:1px solid #dce4f2;padding:24px 10px 20px 0}.step-num{font-size:12px;font-weight:600;color:var(--blue);margin-bottom:12px}.step p{font-size:13px;color:var(--muted)}footer{max-width:1180px;padding:28px;margin:0 auto;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:12px}.notice{background:#f4f7fc;border-radius:10px;padding:14px 16px;color:#66738b;font-size:13px;line-height:1.8}.notice.warn{background:#fff6e6;color:#8e6c30}.workspace{max-width:1360px;margin:30px auto;padding:0 28px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:0 0 26px}.page-heading h1{font-size:27px;margin-bottom:5px}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.exam-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:24px;align-items:start}.exam-side{position:sticky;top:24px}.exam-side.card{padding:21px}.nav-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin:12px 0 22px}.nav-grid button{padding:7px 0;border-radius:7px;font-size:12px;position:relative}.nav-grid button.answered{background:#edf4ff;color:var(--blue);border-color:#d4e3ff}.nav-grid button.active{background:var(--blue);border-color:var(--blue);color:white}.nav-grid button.flag::after{content:"";position:absolute;width:6px;height:6px;border-radius:50%;background:#e7a735;right:3px;top:3px}.exam-main{min-width:0}.question-card{padding:32px}.question-head{display:flex;justify-content:space-between;gap:14px;margin-bottom:22px}.question-head h2{margin:8px 0 0}.section-id{color:var(--blue);font-size:12px;font-weight:650;letter-spacing:1px}.context{border-left:3px solid #c5d7fa;padding:16px 20px;background:#f7f9fd;font-size:15px;line-height:1.95;white-space:pre-line;border-radius:0 9px 9px 0}.question-body{margin-top:26px}.material{padding:0;border-radius:12px;overflow:hidden;width:100%;margin:20px 0 4px;background:#fff;display:block;border:1px solid var(--line)}.material img{display:block;width:100%;height:auto}.material-label{font-size:12px;color:var(--muted);margin-bottom:22px}.options{display:grid;gap:12px;margin:18px 0 26px}.option{display:flex;align-items:flex-start;gap:14px;padding:17px;text-align:left;font-weight:400;font-size:15px;line-height:1.8}.option .letter{width:28px;height:28px;flex:none;display:grid;place-items:center;border-radius:7px;background:#f2f5f9;font-size:12px;font-weight:600;line-height:1.2}.option.selected{border-color:var(--blue);background:#f1f6ff;box-shadow:0 0 0 1px var(--blue)}.option.selected .letter{color:white;background:var(--blue)}.bottom-nav{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);padding-top:22px}.timer{font-variant-numeric:tabular-nums;font-size:18px;letter-spacing:1px;font-weight:600}.timer.urgent{color:#b63e38}.save-state{font-size:12px;color:var(--muted);margin-right:12px}.success-panel{max-width:600px;margin:80px auto;text-align:center;padding:48px}.success-icon{border-radius:50%;background:#e8f6ef;color:var(--green);font-size:36px;width:80px;height:80px;margin:0 auto 24px}.admin-shell{display:grid;grid-template-columns:210px 1fr;min-height:calc(100vh - 78px)}.admin-nav{padding:30px 18px;background:white;border-right:1px solid var(--line)}.admin-nav button{display:block;text-align:left;width:100%;margin-bottom:8px;border:0;color:var(--muted);font-weight:500}.admin-nav button.active{background:var(--soft);color:var(--blue)}.admin-nav small{display:block;padding:20px 16px}.admin-main{padding:34px;min-width:0;max-width:1500px;width:100%;margin:0 auto}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:24px 0}.metric{padding:21px 24px}.metric b{display:block;font-size:30px;margin-top:6px;font-weight:600}.metric small{color:var(--muted)}.toolbar{display:flex;align-items:center;gap:12px;margin:20px 0;flex-wrap:wrap}.toolbar input,.toolbar select{width:auto;margin:0;min-width:160px}.table-wrap{overflow-x:auto;background:white;border:1px solid var(--line);border-radius:14px}table{width:100%;border-collapse:collapse;white-space:nowrap;font-size:13px}th{text-align:left;color:#7b8799;background:#fafbfd;font-weight:500;padding:15px 20px}td{padding:17px 20px;border-top:1px solid #eef1f6}td b{font-weight:600}.empty{padding:65px 20px;text-align:center;color:var(--muted)}.split{display:grid;grid-template-columns:1fr 1fr;gap:24px}.score-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:22px 0}.score-grid>div{background:#f5f8fd;border-radius:12px;padding:18px}.score-grid b{font-size:25px;display:block}.score-grid small{display:block}.score-grid progress{width:100%;height:6px;display:block;margin-top:12px;accent-color:var(--blue)}.practical-fields{display:grid;grid-template-columns:repeat(2,1fr);gap:0 16px}.practical-fields small{display:block;font-weight:400;line-height:1.5;margin-top:5px}.report-section{margin-top:24px}.answer-detail{border-bottom:1px solid var(--line);padding:17px 0}.answer-detail summary{cursor:pointer;font-weight:550}.answer-detail p{font-size:13px;color:var(--muted);margin:15px 0}.answer-detail li{font-size:13px;margin:10px 0}.answer-detail li.chosen{color:var(--blue);font-weight:550}.code-list{font-family:ui-monospace,monospace;background:#f3f6fc;padding:18px;border-radius:10px;overflow:auto;line-height:2;max-height:320px;white-space:pre}.batch-card{margin-bottom:16px}.batch-card h3{margin-bottom:6px}.login{max-width:430px;margin:75px auto}.loading{text-align:center;padding:80px;color:var(--muted)}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#24344f;color:white;max-width:90vw;padding:12px 22px;border-radius:12px;z-index:100;box-shadow:0 8px 30px #20355530;display:none}#toast.show{display:block}dialog{border:0;border-radius:20px;padding:30px;max-width:min(92vw,640px);max-height:90vh;color:var(--ink);box-shadow:0 20px 80px #1c315a30}dialog::backdrop{background:#14284555;backdrop-filter:blur(3px)}dialog .dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:25px}dialog.image-dialog{max-width:96vw;width:1100px}dialog img{width:100%;display:block}dialog .zoom-body{overflow:auto;max-height:70vh}dialog .zoom-body.zoom img{width:1500px;max-width:none}.report-title{display:flex;justify-content:space-between;align-items:center}.big-score{font-size:40px;line-height:1.2;color:var(--blue);font-weight:600}.big-score small{font-size:14px}.badge-line{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.privacy{max-width:700px;line-height:1.9}.bank-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.bank-grid .card{padding:20px}.bank-grid h3{margin-bottom:8px}.subtle-link{font-size:13px}.review-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}.review-grid button{padding:9px 2px;font-size:13px}.review-grid .missing{border-color:#e8c582;background:#fff9ed}.review-grid .done{background:var(--soft);color:var(--blue)}.plain-list{padding-left:20px;color:#65738a;font-size:14px}.plain-list li{margin:8px 0}
@media(min-width:1400px){.landing{margin-top:85px}.hero{gap:100px}.hero h1{font-size:43px}}
@media(max-width:900px){.hero{gap:30px}.admin-shell{grid-template-columns:160px 1fr}.admin-main{padding:24px}.metrics,.score-grid{grid-template-columns:repeat(2,1fr)}.split{grid-template-columns:1fr}.exam-layout{grid-template-columns:160px minmax(0,1fr)}.question-card{padding:24px}.nav-grid{grid-template-columns:repeat(3,1fr)}.topbar{padding:0 24px}.stats>div{padding:0 18px}}
@media(max-width:640px){h1{font-size:30px}.topbar{height:68px;padding:0 18px}.topbar .right{gap:7px}.brand{font-size:16px}.topbar .pill{display:none}.landing{margin:25px auto;padding:0 20px}.hero{grid-template-columns:1fr;gap:18px}.hero-copy{padding:10px 0}.hero-copy h1{font-size:32px}.hero-copy>p{font-size:14px}.stats{margin:20px 0 0;padding-top:18px;justify-content:space-between}.stats b{font-size:24px}.entry-card{padding:24px}.steps{grid-template-columns:1fr;margin-top:28px;gap:0}.step{padding:18px 0}.step-num{float:left;width:40px;margin-top:3px}.step h3,.step p{margin-left:40px}.step p{margin-bottom:0}footer{padding:20px;flex-direction:column;gap:8px}.workspace{margin:20px auto;padding:0 14px}.exam-layout{display:flex;flex-direction:column-reverse}.exam-side{position:static;width:100%}.exam-side .nav-grid{grid-template-columns:repeat(8,1fr)}.exam-main{width:100%}.question-card{padding:22px 18px}.question-head h2{font-size:20px}.context{padding:13px 15px;font-size:14px}.option{padding:14px 12px;font-size:14px}.bottom-nav{flex-wrap:wrap}.page-heading{align-items:flex-start;gap:10px}.page-heading h1{font-size:23px}.page-heading .muted{font-size:12px}.page-heading .actions{gap:4px}.admin-shell{display:block}.admin-nav{display:flex;padding:10px 12px;overflow:auto;gap:5px;border-bottom:1px solid var(--line)}.admin-nav button{white-space:nowrap;width:auto;margin:0;padding:9px 12px;font-size:13px}.admin-nav small{display:none}.admin-main{padding:22px 16px}.card{padding:22px}.metrics{gap:10px}.metric{padding:15px}.metric b{font-size:24px}.bank-grid{grid-template-columns:1fr}.login{margin:40px 20px}.success-panel{margin:40px 20px;padding:30px}.report-title{gap:15px}.big-score{font-size:32px}.form-grid{grid-template-columns:1fr 1fr}.timer{font-size:16px}}
@media print{body{background:white;font-size:12px}.topbar,.admin-nav,.page-heading,.no-print,#toast,dialog{display:none!important}.admin-shell{display:block}.admin-main{padding:0}.card{box-shadow:none;border:0;padding:10px}.report-section{break-inside:avoid}.score-grid{grid-template-columns:repeat(4,1fr)}.answer-detail{break-inside:avoid}.split{display:block}.practical-editor{display:none}.report-section p{color:#333}.print-only{display:block}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
