:root{--navy:#192f46;--navy-2:#2b4864;--blue:#365cea;--bg:#f4f6f9;--ink:#243449;--muted:#708091;--line:#e2e7ef;--green:#13725e;--red:#b83b44;--radius:14px;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Noto Sans CJK SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}[hidden]{display:none!important}.header{height:88px;display:flex;align-items:center;justify-content:space-between;gap:24px;background:white;padding:0 4%;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:23px;letter-spacing:-1px;white-space:nowrap}.brand:hover{text-decoration:none}.brand-icon{display:grid;place-items:center;background:var(--navy);color:white;border-radius:12px;width:44px;height:46px;font-family:serif;font-size:27px}.brand small{display:block;font-size:12px;letter-spacing:1px;font-weight:500;margin-top:3px;color:var(--muted)}nav{display:flex;gap:34px;height:100%}.nav{border:0;border-bottom:3px solid transparent;background:none;color:var(--muted);padding:4px 0 0;font-size:15px}.nav.active{color:var(--navy);font-weight:650;border-color:var(--navy)}.button{min-height:43px;display:inline-flex;align-items:center;justify-content:center;gap:16px;border:1px solid transparent;border-radius:8px;padding:11px 18px;font-weight:600;font-size:14px;transition:background .15s}.button.primary{background:var(--navy);color:white}.button.primary:hover{background:var(--navy-2)}.button.secondary{background:white;border-color:var(--line);color:var(--ink)}.button.secondary:hover{background:#eef2f7}.full{width:100%}.text-button{border:none;background:transparent;color:var(--blue);padding:5px 0;font-size:14px}.edition-bar{background:var(--navy);color:#cdd9e4;display:flex;justify-content:space-between;gap:20px;padding:12px 4%;font-size:13px}.edition-bar b{color:#cbe5de;font-size:12px;letter-spacing:1px;border:1px solid #577081;border-radius:5px;padding:3px 7px;margin-right:14px}.edition-bar a{font-size:12px;color:#d1dce9}main{max-width:1600px;margin:0 auto;padding:36px 4% 50px}.page-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:31px;gap:20px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted);font-weight:650;margin:0 0 12px}h1{font-size:29px;letter-spacing:-.8px;line-height:1.4;margin:0 0 10px}h2{font-size:18px;line-height:1.4;margin:0 0 20px}h3{font-size:15px;margin:0 0 14px}.muted{color:var(--muted);font-size:14px;line-height:1.75;margin:0}.heading-note{text-align:right;padding-right:5px}.small-label{color:var(--muted);font-size:12px}.heading-note strong{display:block;font-size:34px;font-weight:600;font-variant-numeric:tabular-nums;margin-top:4px}.heading-note small{font-size:13px;font-weight:400;margin-left:8px;color:var(--muted)}.workspace{display:grid;grid-template-columns:228px minmax(350px,1fr) 220px;gap:23px;align-items:start}.filter-panel,.question-card,.progress-panel,.surface{border:1px solid var(--line);border-radius:var(--radius);background:white;box-shadow:0 4px 16px #1a365403}.filter-panel{padding:23px 20px}.panel-heading{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:20px}.panel-heading h2{font-size:16px;margin:0}label{display:block;font-size:14px;font-weight:500;margin:0 0 19px;line-height:1.5}input:not([type=checkbox]):not([type=radio]),select,textarea{display:block;width:100%;min-height:43px;background:#fff;border:1px solid #dce2ea;border-radius:7px;padding:10px 12px;font-size:14px;color:var(--ink);margin-top:8px}textarea{line-height:1.65;resize:vertical}input::placeholder{color:#939fad}select{padding-right:18px}.divider{height:1px;background:var(--line);margin:23px 0}.switch-row{display:flex;align-items:center;justify-content:space-between;gap:10px;font-weight:450}.switch-row small{display:block;color:var(--muted);font-size:12px;margin-top:5px}.switch-row input{appearance:none;width:32px;height:19px;background:#d8dfe8;border-radius:20px;position:relative;cursor:pointer;flex-shrink:0;margin:0}.switch-row input:before{content:"";height:13px;width:13px;background:white;position:absolute;top:3px;left:3px;border-radius:50%;box-shadow:0 1px 2px #0002;transition:transform .15s}.switch-row input:checked{background:var(--blue)}.switch-row input:checked:before{transform:translateX(13px)}.filter-result{font-size:13px;color:var(--muted);margin:26px 0 12px}.filter-result b{color:var(--ink)}.footnote{font-size:12px;color:var(--muted);line-height:1.8;margin:15px 0 0}.question-column{min-width:0}.notice{padding:13px 17px;border:1px solid #dce5f3;background:#edf2fb;border-radius:9px;font-size:12px;line-height:1.7;margin-bottom:16px}.notice .text-button{font-size:12px;display:block;margin-top:5px}.question-card{overflow:hidden}.question-top{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:21px 28px;border-bottom:1px solid var(--line);font-size:13px}.question-id{font-weight:700;letter-spacing:.7px}.badge{display:inline-block;padding:4px 8px;border-radius:5px;background:#edf1f6;color:#65788d;font-size:12px;font-weight:500}.badge.green{background:#e7f3ef;color:var(--green)}.badge.red{background:#fff0f1;color:var(--red)}.badge.amber{background:#fff5dc;color:#956421}.question-body{padding:29px}.question-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:20px}.question-stem{font-size:18px;line-height:1.95;font-weight:500;white-space:pre-wrap;overflow-wrap:anywhere;margin:0 0 25px;color:#203248;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif}.question-hint{font-size:13px;color:var(--muted);margin:0 0 13px}.options{display:grid;gap:11px}.option{display:flex;align-items:flex-start;gap:15px;position:relative;border:1px solid var(--line);border-radius:9px;padding:15px 17px;cursor:pointer;font-size:15px;line-height:1.7;margin:0;transition:background .12s,border-color .12s;font-weight:400}.option:hover{background:#f7f9fd;border-color:#b2c0d9}.option input{position:absolute;opacity:0;inset:0;width:100%;height:100%;cursor:pointer;margin:0}.option:has(input:focus-visible){outline:2px solid var(--blue);outline-offset:3px}.option-letter{height:27px;width:27px;border:1px solid #d9e0e9;border-radius:6px;text-align:center;flex:0 0 27px;font-size:12px;font-weight:650;line-height:25px;color:var(--muted);background:#f8fafc}.option.selected{background:#edf2fc;border-color:#6484d7}.option.selected .option-letter{background:var(--blue);color:white;border-color:var(--blue)}.option.correct{background:#eaf5ef;border-color:#72ae94}.option.wrong{background:#fff0f1;border-color:#df8d95}.option.correct .option-letter{background:var(--green);color:white;border-color:var(--green)}.option.wrong .option-letter{background:var(--red);color:white;border-color:var(--red)}.question-action{margin-top:28px;display:flex;align-items:center;justify-content:space-between;gap:12px}.question-action .muted{font-size:12px}.question-source{padding:16px 29px;background:#fafbfd;border-top:1px solid var(--line);font-size:12px;line-height:1.8;color:var(--muted);display:flex;justify-content:space-between;gap:16px}.question-source a{color:var(--navy-2)}.question-navigation{display:flex;align-items:center;justify-content:space-between;margin:20px 0 30px;gap:15px}.question-navigation span{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}.previous-panel{padding:0 5px}.history-entry{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.progress-panel{padding:25px 21px}.progress-panel h2{font-size:17px}.progress-ring{width:145px;height:145px;background:conic-gradient(var(--blue) 0deg,#edf1f6 0deg);border-radius:50%;margin:23px auto 26px;display:grid;place-items:center}.progress-ring>div{height:128px;width:128px;background:white;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px}.progress-ring strong{font-size:28px;font-weight:550;font-variant-numeric:tabular-nums}.progress-ring span{font-size:12px;color:var(--muted)}.stats-list{margin:0 0 24px}.stats-list div{display:flex;justify-content:space-between;align-items:center;margin:17px 0;font-size:13px}.stats-list dt{color:var(--muted)}.stats-list dd{font-size:17px;font-weight:550;margin:0}.source-note{border-top:1px solid var(--line);margin-top:25px;padding-top:23px}.source-note span{font-size:12px;letter-spacing:.7px;color:var(--muted)}.source-note p{font-size:13px;line-height:1.8;margin:10px 0 0}.answer-panel{border-top:1px solid var(--line);margin-top:25px;padding-top:25px}.result-title{font-size:20px;font-weight:650;margin:0 0 12px;color:var(--green)}.result-title.wrong{color:var(--red)}.explanation{white-space:pre-wrap;font-size:15px;line-height:1.9;margin-top:14px}.answer-info{font-size:14px;line-height:1.8}.reference-list{font-size:12px;line-height:1.8;overflow-wrap:anywhere;padding-left:18px}.reference-list a{color:var(--blue)}details{margin:18px 0;color:var(--muted);font-size:13px}summary{cursor:pointer;margin-bottom:10px}.original-image{width:100%;height:auto;border:1px solid var(--line);border-radius:7px;margin:5px 0}.loading,.empty{text-align:center;padding:60px 22px;color:var(--muted);font-size:14px;line-height:2}.surface{padding:28px;overflow:hidden}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}th{font-weight:500;color:var(--muted);font-size:12px;padding:14px 12px;background:#f8fafc}td{padding:17px 12px;border-bottom:1px solid var(--line);line-height:1.65}td small{display:block;color:var(--muted);font-size:12px}.table-button{background:none;border:0;color:var(--blue);padding:0;font-size:13px}.admin-tabs{display:flex;gap:25px;border-bottom:1px solid var(--line);margin-bottom:23px}.admin-tabs button{padding:12px 0;background:none;border:0;border-bottom:2px solid transparent;color:var(--muted);font-size:14px}.admin-tabs button.active{color:var(--navy);border-color:var(--navy);font-weight:600}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:24px;flex-wrap:wrap}.toolbar input{max-width:300px;margin:0!important}.upload-layout{display:grid;grid-template-columns:minmax(240px,360px) 1fr;gap:32px}.upload-box{padding:22px;border:1px dashed #aebed4;border-radius:12px;background:#f8fafc}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 18px}.upload-log{font-size:13px;white-space:pre-wrap;line-height:1.8;color:var(--muted);max-height:500px;overflow:auto}footer{max-width:1600px;margin:0 auto;padding:24px 4%;border-top:1px solid var(--line);color:var(--muted);display:flex;justify-content:space-between;gap:20px;font-size:12px;line-height:1.8}footer>span:first-child{font-size:15px;font-weight:650;color:var(--navy)}dialog{border:1px solid var(--line);border-radius:16px;width:min(440px,calc(100vw - 32px));padding:35px;box-shadow:0 30px 100px #10284040;color:var(--ink);max-height:90vh}dialog::backdrop{background:#15273c80;backdrop-filter:blur(3px)}dialog h2{font-size:24px;margin:0 0 9px}dialog form>.muted{margin-bottom:25px}.close{position:absolute;top:13px;right:16px;border:0;background:none;font-size:26px;color:var(--muted)}.form-error{color:var(--red);font-size:13px;line-height:1.7}.wide-dialog{width:min(720px,calc(100vw - 32px))}.wide-dialog h2{margin-bottom:24px}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);max-width:90vw;padding:14px 22px;background:var(--navy);color:#fff;border-radius:10px;font-size:14px;box-shadow:0 5px 25px #10284030;z-index:100}.account-email{font-size:12px;color:var(--muted);margin-right:12px;max-width:180px;display:inline-block;overflow:hidden;text-overflow:ellipsis;vertical-align:middle}.student-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:24px}.metric{padding:20px;background:#f5f8fc;border-radius:10px}.metric span{display:block;color:var(--muted);font-size:13px}.metric b{display:block;font-size:27px;margin-top:12px}.admin-subtitle{font-size:15px;margin:26px 0 12px}.status-line{font-size:13px;line-height:1.8;padding:12px;background:#edf2fb;border-radius:7px;margin:15px 0}.auth-notice{margin:0 0 20px}.numeric-answer{max-width:220px}.error-box{color:var(--red);padding:30px;line-height:1.8}.upload-warning{font-size:13px;line-height:1.8;color:#856020;background:#fff8e8;padding:14px;border-radius:8px;margin-bottom:20px}
@media(min-width:1450px){.workspace{grid-template-columns:246px minmax(400px,1fr) 240px;gap:29px}.question-body{padding:35px}.question-top{padding:23px 35px}.question-stem{font-size:19px}}@media(max-width:1150px){.workspace{grid-template-columns:210px minmax(340px,1fr)}.progress-panel{display:none}nav{gap:23px}.header{padding:0 3%;gap:15px}main{padding-left:3%;padding-right:3%}}@media(max-width:760px){.header{height:auto;min-height:82px;flex-wrap:wrap;padding:17px 5% 0;gap:15px}.brand{font-size:21px}.brand-icon{width:38px;height:40px}.brand small{font-size:10px}nav{order:3;width:100%;height:43px;gap:27px}.nav{font-size:14px}.header #account{margin-left:auto}.header .button{font-size:12px;padding:8px 12px;min-height:36px}.account-email{display:none}.edition-bar{padding:12px 5%;font-size:12px}.edition-bar a{font-size:11px}.edition-bar b{margin-right:6px}main{padding:28px 5%}.page-heading{margin-bottom:23px}h1{font-size:24px}.heading-note strong{font-size:28px}.workspace{display:block}.filter-panel{margin-bottom:20px;display:grid;grid-template-columns:1fr 1fr;gap:0 15px;padding:20px}.filter-panel label{margin-bottom:14px;font-size:13px}.filter-panel select,.filter-panel input{font-size:13px}.panel-heading{grid-column:1/-1}.filter-panel .divider{grid-column:1/-1;margin:5px 0 17px}.filter-panel .switch-row{grid-column:1/-1}.filter-panel .filter-result{grid-column:1;margin:12px 0}.filter-panel .button{grid-column:2}.filter-panel .footnote{grid-column:1/-1;font-size:11px}.question-body{padding:23px}.question-top{padding:17px 23px}.question-stem{font-size:17px}.option{font-size:15px;padding:13px 12px;gap:12px}.question-action{align-items:flex-start;flex-direction:column}.question-action .button{width:100%}.question-source{padding:14px 23px;flex-direction:column;gap:5px}.surface{padding:18px}.upload-layout{grid-template-columns:1fr}footer{padding:22px 5%;flex-direction:column;gap:5px}.student-stats{gap:8px}.metric{padding:14px}.metric b{font-size:24px}dialog{padding:30px 23px}.form-grid{gap:0 12px}.page-heading .muted{font-size:12px}.eyebrow{font-size:10px}.question-hint{font-size:12px}.previous-panel{margin-top:26px}}