:root{--bg:#f5f6f8;--card:#fff;--text:#17191c;--muted:#717780;--line:#e4e7eb;--primary:#1e3a5f;--primary2:#244d7e;--warn:#996400;--warnbg:#fff7df;--ok:#19724c;--okbg:#eaf8f1;--danger:#b22d2d;--dangerbg:#fff0f0;--shadow:0 8px 24px rgba(28,38,51,.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans KR",Arial,sans-serif;font-size:14px}.topbar{height:66px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(28px,calc((100vw - 1240px)/2));position:sticky;top:0;z-index:30}.brand{display:flex;align-items:baseline;gap:10px}.brand a{font-weight:800;font-size:19px;color:var(--primary);text-decoration:none}.brand span{color:var(--muted);font-size:12px}.topbar nav{display:flex;gap:6px}.topbar nav a{color:#42464d;text-decoration:none;padding:9px 12px;border-radius:8px}.topbar nav a:hover{background:#f0f3f6}.container{max-width:1240px;margin:0 auto;padding:32px 28px 70px}.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:20px}.page-head h1{font-size:27px;margin:0 0 7px}.page-head p{margin:0;color:var(--muted);line-height:1.55}.head-actions,.actions{display:flex;gap:8px;align-items:center}.actions{justify-content:flex-end}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid #cfd4da;background:#fff;color:#24282d;text-decoration:none;border-radius:9px;padding:9px 13px;font-weight:650;cursor:pointer;font-size:13px}.btn:hover{background:#f6f8fa}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary2)}.btn.small{padding:6px 9px;font-size:12px}.btn.danger{color:var(--danger);border-color:#e6b7b7;background:#fff}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:20px;margin-bottom:18px}.cards{display:grid;gap:14px;margin-bottom:18px}.cards.four{grid-template-columns:repeat(4,1fr)}.metric{margin:0;display:flex;flex-direction:column;gap:7px}.metric span{font-size:13px;color:var(--muted)}.metric strong{font-size:28px}.metric.warning strong{color:var(--warn)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:14px}.section-head h2,.form-card h2{font-size:17px;margin:0}.section-head a{color:var(--primary);font-weight:650;text-decoration:none}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse}th,td{padding:12px 10px;border-bottom:1px solid #edf0f2;text-align:left;white-space:nowrap}th{color:#6c727a;font-size:12px;font-weight:700;background:#fbfcfd}tbody tr:last-child td{border-bottom:0}.clickable{cursor:pointer}.clickable:hover td{background:#f7f9fb}.strong-link{color:var(--text);font-weight:750;text-decoration:none}.strong-link:hover{color:var(--primary)}.badge{display:inline-flex;padding:4px 7px;border-radius:999px;font-size:11px;font-weight:750}.badge.warn{color:var(--warn);background:var(--warnbg)}.badge.ok{color:var(--ok);background:var(--okbg)}.badge.auto{color:#315c8b;background:#edf4fb}.badge.danger{color:var(--danger);background:var(--dangerbg)}.muted{color:var(--muted)}.empty{padding:38px 10px;text-align:center;color:var(--muted)}.stack{display:flex;flex-direction:column;gap:0}.form-grid{display:grid;gap:14px}.form-grid.two{grid-template-columns:2fr 1fr}label{display:flex;flex-direction:column;gap:7px;font-weight:650}input,select{width:100%;border:1px solid #ccd2d8;background:#fff;border-radius:8px;padding:9px 10px;font:inherit;color:var(--text);outline:none}input:focus,select:focus{border-color:#7e9cbc;box-shadow:0 0 0 3px rgba(47,93,141,.10)}.inline-tools{margin-top:18px;padding-top:18px;border-top:1px solid var(--line);display:flex;align-items:end;gap:8px}.inline-tools label{flex-direction:row;align-items:center;gap:8px}.inline-tools input{width:90px}.inline-tools .total{margin-left:auto;color:var(--muted)}.inline-tools .total strong{color:var(--text);font-size:18px}.question-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.q-row{display:grid;grid-template-columns:34px 64px 70px 20px;align-items:center;gap:6px;padding:8px;border:1px solid #edf0f2;border-radius:9px}.qno{font-weight:800}.q-row input,.q-row select{padding:7px 8px}.compact-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.mini-q{border:1px solid #edf0f2;border-radius:9px;padding:9px;display:grid;grid-template-columns:30px 1fr 46px 48px;gap:5px;align-items:center;font-size:12px}.mini-q b{font-size:13px}.danger-zone{display:flex;justify-content:flex-end;margin-top:20px}.upload-card{padding:26px}.dropzone{border:2px dashed #b6c2cf;border-radius:13px;min-height:230px;display:flex;align-items:center;justify-content:center;text-align:center;padding:30px;cursor:pointer;background:#fbfcfd}.dropzone:hover{border-color:#6f8eae;background:#f7fafc}.dropzone input{display:none}.dropzone strong{font-size:18px}.dropzone span{font-weight:400;color:var(--muted);margin-top:7px}.dropzone em{font-style:normal;color:var(--primary);font-size:12px;margin-top:16px}.notice{margin-top:14px;padding:12px 14px;border-radius:9px;background:#f6f8fa;color:#545a62;line-height:1.6}.review-layout{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(420px,.9fr);gap:18px;align-items:start}.image-card{position:sticky;top:84px}.image-card img{display:block;width:100%;border:1px solid var(--line);border-radius:8px;background:#fff}.meta{margin-top:9px;color:var(--muted);font-size:12px}.score-big{display:flex;align-items:baseline;gap:5px}.score-big strong{font-size:34px;color:var(--primary)}.score-big span{font-size:16px;color:var(--muted)}.keyval{display:flex;justify-content:space-between;border-top:1px solid var(--line);margin-top:14px;padding-top:14px;color:var(--muted)}.keyval b{color:var(--text)}.review-questions{display:grid;grid-template-columns:1fr 1fr;gap:7px}.review-q{display:grid;grid-template-columns:1fr 72px auto;align-items:center;gap:8px;padding:8px 9px;border:1px solid #edf0f2;border-radius:9px}.review-q>div{display:flex;flex-direction:column}.review-q>div span{font-size:11px;color:var(--muted)}.review-q.uncertain,.review-q.multiple,.review-q.blank{background:#fffcf3}.two-col{display:grid;grid-template-columns:330px 1fr;gap:18px;align-items:start}.sticky-card{position:sticky;top:84px}.student-list{display:flex;flex-direction:column;gap:7px}.student-row{display:grid;grid-template-columns:1.1fr 1fr 1.4fr 50px 56px 56px;gap:7px;align-items:center}.flash-stack{margin-bottom:16px}.flash{padding:11px 14px;border-radius:9px;margin-bottom:7px;border:1px solid}.flash.success{background:var(--okbg);border-color:#bde2cf;color:var(--ok)}.flash.error{background:var(--dangerbg);border-color:#efc0c0;color:#8d2525}@media(max-width:960px){.cards.four{grid-template-columns:repeat(2,1fr)}.question-grid{grid-template-columns:repeat(2,1fr)}.compact-grid{grid-template-columns:repeat(2,1fr)}.review-layout,.two-col{grid-template-columns:1fr}.image-card,.sticky-card{position:static}.topbar nav a{padding:8px 7px}.brand span{display:none}}@media(max-width:640px){.container{padding:22px 14px 50px}.topbar{padding:0 14px}.topbar nav a:nth-child(3),.topbar nav a:nth-child(4){display:none}.page-head{flex-direction:column}.cards.four,.question-grid,.review-questions,.form-grid.two{grid-template-columns:1fr}.compact-grid{grid-template-columns:1fr}.student-row{grid-template-columns:1fr 1fr}.student-row input:nth-child(3){grid-column:1/-1}}

/* v5: 시험 입력 — 세로 10문항 × 최대 6열, 문항별 배점(위)/정답(아래) */
.question-grid.question-grid-vertical{display:grid;grid-template-rows:repeat(10,auto);grid-auto-flow:column;grid-auto-columns:minmax(132px,1fr);gap:10px;align-items:start;overflow-x:auto;padding-bottom:4px}
.question-grid-vertical .q-row.q-card{display:flex;flex-direction:column;gap:7px;min-width:132px;padding:10px;border:1px solid #e4e8ec;border-radius:10px;background:#fff}
.question-grid-vertical .qno{font-size:13px;font-weight:800;text-align:center;padding-bottom:5px;border-bottom:1px solid #eef1f4}
.question-grid-vertical .q-field{display:grid;grid-template-columns:34px 1fr;align-items:center;gap:6px;font-weight:650}
.question-grid-vertical .q-field span{font-size:11px;color:var(--muted);font-weight:700}
.question-grid-vertical .q-field input{min-width:0;width:100%;height:34px;padding:6px 8px;text-align:center;font-weight:750}
.question-grid-vertical .answer-input{font-size:15px}
@media(max-width:960px){.question-grid.question-grid-vertical{grid-template-rows:repeat(10,auto);grid-auto-flow:column;grid-auto-columns:132px}}
@media(max-width:640px){.question-grid.question-grid-vertical{display:grid;grid-template-rows:repeat(10,auto);grid-auto-flow:column;grid-auto-columns:126px;overflow-x:auto}.question-grid-vertical .q-row.q-card{min-width:126px}}

/* v7: 수기 답안 입력 — 한 열에 10문항, 숫자 입력 시 다음 문항 자동 이동 */
.manual-answer-grid{display:grid;grid-template-rows:repeat(10,auto);grid-auto-flow:column;grid-auto-columns:minmax(86px,1fr);gap:9px;overflow-x:auto;padding:3px 0 7px}
.manual-answer-cell{display:grid;grid-template-columns:42px 1fr;align-items:center;gap:7px;padding:7px 8px;border:1px solid #e6e9ed;border-radius:9px;background:#fff;font-weight:700}
.manual-answer-cell>span{font-size:12px;color:#555d66;text-align:right}
.manual-answer-input{height:34px;padding:5px 7px;text-align:center;font-size:16px;font-weight:800}
.manual-hint{margin-top:5px;font-size:12px}
.manual-counter{white-space:nowrap;color:var(--muted)}
.manual-counter strong{font-size:18px;color:var(--primary)}
.manual-summary p{color:var(--muted);line-height:1.65;margin:4px 0 22px}
@media(max-width:640px){.manual-answer-grid{grid-auto-columns:96px}.manual-answer-cell{grid-template-columns:38px 1fr;padding:6px}.manual-answer-cell>span{font-size:11px}}

/* v8: 문항별 오답률 / 선지 선택률 */
.analysis-table th,.analysis-table td{text-align:center;vertical-align:middle}
.analysis-table th:first-child,.analysis-table td:first-child{text-align:left}
.analysis-table td{min-width:74px}
.analysis-table .stat-count{display:block;margin-top:3px;font-size:10px;color:var(--muted);font-weight:500}
.analysis-table .correct-choice{background:#edf8f2;font-weight:750;color:#176b47}
.analysis-table .alert-stat{background:#fff0f0;font-weight:800;color:#b42318}
.analysis-table .alert-stat .stat-count{color:#b42318}
.analysis-alert-note{color:#b42318;font-weight:800}
.analysis-table tbody tr:hover td{background:#fafbfd}
.analysis-table tbody tr:hover td.correct-choice{background:#e6f5ed}
.analysis-table tbody tr:hover td.alert-stat{background:#ffe3e3}
@media(max-width:640px){.head-actions{flex-wrap:wrap}.analysis-table td{min-width:68px}}

/* v9: 반별 학생 관리 / 누적 성적 */
.cards.three{grid-template-columns:repeat(3,1fr)}
.class-toolbar{padding:17px 20px}.class-toolbar-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:14px}.class-toolbar-head h2{font-size:17px;margin:0 0 4px}.class-create-form{display:flex;gap:7px;align-items:center}.class-create-form input{width:210px}.class-tabs{display:flex;gap:7px;flex-wrap:wrap;align-items:center}.class-tab-wrap{display:inline-flex;align-items:center;border:1px solid #d7dce1;border-radius:9px;overflow:hidden;background:#fff}.class-tab{display:inline-flex;gap:6px;align-items:center;padding:8px 11px;text-decoration:none;color:#3b4148;font-size:13px;font-weight:700}.class-tab>span{color:var(--muted);font-size:11px}.class-tab.active{background:#eef4fa;color:var(--primary)}.class-tab-wrap .class-tab{border-radius:0}.class-delete{border:0;border-left:1px solid #e3e6e9;background:#fff;color:#9a5a5a;height:34px;width:30px;cursor:pointer;font-size:17px}.class-delete:hover{background:#fff2f2}.identity-note{font-size:11px;line-height:1.55;margin:4px 0 0}.student-management-layout{grid-template-columns:360px 1fr}.student-table th{padding:10px 7px}.student-edit-cell{padding:6px 0}.student-edit-grid{display:grid;grid-template-columns:130px 110px 1fr 105px 82px 1.2fr 116px;gap:6px;align-items:center}.student-edit-grid input,.student-edit-grid select{padding:7px 8px}.student-actions{display:flex;gap:5px;justify-content:flex-end}.history-link{display:inline-flex;justify-content:center;text-decoration:none;font-size:12px;font-weight:750;color:var(--primary);padding:7px 5px;border-radius:7px;background:#f2f6fa}.history-link:hover{background:#e8f0f8}.student-stat-cards .metric strong{font-size:25px}
@media(max-width:1100px){.student-management-layout{grid-template-columns:320px 1fr}.student-edit-grid{grid-template-columns:110px 100px 1fr 95px 74px 1fr}.student-actions{grid-column:1/-1}.student-table thead{display:none}}
@media(max-width:760px){.cards.three{grid-template-columns:1fr}.class-toolbar-head{align-items:stretch;flex-direction:column}.class-create-form input{width:100%}.student-management-layout{grid-template-columns:1fr}.student-edit-grid{grid-template-columns:1fr 1fr}.student-edit-grid>*{min-width:0}.student-edit-grid input[name="note"]{grid-column:1/-1}.student-actions{grid-column:1/-1}.history-link{min-height:36px;align-items:center}}

/* v16: 시험 정답/배점 입력칸 가독성 개선 */
.question-grid.question-grid-vertical{
  grid-auto-columns:minmax(182px,1fr);
  gap:12px;
}
.question-grid-vertical .q-row.q-card{
  min-width:182px;
  padding:12px;
  gap:9px;
}
.question-grid-vertical .qno{
  font-size:14px;
  padding-bottom:7px;
}
.question-grid-vertical .q-field{
  grid-template-columns:46px minmax(0,1fr);
  gap:8px;
}
.question-grid-vertical .q-field span{
  font-size:13px;
  white-space:nowrap;
}
.question-grid-vertical .q-field input{
  min-width:96px;
  height:42px;
  padding:7px 10px;
  font-size:16px;
  line-height:1.2;
  font-weight:800;
}
.question-grid-vertical .answer-input{
  font-size:18px;
}
@media(max-width:960px){
  .question-grid.question-grid-vertical{grid-auto-columns:176px}
  .question-grid-vertical .q-row.q-card{min-width:176px}
}
@media(max-width:640px){
  .question-grid.question-grid-vertical{grid-auto-columns:168px}
  .question-grid-vertical .q-row.q-card{min-width:168px;padding:10px}
  .question-grid-vertical .q-field{grid-template-columns:42px minmax(0,1fr)}
  .question-grid-vertical .q-field input{min-width:92px;height:40px;font-size:16px}
}

/* v19: 시험 정답/배점 입력칸 겹침 수정 — 라벨과 입력칸 완전 분리 */
.question-grid.question-grid-vertical{
  grid-auto-columns:minmax(156px,1fr);
  gap:14px;
  overflow-x:auto;
  align-items:start;
}
.question-grid-vertical .q-row.q-card{
  min-width:156px;
  padding:12px 13px 13px;
  gap:11px;
  overflow:hidden;
}
.question-grid-vertical .qno{
  font-size:14px;
  line-height:1.25;
  padding-bottom:8px;
  margin-bottom:1px;
}
.question-grid-vertical .q-field{
  display:flex;
  flex-direction:column;
  align-items:stretch;
  gap:5px;
  width:100%;
  min-width:0;
}
.question-grid-vertical .q-field span{
  display:block;
  width:100%;
  font-size:12px;
  line-height:1.2;
  color:var(--muted);
  white-space:normal;
  text-align:left;
}
.question-grid-vertical .q-field input{
  display:block;
  width:100%;
  min-width:0;
  max-width:100%;
  height:44px;
  padding:8px 10px;
  font-size:17px;
  line-height:1.2;
  text-align:center;
  font-weight:800;
}
.question-grid-vertical .answer-input{font-size:19px}
@media(max-width:960px){
  .question-grid.question-grid-vertical{grid-auto-columns:154px}
  .question-grid-vertical .q-row.q-card{min-width:154px}
}
@media(max-width:640px){
  .question-grid.question-grid-vertical{grid-auto-columns:148px;gap:10px}
  .question-grid-vertical .q-row.q-card{min-width:148px;padding:10px 11px}
  .question-grid-vertical .q-field input{height:42px;font-size:16px}
}


/* v20: 학생 등록/대량등록 좌측 패널을 하나의 sticky 묶음으로 처리 */
.student-management-layout > .student-side-stack{
  position:sticky;
  top:84px;
  align-self:start;
  max-height:calc(100vh - 100px);
  overflow-y:auto;
  padding-right:4px;
}
.student-management-layout > .student-side-stack .card{
  position:static;
}
@media(max-width:760px){
  .student-management-layout > .student-side-stack{
    position:static;
    max-height:none;
    overflow:visible;
    padding-right:0;
  }
}

/* v21: 시험별 성적 필터 / 정렬 */
.result-filter-panel{
  margin:10px 0 16px;
  padding:14px;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(248,250,252,.72);
}
.result-filter-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(150px,1fr));
  gap:10px 12px;
  align-items:end;
}
.result-filter-grid label{display:flex;flex-direction:column;gap:5px;min-width:0}
.result-filter-grid label>span{font-size:12px;color:var(--muted);font-weight:700}
.result-filter-grid input,.result-filter-grid select{width:100%;height:40px;min-width:0}
.result-filter-actions{display:flex;align-items:end;height:40px}
.result-filter-actions .btn{width:100%;height:40px}
.result-filter-summary{margin-top:10px;font-size:13px;color:var(--muted)}
@media(max-width:1000px){.result-filter-grid{grid-template-columns:repeat(2,minmax(150px,1fr))}}
@media(max-width:600px){.result-filter-grid{grid-template-columns:1fr}.result-filter-actions{height:auto}}

/* v23: 채점 검수 문항별 정오답 시각화 */
.review-q{
  transition:background-color .15s ease,border-color .15s ease,box-shadow .15s ease;
  border-width:1px;
}
.review-q.result-correct{
  background:#eef9f3;
  border-color:#b8dfca;
}
.review-q.result-incorrect{
  background:#fff0f0;
  border-color:#efb8b8;
  box-shadow:inset 4px 0 0 #c93b3b;
}
.review-q.result-unanswered{
  background:#fffaf0;
  border-color:#ecd9a7;
}
.review-q-label{min-width:0}
.review-q-badges{display:flex;align-items:center;justify-content:flex-end;gap:5px;flex-wrap:wrap}
.result-badge{display:inline-flex;align-items:center;justify-content:center;padding:4px 7px;border-radius:999px;font-size:11px;font-weight:800;white-space:nowrap}
.result-badge.result-correct{background:#dff3e8;color:#12623e}
.result-badge.result-incorrect{background:#ffdede;color:#a91f1f}
.result-badge.result-unanswered{background:#fff0c7;color:#8b6100}
.result-badge[hidden]{display:none!important}
.review-q.result-incorrect .review-answer-select{border-color:#df8d8d;background:#fffafa}
.review-q.result-correct .review-answer-select{border-color:#91c9ab;background:#fbfffd}
@media(max-width:640px){
  .review-q{grid-template-columns:minmax(0,1fr) 76px}
  .review-q-badges{grid-column:1/-1;justify-content:flex-start}
}

.sort-head{appearance:none;border:0;background:transparent;padding:0;margin:0;font:inherit;font-weight:700;color:inherit;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.sort-head:hover{color:#2563eb}
.sort-head.active{color:#2563eb}
.sort-indicator{font-size:.95em;min-width:1em;text-align:center}

/* v4 serverless: 다중 관리자 로그인 / 총관리자 작업 로그 */
.topbar nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.super-nav{display:contents}
.admin-session{display:inline-flex;align-items:center;gap:8px;margin-left:8px;padding-left:10px;border-left:1px solid rgba(255,255,255,.18)}
.admin-who{display:flex;flex-direction:column;line-height:1.12;text-align:right}
.admin-who b{font-size:12px;color:#fff}
.admin-who small{font-size:10px;color:rgba(255,255,255,.68);margin-top:3px}
.auth-wrap{min-height:calc(100vh - 150px);display:grid;place-items:center;padding:34px 0}
.auth-card{width:min(440px,100%);padding:28px;display:flex;flex-direction:column;gap:16px}
.auth-card label{display:flex;flex-direction:column;gap:6px}
.auth-card label>span{font-size:12px;font-weight:750;color:var(--muted)}
.auth-title{display:flex;align-items:center;gap:14px;margin-bottom:4px}
.auth-title h1{font-size:23px;margin:0 0 5px}.auth-title p{margin:0;color:var(--muted);font-size:13px;line-height:1.55}
.auth-mark{width:54px;height:54px;border-radius:15px;display:grid;place-items:center;background:#183b5b;color:#fff;font-size:13px;font-weight:900;letter-spacing:.5px;flex:0 0 auto}
.auth-submit{height:44px;margin-top:2px}.auth-error{padding:10px 12px;border-radius:9px;background:#fff0f0;color:#a91f1f;font-size:12px;font-weight:700}
.admin-layout{grid-template-columns:330px 1fr;align-items:start}.admin-table td{vertical-align:middle}.admin-table select{min-width:120px}.subline{display:block;font-size:10px;color:var(--muted);margin-top:3px}.toggle-line{display:flex;align-items:center;gap:6px;white-space:nowrap;font-size:12px;font-weight:700}.toggle-line input{width:auto}.audit-filter{margin-bottom:16px}.audit-filter-grid{display:grid;grid-template-columns:repeat(4,minmax(130px,1fr));gap:10px;align-items:end}.audit-filter-grid label{display:flex;flex-direction:column;gap:5px}.audit-filter-grid label>span{font-size:12px;font-weight:700;color:var(--muted)}.audit-search{grid-column:span 2}.audit-table td{vertical-align:top}.audit-table details{min-width:170px}.audit-table summary{cursor:pointer;color:var(--primary);font-weight:700;font-size:12px}.audit-table pre{max-width:420px;white-space:pre-wrap;word-break:break-word;font-size:10px;line-height:1.45;background:#f7f8fa;border:1px solid var(--line);padding:8px;border-radius:8px;margin:6px 0 0}
@media(max-width:980px){.admin-layout{grid-template-columns:1fr}.audit-filter-grid{grid-template-columns:repeat(2,minmax(140px,1fr))}.audit-search{grid-column:span 2}.admin-session{margin-left:0;padding-left:0;border-left:0}}
@media(max-width:640px){.audit-filter-grid{grid-template-columns:1fr}.audit-search{grid-column:span 1}.admin-who{display:none}.auth-card{padding:22px}.topbar nav{gap:2px}.admin-session{width:100%;justify-content:flex-end;margin-top:4px}}
.auth-locked #main-nav>a,.auth-locked #super-nav,.auth-locked #admin-session{display:none!important}