:root{color-scheme:light;--blue: #1264ad;--blue-dark: #0d579a;--blue-soft: #e9f3ff;--page: #f4f6fb;--panel: #ffffff;--line: #dfe6f0;--ink: #1c2b3a;--muted: #6e7f91;--green: #20a06b;--amber: #c8871c;--danger: #d64545}*{box-sizing:border-box}body{margin:0;min-width:1180px;background:var(--page);color:var(--ink);font-family:Microsoft YaHei,PingFang SC,Arial,sans-serif}button,input,select{font:inherit}button{cursor:pointer}.login-page{display:grid;grid-template-columns:1fr 420px;gap:48px;align-items:center;min-height:100vh;padding:64px 9vw;background:linear-gradient(120deg,#0d5faa,#1674c6 46%,#f5f7fb 46%)}.login-brand{color:#fff}.brand-chip{display:inline-flex;border:1px solid rgba(255,255,255,.34);border-radius:6px;padding:8px 12px;font-size:14px}.login-brand h1{margin:24px 0 12px;font-size:46px;letter-spacing:0}.login-brand p{margin:0;color:#ffffffd1;font-size:18px}.login-card{display:grid;gap:18px;padding:30px;border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 22px 60px #14355a24}.login-card h2{margin:0}label{display:grid;gap:8px;color:#344457;font-weight:700}input,select,textarea{height:38px;border:1px solid var(--line);border-radius:4px;background:#fff;color:var(--ink);outline:none;padding:0 12px}input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px #1264ad1f}textarea{min-height:70px;resize:vertical;padding:10px 12px}.admin-layout{display:grid;grid-template-columns:138px minmax(1040px,1fr);min-height:100vh}.sidebar{background:var(--blue);color:#fff}.sidebar-title{display:grid;gap:6px;padding:18px 8px 14px}.sidebar-title strong{font-size:13px}.sidebar-title span{color:#ffffffb8;font-size:12px}.nav-list{display:grid;gap:8px;padding:8px}.nav-group{display:grid;gap:4px}.nav-group-head{display:flex;align-items:center;justify-content:space-between;min-height:34px;width:100%;border:0;border-radius:4px;background:#ffffff14;color:#ffffffe6;padding:0 8px;text-align:left}.nav-group-head span{display:inline-flex;align-items:center;gap:8px;min-width:0;font-size:12px;font-weight:800}.nav-group-head:hover{background:#ffffff24}.nav-children{display:grid;gap:4px;padding-left:8px}.nav-item{display:flex;align-items:center;gap:8px;min-height:34px;width:100%;border:0;border-radius:4px;background:transparent;color:#fff;padding:0 8px 0 10px;text-align:left}.nav-item.active,.nav-item:hover{background:#ffffff2e}.workspace{min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;height:42px;border-bottom:1px solid var(--line);background:#fff;padding:0 18px}.topbar h1{margin:0;font-size:16px}.topbar span{color:var(--muted);font-size:12px}.top-actions{display:flex;align-items:center;gap:12px;color:#334155;font-size:12px}.boot-screen{display:grid;min-height:100vh;place-items:center;color:var(--muted)}.search-box,.filter-search{display:flex;align-items:center;gap:8px;width:260px;height:30px;border:1px solid var(--line);border-radius:4px;color:var(--muted);padding:0 10px}.search-box input,.filter-search input{width:100%;height:28px;border:0;box-shadow:none;padding:0}.notice-dot{display:grid;place-items:center;width:17px;height:17px;border-radius:50%;background:#e63636;color:#fff!important;font-size:11px!important}.avatar{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#dcecff;color:var(--blue);font-weight:800}.top-icon-btn{display:grid;width:30px;height:30px;place-items:center;border:1px solid var(--line);border-radius:4px;background:#fff;color:#4d6073}.course-page{min-height:calc(100vh - 42px);padding:18px 16px}.page-title{margin-bottom:12px}.page-title h2{margin:0 0 6px;font-size:18px}.page-title p{margin:0;color:var(--muted);font-size:12px}.course-list-panel{min-height:calc(100vh - 104px);border:1px solid var(--line);border-radius:6px;background:#fff}.category-page-body{display:grid;grid-template-columns:320px minmax(0,1fr);gap:16px;padding:14px}.category-edit-panel{display:grid;align-content:start;gap:14px;border:1px solid var(--line);border-radius:6px;background:#fbfcfe;padding:16px}.category-edit-panel h3{margin:0;font-size:15px}.form-actions{display:flex;justify-content:flex-end;gap:8px}.list-head{display:flex;align-items:center;justify-content:space-between;min-height:56px;border-bottom:1px solid var(--line);padding:10px 12px}.list-head h3{margin:0 0 4px;font-size:14px}.list-head span{color:var(--muted);font-size:12px}.list-actions{display:flex;align-items:center;gap:10px}.section-head{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:14px}.section-head h2,.summary-panel h2{margin:0 0 8px;font-size:18px}.section-head p{margin:0;color:var(--muted);font-size:13px}.primary-btn,.ghost-btn,.wide-btn,.icon-action,.close-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:32px;border:1px solid transparent;border-radius:4px;padding:0 12px}.primary-btn{background:var(--blue);color:#fff}.primary-btn:hover{background:var(--blue-dark)}.primary-btn:disabled{cursor:not-allowed;opacity:.65}.ghost-btn{background:#fff;border-color:var(--line);color:#344457}.ghost-btn:disabled{cursor:not-allowed;color:#9aa8b7;background:#f7f9fc;opacity:.72}.filters{display:flex;gap:10px;align-items:center;margin-bottom:10px}.filters select{width:104px}.filter-search{width:240px;height:38px;background:#fff}.course-table-wrap,.records-table-wrap{overflow:auto}.course-table,.records-table{width:100%;border-collapse:collapse}.course-table th,.course-table td,.records-table th,.records-table td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:middle}.course-table th,.records-table th{background:#f7f9fc;color:#536579;font-size:12px;font-weight:700}.course-table td{color:#394b5f;font-size:12px}.course-table td:first-child{border-left:3px solid transparent}.course-table tbody tr:hover{background:#f6fbff}.course-table tbody tr:hover td:first-child{border-left-color:var(--blue)}.course-table strong{display:block;color:#1f3348;font-size:13px}.course-table span{display:block;margin-top:4px;color:#8391a2;font-size:11px}.table-cover{width:62px;height:40px;border-radius:4px;object-fit:cover}.table-link{display:block;max-width:340px;overflow:hidden;color:var(--blue);text-decoration:none;text-overflow:ellipsis;white-space:nowrap}.user-cell{display:flex;align-items:center;gap:10px}.user-avatar{display:inline-grid!important;place-items:center;width:30px;height:30px;flex:none;margin:0!important;border-radius:50%;background:var(--blue-soft);color:var(--blue)!important}.record-btn{display:inline-flex;align-items:center;gap:6px;min-height:28px;border:1px solid #b8d7f4;border-radius:4px;background:#eef7ff;color:var(--blue);padding:0 9px}.record-actions{display:grid;gap:6px;min-width:116px}.completion-cell{display:flex;align-items:center;gap:10px;min-width:150px}.completion-bar{width:92px;height:6px;overflow:hidden;border-radius:999px;background:#edf1f6}.completion-bar span{display:block;height:100%;border-radius:inherit;background:#1674c6}.completion-cell strong{min-width:34px;color:#5d6d7e;font-size:12px}.table-actions{display:flex;gap:6px}.table-empty{height:92px;color:var(--muted)!important;text-align:center!important}.table-error{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px;border:1px solid #f3c9c9;border-radius:4px;background:#fff6f6;color:var(--danger);padding:10px 12px;font-size:12px}.table-pagination{display:flex;align-items:center;justify-content:space-between;min-height:54px;border-top:1px solid var(--line);color:var(--muted);padding:10px 12px;font-size:12px}.pagination-actions{display:flex;align-items:center;gap:8px}.pagination-actions select{width:96px;height:32px}.pagination-actions strong{min-width:58px;color:#344457;text-align:center}.records-modal{width:min(980px,calc(100vw - 48px))}.compact-records-modal{width:min(520px,calc(100vw - 48px))}.modal-head p{margin:6px 0 0;color:var(--muted);font-size:12px}.learned-tag{display:inline-flex;border:1px solid #bde7d2;border-radius:4px;background:#edf9f3;color:var(--green);padding:4px 8px}.not-started-tag{display:inline-flex;border:1px solid #d8e0ea;border-radius:4px;background:#f4f7fa;color:#6d7d8f;padding:4px 8px}.icon-action{width:28px;min-height:28px;border-color:var(--line);background:#fff;color:#4d6073;padding:0}.icon-action.danger{color:var(--danger)}.summary-panel{border-left:1px solid var(--line);background:#fff;padding:14px 8px}.metric{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:11px 0;color:var(--muted);font-size:12px}.metric strong{color:var(--blue);font-size:20px}.wide-btn{width:100%;margin-top:10px;background:var(--blue);color:#fff}.wide-btn.outline{border-color:var(--line);background:#fff;color:#344457}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#0f172a73;z-index:10}.modal{display:grid;gap:16px;width:520px;border-radius:8px;background:#fff;padding:22px;box-shadow:0 24px 80px #0f172a38}.modal-head,.modal-actions{display:flex;align-items:center;justify-content:space-between}.modal-head h2{margin:0;font-size:18px}.close-btn{width:32px;min-height:32px;background:#f1f5f9;color:#334155;padding:0}.upload-box{position:relative;display:flex;align-items:center;gap:8px;height:42px;border:1px dashed #9bb9d9;border-radius:4px;color:var(--blue);padding:0 12px}.upload-box input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.cover-preview{width:168px;height:96px;border:1px solid var(--line);border-radius:4px;object-fit:cover}.modal-actions{justify-content:flex-end;gap:10px}.error-text{min-height:18px;margin:0;color:var(--danger);font-size:13px}.drawer-mask{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;justify-content:flex-end;background:#0f172a57;z-index:12}.question-drawer{display:grid;grid-template-rows:auto auto minmax(0,1fr) auto;width:min(760px,calc(100vw - 160px));height:100vh;background:#fff;box-shadow:-20px 0 70px #0f172a33}.record-drawer{display:grid;grid-template-rows:auto minmax(0,1fr);width:min(620px,calc(100vw - 160px));height:100vh;background:#fff;box-shadow:-20px 0 70px #0f172a33}.drawer-head{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:18px 20px}.drawer-head h2{margin:0 0 6px;font-size:18px}.drawer-head p{margin:0;color:var(--muted);font-size:12px}.drawer-toolbar{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#fbfcfe;padding:12px 20px;color:var(--muted);font-size:12px}.question-list{display:grid;align-content:start;gap:14px;overflow:auto;padding:16px 20px}.question-editor{display:grid;gap:12px;border:1px solid var(--line);border-radius:6px;background:#fbfcfe;padding:14px}.question-editor-head{display:flex;align-items:center;justify-content:space-between}.question-editor-head strong{font-size:14px}.question-row,.option-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.drawer-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);background:#fff;padding:14px 20px}.drawer-footer>div{display:flex;align-items:center;gap:10px}.drawer-empty{display:grid;place-items:center;color:var(--muted)}.drawer-table-wrap{overflow:auto;padding:14px}