:root{--primary: #0d9488;--primary-light: #f0fdfa;--bg: #fbfbf9;--card-bg: #ffffff;--border: #e5e7eb;--border-settings: #e2e8f0;--table-row-border: #f1f5f9;--table-header-bg: #faf9f6;--text-primary: #1e293b;--text-secondary: #4b5563;--text-settings-secondary: #64748b;--text-muted: #9ca3af;--text-placeholder: #94a3b8;--success-bg: #ecfdf5;--success-text: #047857;--success-bg-settings: #dcfce7;--success-text-settings: #15803d;--warning-bg: #fffbeb;--warning-text: #b45309;--danger-bg: #fef2f2;--danger-text: #b91c1c;--tag-bg: #f3f4f6;--tag-text: #4b5563;--sidebar-w: 240px;--topbar-h: 72px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text-primary);font-size:14px}a{text-decoration:none;color:var(--primary)}.layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);background:#fff;border-right:1px solid var(--border);display:flex;flex-direction:column;padding:24px 16px;gap:32px;position:fixed;top:0;bottom:0;left:0;z-index:10}.main{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column}.topbar{height:var(--topbar-h);background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 32px;position:sticky;top:0;z-index:9}.topbar h1{font-size:20px;font-weight:700;color:var(--text-primary)}.topbar-right{display:flex;align-items:center;gap:20px}.topbar-search{background:var(--bg);border:none;border-radius:8px;padding:8px 12px;width:220px;font-size:13px;display:flex;align-items:center;gap:8px}.topbar-search input{border:none;background:none;outline:none;width:100%;font-size:13px;color:var(--text-secondary)}.topbar-icon{width:20px;height:20px;color:var(--text-muted);cursor:pointer}.topbar-divider{width:1px;height:16px;background:var(--border)}.topbar-campus{display:flex;align-items:center;gap:6px;font-size:14px;color:var(--text-secondary);font-weight:500;cursor:pointer}.content{padding:32px;flex:1}.brand{display:flex;align-items:center;gap:8px;padding-left:8px}.brand-mark{width:38px;height:38px;border-radius:8px;object-fit:contain;flex-shrink:0}.brand-text{display:flex;flex-direction:column;gap:2px}.brand-title{font-size:16px;font-weight:700;color:var(--text-primary)}.brand-subtitle{font-size:10px;font-weight:500;color:var(--text-muted)}.nav{display:flex;flex-direction:column;gap:6px}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:8px;cursor:pointer;font-size:14px;font-weight:500;color:var(--text-secondary);transition:all .15s}.nav-item:hover{background:var(--primary-light)}.nav-item.active{background:var(--primary-light);color:var(--primary);font-weight:600}.nav-item svg{width:18px;height:18px;flex-shrink:0}.nav-footer{margin-top:auto;display:flex;flex-direction:column;gap:16px}.nav-footer hr{border:none;border-top:1px solid var(--border);margin:0}.user-card{display:flex;align-items:center;gap:12px}.user-avatar{width:38px;height:38px;border-radius:50%;background:var(--primary-light);display:flex;align-items:center;justify-content:center;color:var(--primary);font-weight:600;font-size:14px}.user-info{display:flex;flex-direction:column;gap:2px}.user-name{font-size:14px;font-weight:600;color:var(--text-primary)}.user-role{font-size:12px;color:var(--text-muted)}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:24px}.stat-card{background:#fff;border:1px solid var(--border);border-radius:12px;padding:24px;display:flex;flex-direction:column;gap:16px}.stat-header{display:flex;justify-content:space-between;align-items:center}.stat-label{font-size:14px;color:var(--text-secondary)}.stat-icon{width:36px;height:36px;background:var(--primary-light);border-radius:8px;display:flex;align-items:center;justify-content:center}.stat-icon svg{width:18px;height:18px;color:var(--primary)}.stat-value{font-size:28px;font-weight:700;color:var(--text-primary)}.stat-trend{font-size:12px;font-weight:600;margin-left:12px}.stat-trend.up{color:var(--success-text)}.stat-trend.down{color:var(--danger-text)}.badge{display:inline-flex;align-items:center;gap:4px;padding:2px 8px;border-radius:4px;font-size:12px;font-weight:600}.badge-dot{width:5px;height:5px;border-radius:50%}.badge-success{background:var(--success-bg);color:var(--success-text)}.badge-success .badge-dot{background:var(--success-text)}.badge-success-solid{background:#dcfce7;color:#15803d}.badge-warning{background:var(--warning-bg);color:var(--warning-text)}.badge-warning .badge-dot{background:var(--warning-text)}.badge-danger{background:var(--danger-bg);color:var(--danger-text)}.badge-danger .badge-dot{background:var(--danger-text)}.badge-tag{background:var(--tag-bg);color:var(--tag-text);padding:2px 6px;font-size:11px;border-radius:4px;font-weight:400}.table-card{background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}.table-header{display:flex;align-items:center;background:var(--table-header-bg);border-bottom:1px solid var(--border);padding:14px 24px;font-size:13px;font-weight:600;color:var(--text-secondary)}.table-header>span{flex-shrink:0}.table-row{display:flex;align-items:center;padding:14px 24px;border-bottom:1px solid var(--table-row-border);font-size:13px;color:var(--text-secondary);transition:background .1s}.table-row:last-child{border-bottom:none}.nickname-cell{cursor:pointer}.nickname-cell:hover{color:var(--primary);text-decoration:underline dotted}.nickname-input{width:96px;border:1px solid var(--primary);border-radius:6px;padding:4px 8px;font-size:13px;outline:none;font-family:inherit}.table-row:hover{background:#fafafa}.table-row .strong{color:var(--text-primary);font-weight:600}.table-row .link{color:var(--primary);font-weight:600;cursor:pointer;font-size:13px}.table-cell-ellipsis{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.settings-table{background:#fff;border:1px solid var(--border-settings);border-radius:12px;overflow:hidden}.settings-table .table-header{background:var(--table-header-bg);border-bottom:1px solid var(--border-settings);padding:16px;font-size:14px;color:var(--text-primary)}.settings-table .table-row{border-bottom:1px solid var(--table-row-border);padding:16px;font-size:14px;color:var(--text-primary)}.filter-bar{background:#fff;border:1px solid var(--border-settings);border-radius:12px;padding:16px;display:flex;gap:16px;align-items:center;margin-bottom:20px;flex-wrap:wrap}.filter-search{border:1px solid var(--border-settings);border-radius:6px;padding:8px 12px;width:260px;display:flex;align-items:center;gap:8px}.filter-search input{border:none;background:none;outline:none;width:100%;font-size:13px;color:var(--text-primary)}.filter-search input::placeholder{color:var(--text-placeholder)}.filter-dropdown{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-settings-secondary)}.filter-dropdown select{border:1px solid var(--border-settings);border-radius:6px;padding:8px 12px;font-size:13px;color:var(--text-primary);outline:none;background:#fff;cursor:pointer}.pagination{display:flex;justify-content:space-between;align-items:center;margin-top:20px}.pagination-info{font-size:13px;color:var(--text-muted)}.pagination-btns{display:flex;gap:8px}.page-btn{background:#fff;border:1px solid var(--border);border-radius:6px;padding:6px 12px;font-size:12px;color:var(--text-secondary);cursor:pointer}.page-btn.active{background:var(--primary);color:#fff;font-weight:600;border-color:var(--primary)}.page-btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;border:none;border-radius:8px;padding:10px 16px;font-size:14px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:6px}.btn-primary:hover{opacity:.9}.btn-outline{background:#fff;color:var(--text-primary);border:1px solid var(--border-settings);border-radius:8px;padding:10px 16px;font-size:14px;font-weight:500;cursor:pointer}.btn-danger{background:var(--danger-bg);color:var(--danger-text);border:none;border-radius:6px;padding:8px 16px;font-size:13px;font-weight:600;cursor:pointer}.subtabs{display:flex;gap:0;border-bottom:1px solid var(--border-settings);margin-bottom:20px}.subtab{padding:12px 24px;font-size:14px;font-weight:600;color:var(--text-settings-secondary);border-bottom:2px solid transparent;cursor:pointer;text-decoration:none}.subtab:hover{color:var(--text-primary)}.subtab.active{color:var(--primary);border-bottom-color:var(--primary)}.settings-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.settings-title{font-size:20px;font-weight:700;color:var(--text-primary)}.settings-desc{font-size:13px;color:var(--text-settings-secondary);margin-top:4px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000004d;display:flex;align-items:center;justify-content:center;z-index:100}.modal{background:#fff;border-radius:16px;box-shadow:0 10px 12px #0003;width:520px;max-width:96vw;max-height:88vh;overflow-y:auto;padding:24px}.modal-title{font-size:18px;font-weight:700;color:var(--text-primary);margin-bottom:20px}.dash-grid{display:flex;gap:24px;align-items:flex-start}.dash-left{flex:1;min-width:0;background:#fff;border:1px solid var(--border);border-radius:12px;padding:24px}.dash-right{width:420px;flex-shrink:0;background:#fff;border:1px solid var(--border);border-radius:12px;padding:24px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.section-title{font-size:16px;font-weight:700;color:var(--text-primary)}.section-link{font-size:13px;font-weight:600;color:var(--primary);cursor:pointer}.comm-card{background:var(--bg);border-radius:8px;padding:16px;display:flex;flex-direction:column;gap:12px;margin-bottom:12px}.comm-header{display:flex;justify-content:space-between;align-items:center}.comm-info{display:flex;gap:8px;align-items:center}.comm-teacher{font-size:14px;font-weight:600;color:var(--text-primary)}.comm-role-badge{background:var(--primary-light);color:var(--primary);padding:2px 6px;border-radius:4px;font-size:11px}.comm-student{font-size:14px;color:var(--text-secondary)}.comm-student b{color:var(--text-primary)}.comm-time{font-size:12px;color:var(--text-muted)}.comm-summary{font-size:13px;color:var(--text-secondary);line-height:1.5}.comm-footer{display:flex;justify-content:space-between;align-items:center}.comm-detail-link{font-size:13px;font-weight:600;color:var(--primary);cursor:pointer}.remind-card{background:#fff;border:1px solid var(--border);border-radius:8px;padding:16px;display:flex;flex-direction:column;gap:12px;margin-bottom:16px}.remind-header{display:flex;gap:8px;align-items:center}.remind-icon{width:24px;height:24px;background:var(--danger-bg);border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.remind-icon svg{width:12px;height:12px;color:var(--danger-text)}.remind-title{font-size:14px;font-weight:600;color:var(--text-primary);flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.remind-desc{font-size:13px;color:var(--text-secondary);line-height:1.4}.remind-footer{display:flex;justify-content:space-between;align-items:flex-end;padding-top:4px}.remind-meta{display:flex;flex-direction:column;gap:2px;font-size:12px}.remind-owner{color:var(--text-muted)}.remind-deadline{color:var(--danger-text);font-weight:500}.remind-btn{background:var(--primary);color:#fff;border:none;border-radius:6px;padding:6px 12px;font-size:12px;font-weight:600;cursor:pointer}.import-drop{background:var(--table-header-bg);border:1.5px dashed var(--primary);border-radius:8px;padding:32px 20px;text-align:center;cursor:pointer;display:flex;flex-direction:column;gap:12px;align-items:center}.import-drop-text{font-size:14px;font-weight:600;color:var(--primary)}.import-drop-sub{font-size:12px;color:var(--text-placeholder)}.import-drop-note{font-size:12px;color:var(--text-settings-secondary)}.import-template{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--primary);cursor:pointer;text-decoration:underline}.import-progress{width:100%}.import-progress-header{display:flex;justify-content:space-between;font-size:13px;margin-bottom:8px}.import-progress-label{color:var(--primary);font-weight:600}.import-progress-count{color:var(--text-settings-secondary)}.import-bar{height:6px;background:#f1f5f9;border-radius:3px;overflow:hidden}.import-bar-fill{height:100%;background:var(--primary);border-radius:3px;transition:width .3s}.form-label{font-size:13px;font-weight:500;color:var(--text-settings-secondary);margin-bottom:6px;display:block}.form-input{width:100%;border:1px solid var(--border-settings);border-radius:8px;padding:10px 12px;font-size:14px;color:var(--text-primary);outline:none}.form-input:focus{border-color:var(--primary)}@media (max-width:1200px){.dash-grid{flex-direction:column}.dash-right{width:100%}.stat-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:768px){.stat-grid{grid-template-columns:1fr}.filter-bar{flex-direction:column;align-items:stretch}}.empty-state{display:flex;flex-direction:column;align-items:center;gap:8px;padding:48px 0;color:var(--text-muted);font-size:14px}.empty-hint{font-size:12px;opacity:.7}