:root{--primary: #4f46e5;--primary-dark: #4338ca;--success: #22c55e;--warning: #f59e0b;--danger: #ef4444;--free-color: #bbf7d0;--free-color-2: #fef08a;--selected-color: #fed7aa;--bg-light: #f8fafc;--text-dark: #1e293b;--text-muted: #64748b;--border: #e2e8f0}body{background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh}.app-container{display:flex;flex-direction:column;min-height:100vh}.header{background:#fffffff2;padding:16px 24px;box-shadow:0 4px 6px -1px #0000001a;display:flex;align-items:center;justify-content:space-between}.header h1{color:var(--primary);font-size:24px;font-weight:600}.header-info{color:var(--text-muted);font-size:14px}.main-content{display:flex;flex:1;padding:20px;gap:20px}.left-panel{width:280px;display:flex;flex-direction:column;gap:16px}.teacher-list,.class-list{background:#fffffff2;border-radius:12px;padding:16px;box-shadow:0 4px 6px -1px #0000001a;max-height:calc(50vh - 100px);overflow-y:auto}.panel-title{font-size:16px;font-weight:600;color:var(--text-dark);margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--primary);display:flex;align-items:center;gap:8px}.search-box{display:flex;gap:8px;margin-bottom:12px}.search-box input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:6px;font-size:14px;outline:none;transition:border-color .2s}.search-box input:focus{border-color:var(--primary)}.search-box button{padding:8px 12px;background:var(--primary);color:#fff;border:none;border-radius:6px;cursor:pointer;transition:background .2s}.search-box button:hover{background:var(--primary-dark)}.teacher-item,.class-item{padding:10px 12px;margin-bottom:4px;border-radius:6px;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:8px}.teacher-item:hover,.class-item:hover{background:#f1f5f9}.teacher-item.selected{background:#fed7aa;font-weight:600}.teacher-item.free{background:var(--free-color)}.teacher-item.can-swap{background:var(--free-color-2)}.teacher-item.busy{background:#fecaca}.teacher-phone{font-size:12px;color:var(--text-muted);margin-left:auto}.schedule-panel{flex:1;background:#fffffff2;border-radius:12px;padding:20px;box-shadow:0 4px 6px -1px #0000001a;overflow:auto}.schedule-title{font-size:20px;font-weight:600;color:var(--text-dark);margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--primary);display:flex;align-items:center;justify-content:space-between}.class-info{font-size:14px;color:var(--text-muted);margin-bottom:4px}.schedule-table{width:100%;border-collapse:collapse;font-size:14px}.schedule-table th,.schedule-table td{border:1px solid var(--border);padding:12px 8px;text-align:center;min-width:100px}.schedule-table th{background:var(--primary);color:#fff;font-weight:600}.schedule-table th:first-child{background:var(--text-dark);width:60px}.schedule-table td{background:#fff;vertical-align:top;min-height:80px}.schedule-table td:first-child{background:#f1f5f9;font-weight:600;color:var(--text-dark)}.schedule-table td.highlight{background:var(--free-color)}.schedule-table td.special-row{background:#fef3c7}.schedule-table td.special-row:first-child{background:#f59e0b;color:#fff}.course-item.special-course{background:#fef3c7;border-left:3px solid #f59e0b}.course-item.special-course .course-name{color:#92400e}.course-item{padding:6px 4px;margin-bottom:4px;background:#f1f5f9;border-radius:4px;font-size:13px;cursor:pointer;transition:all .2s}.course-item:hover{background:#e2e8f0;transform:scale(1.02)}.course-item.selected{background:var(--selected-color);font-weight:600}.course-name{font-weight:600;color:#1e40af}.course-class{color:var(--text-muted);font-size:14px}.course-teacher{color:var(--success);font-size:12px}.swap-panel{background:#fffffff2;border-radius:12px;padding:16px;margin-top:16px;box-shadow:0 4px 6px -1px #0000001a}.swap-title{font-size:16px;font-weight:600;color:var(--text-dark);margin-bottom:12px;display:flex;align-items:center;gap:8px}.swap-content{background:#f8fafc;padding:12px;border-radius:8px;border:1px dashed var(--border)}.swap-content textarea{width:100%;min-height:100px;padding:12px;border:1px solid var(--border);border-radius:6px;font-size:14px;resize:vertical;outline:none;font-family:inherit}.swap-content textarea:focus{border-color:var(--primary)}.swap-actions{display:flex;gap:8px;margin-top:12px}.swap-actions button{padding:10px 20px;border:none;border-radius:6px;cursor:pointer;font-weight:600;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-success{background:var(--success);color:#fff}.btn-success:hover{background:#16a34a}.return-list{margin-top:12px}.return-item{display:inline-block;padding:6px 12px;margin:4px;background:var(--free-color);border-radius:4px;font-size:13px;cursor:pointer;transition:all .2s}.return-item:hover{background:#86efac;transform:scale(1.05)}.toolbar{display:flex;gap:12px;margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}.toolbar button{padding:10px 20px;background:var(--bg-light);border:1px solid var(--border);border-radius:6px;cursor:pointer;font-weight:500;transition:all .2s;display:flex;align-items:center;gap:6px}.toolbar button:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.icon{width:16px;height:16px;display:inline-block}.toast{position:fixed;top:20px;right:20px;padding:12px 24px;background:var(--success);color:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000001a;animation:slideIn .3s ease;z-index:1000}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--text-muted)}.spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 1024px){.main-content{flex-direction:column;padding:10px;gap:10px}.left-panel{width:100%;flex-direction:row;gap:10px}.teacher-list,.class-list{flex:1;max-height:280px;padding:12px}.app-container{font-size:16px}.header{padding:12px 16px}.header h1{font-size:18px}.panel-title{font-size:14px;margin-bottom:4px;padding-bottom:6px}.schedule-panel{padding:12px}.schedule-title{font-size:16px;margin-bottom:12px;padding-bottom:8px;display:flex;flex-wrap:wrap;align-items:center;gap:8px}.schedule-title>span{display:flex;flex-wrap:nowrap;align-items:center;gap:8px}.schedule-table{font-size:15px}.schedule-table th,.schedule-table td{padding:2px;min-width:60px}.course-item{padding:2px;font-size:15px;margin-bottom:0}.course-name{font-size:24px;font-weight:700}.course-class,.course-teacher{font-size:18px}.teacher-item-grid{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:15px;padding:10px 6px;min-height:40px}.teacher-row{grid-template-columns:repeat(6,1fr)!important}.class-item-grid{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:15px;padding:10px 6px;min-height:42px}.swap-panel{padding:12px;margin-top:12px}.swap-title{font-size:15px;margin-bottom:10px}.swap-content textarea{font-size:15px;padding:10px}.teacher-tag,.course-tag{font-size:18px!important;padding:3px!important}.search-box input{font-size:15px;padding:10px 12px}.teacher-categories,.return-courses{padding:10px}.swap-actions{flex-wrap:wrap}.swap-actions button{flex:1;min-width:100px;padding:12px 16px;font-size:15px}}.teacher-tag{display:inline-block;padding:3px 8px;border:1px solid;border-radius:4px;font-size:14px;cursor:pointer;transition:all .2s}.teacher-tag:hover{transform:scale(1.05);box-shadow:0 2px 4px #0000001a}.teacher-tag.selected{box-shadow:0 0 0 2px #4f46e5}.course-tag{display:inline-block;padding:4px 10px;border:1px solid;border-radius:4px;font-size:12px;cursor:pointer;transition:all .2s}.course-tag:hover{transform:scale(1.05);box-shadow:0 2px 4px #0000001a}.teacher-categories{background:#f8fafc;padding:12px;border-radius:8px;border:1px solid var(--border)}.return-courses{background:#f0fdf4;padding:12px;border-radius:8px;border:1px solid #bbf7d0}.teacher-list::-webkit-scrollbar,.class-list::-webkit-scrollbar{width:6px}.teacher-list::-webkit-scrollbar-thumb,.class-list::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}.teacher-list::-webkit-scrollbar-thumb:hover,.class-list::-webkit-scrollbar-thumb:hover{background:#94a3b8}.teacher-item.highlight-green{background:#dcfce7!important;border-left:3px solid #22c55e!important}.teacher-item.highlight-yellow{background:#fef9c3!important;border-left:3px solid #eab308!important}.teacher-item.highlight-pink{background:#fce7f3!important;border-left:3px solid #ec4899!important}.teacher-grid{display:flex;flex-direction:column;gap:4px}.teacher-row{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}.teacher-item-grid{padding:2px;border-radius:4px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:4px;font-size:18px;min-height:36px;background:#f8fafc;border:1px solid #e2e8f0}.teacher-item-grid span{white-space:nowrap;font-size:18px}.teacher-item-grid:has(span[data-name-length="4"]) span{font-size:15px}.teacher-item-grid:has(span[data-name-length="5"]) span,.teacher-item-grid:has(span[data-name-length="6"]) span{font-size:13px}.teacher-item-grid:hover{background:#e2e8f0}.teacher-item-grid.selected{background:#fed7aa;font-weight:600;border-color:#f59e0b}.teacher-item-grid.empty{background:transparent;border:1px dashed transparent;cursor:default}.teacher-item-grid .teacher-phone{margin-left:2px}.class-grid{display:flex;flex-direction:column;gap:4px}.class-row{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}.class-item-grid{padding:8px 6px;border-radius:6px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:500;min-height:40px;background:#f8fafc;border:1px solid #e2e8f0}.class-item-grid:hover{background:#e2e8f0}.class-item-grid.selected{background:#fed7aa;font-weight:600;border-color:#f59e0b}.class-item-grid.empty{background:transparent;border:1px dashed transparent;cursor:default}.mobile-hidden{display:block}@media (max-width: 1024px){.mobile-hidden{display:none!important}}