*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#f5f7fa;--color-white:#fff;--color-primary:#3b82f6;--color-primary-hover:#2563eb;--color-text:#1e293b;--color-text-muted:#64748b;--color-border:#e2e8f0;--color-danger:#ef4444;--color-success:#22c55e;--color-warning:#f59e0b;--radius:8px;--shadow:0 1px 3px #00000014}body{background:var(--color-bg);color:var(--color-text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6}button{cursor:pointer;font:inherit}input,select{font:inherit}.conv-sidebar{flex-direction:column;flex:1;padding:0 10px;display:flex;overflow:hidden}.conv-new-btn{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);color:var(--color-text);text-align:left;flex-shrink:0;margin-bottom:8px;padding:10px 14px;font-size:14px;transition:background .15s}.conv-new-btn:hover{background:var(--color-bg)}.conv-list{flex-direction:column;flex:1;gap:2px;display:flex;overflow-y:auto}.conv-item{border-radius:var(--radius);cursor:pointer;align-items:center;padding:10px 14px;transition:background .15s;display:flex;position:relative}.conv-item:hover{background:var(--color-bg)}.conv-item.active{color:var(--color-primary);background:#eff6ff}.conv-item-title{text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:14px;overflow:hidden}.conv-item-rename{color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;flex-shrink:0;padding:2px 6px;font-size:14px;display:none}.conv-item:hover .conv-item-rename{display:block}.conv-item-rename:hover{color:var(--color-primary);background:#eff6ff}.conv-item-delete{color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;flex-shrink:0;padding:2px 6px;font-size:16px;display:none}.conv-item:hover 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var(--color-border);flex-direction:column;flex-shrink:0;gap:4px;padding:8px 10px;display:flex}.sidebar-nav-btn{border-radius:var(--radius);color:var(--color-text);text-align:left;background:0 0;border:none;align-items:center;gap:12px;width:100%;padding:12px 16px;font-size:15px;transition:background .15s,color .15s;display:flex}.sidebar-nav-btn:hover{background:var(--color-bg)}.sidebar-nav-btn.active{color:var(--color-primary);background:#eff6ff;font-weight:500}.sidebar-nav-btn .nav-icon{text-align:center;flex-shrink:0;width:24px;font-size:18px}.sidebar-footer{border-top:1px solid var(--color-border);padding:16px 10px}.sidebar-logout{border-radius:var(--radius);color:var(--color-text-muted);text-align:left;background:0 0;border:none;align-items:center;gap:12px;width:100%;padding:12px 16px;font-size:15px;transition:background .15s,color 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var(--color-border);resize:none;background:var(--color-bg);border-radius:12px;outline:none;flex:1;max-height:120px;padding:12px 16px;font-family:inherit;font-size:15px;line-height:1.6;transition:border-color .2s,box-shadow .2s}.chat-input-area textarea:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea26}.send-btn{color:#fff;cursor:pointer;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;transition:opacity .2s,transform .15s;display:flex}.send-btn:hover:not(:disabled){opacity:.9;transform:scale(1.03)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.attach-btn{width:44px;height:44px;color:var(--color-text-muted);border:1px solid var(--color-border);cursor:pointer;background:0 0;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;transition:border-color .2s,color .2s,background .2s;display:flex}.attach-btn:hover:not(:disabled){color:#667eea;background:#f8f7ff;border-color:#667eea}.attach-btn:disabled{opacity:.4;cursor:not-allowed}.chat-file-chips{background:#fff;flex-wrap:wrap;gap:8px;padding:10px 24px 0;display:flex}.chat-file-chip{color:#3b82f6;background:#eff6ff;border:1px solid #bfdbfe;border-radius:14px;align-items:center;gap:4px;padding:4px 14px;font-size:13px;display:inline-flex}.chat-file-chip .chip-remove{color:#3b82f6;opacity:.6;cursor:pointer;background:0 0;border:none;padding:0 2px;font-size:17px;line-height:1}.chat-file-chip .chip-remove:hover{opacity:1}@media (width<=860px){.analysis-panel{width:260px}.chat-msg{padding:0 16px}}@media (width<=680px){.chat-body{flex-direction:column}.analysis-panel{border-right:none;border-bottom:1px solid var(--color-border);width:100%;max-height:40%}.chat-msg{gap:10px;padding:0 12px}}.usage-page{flex-direction:column;align-items:center;height:100%;display:flex;overflow-y:auto}.usage-header{text-align:center;width:100%;max-width:800px;padding:40px 0 24px}.usage-header h2{font-size:24px;font-weight:700}.usage-loading,.usage-error{text-align:center;color:var(--color-text-muted);margin-top:100px;font-size:16px}.usage-error{color:var(--color-danger)}.usage-retry-btn{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);color:var(--color-primary);margin:16px auto;padding:10px 28px;font-size:15px;display:block}.usage-retry-btn:hover{background:#eff6ff}.usage-content{flex-direction:column;gap:24px;width:100%;max-width:800px;margin:0 auto;padding:0 28px 40px;display:flex}.usage-card{background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius);padding:24px}.plan-card{align-items:center;gap:24px;padding:28px 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li:before{content:"✓ ";color:var(--color-success);font-weight:600}.plan-option-btn{border:2px solid var(--color-primary);width:100%;color:var(--color-primary);cursor:pointer;background:0 0;border-radius:10px;padding:10px;font-size:15px;font-weight:600;transition:background .2s,color .2s}.plan-option-btn:hover:not(:disabled){background:var(--color-primary);color:#fff}.plan-option-btn:disabled{cursor:default}.plan-btn-current{background:var(--color-primary);color:#fff;opacity:.7}.modal-dialog{background:#fff;border-radius:14px;width:90%;max-width:400px;padding:28px 24px;box-shadow:0 20px 60px #00000026}.modal-dialog h3{margin:0 0 12px;font-size:18px;font-weight:600}.modal-dialog p{color:var(--color-text-muted);margin:0 0 8px;font-size:14px;line-height:1.6}.modal-hint{color:var(--color-text-muted);margin:0 0 20px;font-size:13px}.modal-actions{justify-content:flex-end;gap:10px;display:flex}.modal-btn-cancel{border:1px solid var(--color-border);color:var(--color-text-muted);cursor:pointer;background:#fff;border-radius:8px;padding:8px 20px;font-size:14px}.modal-btn-cancel:hover:not(:disabled){background:#f8f9fc}.modal-btn-confirm{color:#fff;cursor:pointer;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:8px;padding:8px 20px;font-size:14px;font-weight:500}.modal-btn-confirm:hover:not(:disabled){opacity:.9}.admin-page{flex-direction:column;max-width:1400px;height:100%;margin:0 auto;display:flex;overflow-y:auto}.admin-header{background:var(--color-white);border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:14px 20px;display:flex}.admin-header h2{font-size:17px;font-weight:600}.admin-header nav{gap:8px;display:flex}.nav-btn{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);color:var(--color-text);padding:6px 14px;font-size:13px;transition:background .2s}.nav-btn:hover{background:var(--color-bg)}.nav-btn.logout{color:var(--color-danger);border-color:var(--color-danger)}.nav-btn.logout:hover{background:#fef2f2}.admin-body{flex:1;padding:24px 20px}.admin-loading{height:100vh;color:var(--color-text-muted);justify-content:center;align-items:center;display:flex}.stats-row{grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:28px;display:grid}.stat-card{background:var(--color-white);border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);padding:20px}.stat-value{color:var(--color-primary);font-size:28px;font-weight:700}.stat-card.warn .stat-value{color:var(--color-warning)}.stat-label{color:var(--color-text-muted);margin-top:4px;font-size:13px}.admin-toolbar{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.admin-toolbar h3{font-size:16px}.btn-primary{background:var(--color-primary);color:#fff;border-radius:var(--radius);border:none;padding:8px 20px;font-size:14px;font-weight:500}.btn-primary:hover{background:var(--color-primary-hover)}.table-wrap{background:var(--color-white);border-radius:var(--radius);box-shadow:var(--shadow);overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;border-bottom:1px solid var(--color-border);padding:12px 16px}th{color:var(--color-text-muted);background:#f8fafc;font-size:13px;font-weight:600}.status-tag{border-radius:12px;padding:2px 10px;font-size:12px;font-weight:500;display:inline-block}.status-tag.active{color:#16a34a;background:#dcfce7}.status-tag.inactive{color:#dc2626;background:#fee2e2}.action-cell{gap:6px;display:flex}.btn-sm{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);color:var(--color-text);padding:4px 12px;font-size:12px}.btn-sm:hover{background:var(--color-bg)}.btn-danger{color:var(--color-danger);border-color:var(--color-danger)}.btn-danger:hover{background:#fef2f2}.btn-success{color:var(--color-success);border-color:var(--color-success)}.btn-success:hover{background:#f0fdf4}.empty-cell{text-align:center;color:var(--color-text-muted);padding:40px}.expire-warn{border-radius:var(--radius);background:#fffbeb;border:1px solid #fde68a;margin-top:24px;padding:16px 20px}.expire-warn h4{color:#92400e;margin-bottom:8px;font-size:14px}.expire-warn ul{color:#a16207;font-size:13px;list-style:none}.expire-warn li{padding:3px 0}.modal-overlay{z-index:100;background:#0006;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--color-white);border-radius:var(--radius);width:420px;max-width:90vw;padding:28px;box-shadow:0 4px 20px #00000026}.modal h3{margin-bottom:20px;font-size:17px}.modal label{margin-bottom:14px;font-size:13px;font-weight:500;display:block}.modal input,.modal select{border:1px solid var(--color-border);border-radius:var(--radius);outline:none;width:100%;margin-top:4px;padding:8px 10px;font-size:14px;display:block}.modal input:focus,.modal select:focus{border-color:var(--color-primary)}.modal-actions{justify-content:flex-end;gap:10px;margin-top:20px;display:flex}.btn-cancel{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);padding:8px 18px;font-size:14px}.btn-cancel:hover{background:var(--color-bg)}.tab-bar{border-bottom:2px solid var(--color-border);background:var(--color-white);gap:0;padding:0 20px;display:flex}.tab-btn{color:var(--color-text-muted);background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-2px;padding:12px 24px;font-size:14px;font-weight:500;transition:color .2s,border-color .2s}.tab-btn:hover{color:var(--color-text)}.tab-btn.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.kb-section{margin-bottom:32px}.kb-section h3{margin-bottom:14px;font-size:16px}.upload-controls{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.file-input{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);color:var(--color-text);padding:8px 10px;font-size:14px}.file-input::file-selector-button{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-bg);cursor:pointer;margin-right:8px;padding:4px 12px;font-size:13px}.upload-controls select{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);outline:none;padding:8px 10px;font-size:14px}.upload-controls select:focus{border-color:var(--color-primary)}.file-list-wrap{background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius);margin-top:14px;overflow:hidden}.file-list-toolbar{background:var(--color-bg);border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:10px 14px;font-size:13px;display:flex}.file-check-all{cursor:pointer;align-items:center;gap:6px;font-weight:500;display:flex}.file-check-all input[type=checkbox]{cursor:pointer;width:15px;height:15px;accent-color:var(--color-primary)}.file-list-count{color:var(--color-text-muted)}.file-list-table{border-collapse:collapse;width:100%;font-size:13px}.file-list-table td{border-bottom:1px solid var(--color-border);padding:8px 14px}.file-list-table tr:last-child td{border-bottom:none}.col-name{width:auto}.col-size{width:100px;color:var(--color-text-muted);white-space:nowrap}.col-remove{text-align:center;width:70px}.upload-results{background:var(--color-bg);border-radius:var(--radius);border:1px solid var(--color-border);margin-top:14px;padding:14px}.results-summary{margin-bottom:8px;font-size:14px;font-weight:600}.upload-results ul{font-size:13px;list-style:none}.upload-results li{padding:3px 0}.result-ok{color:var(--color-success)}.result-fail{color:var(--color-danger)}.toolbar-right{align-items:center;gap:8px;display:flex}.filter-select{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);outline:none;padding:6px 10px;font-size:13px}.btn-refresh{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);color:var(--color-text);padding:6px 14px;font-size:13px}.btn-refresh:hover{background:var(--color-bg)}.batch-bar{border-radius:var(--radius);color:var(--color-danger);background:#fef2f2;border:1px solid #fecaca;align-items:center;gap:12px;margin-bottom:8px;padding:8px 14px;font-size:13px;display:flex}.col-check{text-align:center;width:40px}.col-check input[type=checkbox]{cursor:pointer;width:15px;height:15px;accent-color:var(--color-primary)}.doc-id-cell{color:var(--color-text-muted);text-overflow:ellipsis;white-space:nowrap;max-width:200px;font-family:SF Mono,Fira Code,monospace;font-size:12px;overflow:hidden}@media (width<=768px){.stats-row{grid-template-columns:repeat(2,1fr)}.upload-controls{flex-direction:column;align-items:stretch}}.changepwd-page{justify-content:center;align-items:center;height:100%;padding:40px 20px;display:flex}.changepwd-form{border:1px solid var(--color-border);background:#fff;border-radius:16px;width:100%;max-width:400px;padding:36px 32px}.changepwd-form h2{color:var(--color-text);margin:0 0 6px;font-size:22px;font-weight:700}.changepwd-subtitle{color:var(--color-text-muted);margin:0 0 24px;font-size:13px}.changepwd-error{color:#dc2626;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;margin-bottom:16px;padding:10px 14px;font-size:13px}.changepwd-success{color:#16a34a;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;margin-bottom:16px;padding:10px 14px;font-size:13px}.changepwd-label{color:var(--color-text);margin-bottom:16px;font-size:13px;font-weight:600;display:block}.changepwd-label input{border:1px solid var(--color-border);box-sizing:border-box;border-radius:10px;outline:none;width:100%;margin-top:6px;padding:10px 14px;font-size:14px;transition:border-color .2s;display:block}.changepwd-label input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea1f}.changepwd-btn{color:#fff;cursor:pointer;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:10px;width:100%;margin-top:8px;padding:12px;font-size:15px;font-weight:600;transition:opacity .2s}.changepwd-btn:hover:not(:disabled){opacity:.9}.changepwd-btn:disabled{opacity:.5;cursor:not-allowed}.changepwd-cancel{width:100%;color:var(--color-text-muted);border:1px solid var(--color-border);cursor:pointer;background:0 0;border-radius:10px;margin-top:10px;padding:10px;font-size:14px;transition:background .2s}.changepwd-cancel:hover{background:#f8f9fc}