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.view-container{flex:1;overflow-y:auto;padding:24px}.menu-toggle{display:none;background:none;border:none;font-size:24px;color:var(--text);padding:8px;cursor:pointer;border-radius:6px;transition:background var(--transition)}.menu-toggle:hover{background:var(--bg)}.header-left{display:flex;align-items:center;gap:12px}.sidebar-overlay{display:none;position:fixed;inset:0;background:#0006;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:998;opacity:0;pointer-events:none;transition:opacity var(--transition)}.sidebar-overlay.visible{opacity:1;pointer-events:auto}@media(max-width:1024px){.menu-toggle{display:block}.sidebar{position:fixed;left:calc(-1 * var(--sidebar-w));top:0;bottom:0;z-index:1001;transition:transform .3s cubic-bezier(.4,0,.2,1);box-shadow:10px 0 30px #0000001a}.sidebar.visible{transform:translate(var(--sidebar-w))}.sidebar-overlay{display:block}.content header{padding:0 16px}.view-container{padding:16px 12px}.breadcrumb{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}}@media(max-width:768px){.form-row{grid-template-columns:1fr;gap:0}.modal-card{max-width:95vw;max-height:90vh}.modal-card .modal-body{padding:16px}.page-header{flex-direction:column;align-items:flex-start;gap:12px}.page-header .btn{width:100%;justify-content:center}.table th:nth-child(1),.table td:nth-child(1),.table th:nth-child(4),.table td:nth-child(4),.table th:nth-child(5),.table td:nth-child(5),.table th:nth-child(6),.table td:nth-child(6),.table th:nth-child(7),.table td:nth-child(7){display:none!important}.card{overflow-x:auto;-webkit-overflow-scrolling:touch}.table{min-width:100%!important}.table td{padding:12px 8px}}@media(max-width:480px){.breadcrumb{display:none}.page-title h2{font-size:18px!important}}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.page-header .page-title{display:flex;align-items:baseline;gap:12px}.page-header .page-title h2{margin:0;font-size:22px;font-weight:700;color:var(--text)}.page-header .page-title .subtitle{font-size:13px;color:var(--text-muted);background:var(--border);padding:2px 10px;border-radius:20px}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);overflow:hidden}.table{width:100%;border-collapse:collapse}.table th{text-align:left;padding:14px 16px;color:var(--text-muted);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.8px;background:#f8f9fc;border-bottom:1px solid var(--border)}.table td{padding:15px 16px;border-bottom:1px solid var(--border);vertical-align:middle}.table tbody tr{transition:background var(--transition)}.table tbody tr:last-child td{border-bottom:none}.table tbody tr:hover{background:#fafbff}.table .row-num{color:var(--text-muted);font-size:13px;width:40px}.table .actions{text-align:right;white-space:nowrap}.badge{background:var(--primary-light);color:var(--primary);padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600}.btn{padding:9px 18px;border-radius:8px;border:none;font-weight:600;font-size:14px;cursor:pointer;transition:all var(--transition);font-family:inherit;display:inline-flex;align-items:center;gap:6px}.btn.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px #5b6ef54d}.btn.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px #5b6ef566}.btn.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn.btn-ghost:hover{background:var(--bg);color:var(--text)}.btn-icon{background:transparent;border:none;font-size:16px;cursor:pointer;padding:6px 8px;border-radius:6px;transition:all var(--transition);line-height:1}.btn-icon.edit:hover{background:var(--primary-light)}.btn-icon.danger:hover{background:var(--danger-light)}.error-banner{background:var(--danger-light);color:var(--danger);border:1px solid #fca5a5;border-radius:var(--radius);padding:14px 18px;margin-bottom:20px;font-size:14px;font-weight:500;display:flex;align-items:center;gap:8px}.loading-state{text-align:center;padding:60px 40px;color:var(--text-muted)}.loading-state .spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 16px}.loading-state p{font-size:14px;margin:0}.empty-state{text-align:center;padding:60px 40px;color:var(--text-muted)}.empty-state .empty-icon{font-size:56px;margin-bottom:12px}.empty-state p{font-size:14px;margin:0}@keyframes spin{to{transform:rotate(360deg)}}.modal-overlay{position:fixed;inset:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .15s ease}.modal-card{background:var(--surface);border-radius:14px;width:100%;max-width:520px;box-shadow:var(--shadow-lg);animation:slideUp .2s ease;overflow:hidden}.modal-card .modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--border)}.modal-card .modal-header h3{margin:0;font-size:17px;font-weight:700}.modal-card .modal-header .modal-close{background:none;border:none;font-size:18px;cursor:pointer;color:var(--text-muted);padding:4px 8px;border-radius:6px;transition:all var(--transition)}.modal-card .modal-header .modal-close:hover{background:var(--bg);color:var(--text)}.modal-card .modal-body{padding:24px;max-height:70vh;overflow-y:auto}.modal-card .modal-footer{padding:16px 24px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:10px;background:#fafbfc}.form-group{margin-bottom:18px}.form-group label{display:block;margin-bottom:6px;font-weight:600;font-size:13px;color:var(--text)}.form-group label .required{color:var(--danger)}.form-group input,.form-group select{width:100%;padding:10px 12px;border-radius:8px;border:1px solid var(--border);font-family:inherit;font-size:14px;background:var(--surface);color:var(--text);transition:border-color var(--transition),box-shadow var(--transition)}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #5b6ef51a}.form-group input::placeholder,.form-group select::placeholder{color:var(--text-muted)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f0f23,#13132b,#1e1e3f);position:relative;overflow:hidden}.login-container:before{content:"";position:absolute;width:600px;height:600px;background:radial-gradient(circle,rgba(91,110,245,.15) 0%,transparent 70%);top:-200px;right:-200px}.login-container:after{content:"";position:absolute;width:400px;height:400px;background:radial-gradient(circle,rgba(91,110,245,.1) 0%,transparent 70%);bottom:-150px;left:-100px}.login-card{position:relative;z-index:1;width:100%;max-width:420px;background:#fffffff7;border-radius:16px;padding:44px 40px;box-shadow:0 20px 60px #0000004d}.login-card .login-header{text-align:center;margin-bottom:36px}.login-card .login-header .logo-large{font-size:52px;margin-bottom:12px}.login-card .login-header h1{font-size:24px;font-weight:700;margin:0 0 6px;color:var(--text)}.login-card .login-header p{color:var(--text-muted);margin:0;font-size:14px}.login-card .hint-box{background:var(--primary-light);border:1px solid rgba(91,110,245,.2);border-radius:8px;padding:10px 14px;font-size:13px;color:var(--primary);margin-bottom:20px;text-align:center}.btn-login{width:100%;padding:13px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-weight:700;font-size:16px;cursor:pointer;margin-top:6px;font-family:inherit;transition:all var(--transition);box-shadow:0 4px 14px #5b6ef566}.btn-login:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px #5b6ef580}.error{color:var(--danger);font-size:13px;text-align:center;margin:10px 0 0;padding:10px;background:var(--danger-light);border-radius:6px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.cover-thumb{width:40px;height:50px;border-radius:4px;overflow:hidden;background:var(--primary-light);display:flex;align-items:center;justify-content:center;flex-shrink:0}.cover-thumb img{width:100%;height:100%;object-fit:cover}.cover-thumb .cover-placeholder{font-size:20px}.file-link{display:block;font-size:11px;color:var(--primary);text-decoration:none;margin-top:3px}.file-link:hover{text-decoration:underline}.badge-audio{background:#fef3c7;color:#d97706}.badge-ebook{background:var(--primary-light);color:var(--primary)}.upload-box{border:2px dashed var(--border);border-radius:8px;padding:14px 18px;display:flex;align-items:center;gap:10px;cursor:pointer;font-size:14px;color:var(--text-muted);transition:all var(--transition)}.upload-box:hover{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}.upload-box .upload-icon{font-size:20px}.file-chip{font-size:12px;color:var(--primary);margin:6px 0 0;background:var(--primary-light);padding:4px 10px;border-radius:20px;display:inline-block}.cover-upload-area{margin-bottom:20px;display:flex;flex-direction:column;align-items:center;gap:8px}.cover-preview-box{width:140px;height:180px;border-radius:10px;border:2px dashed var(--border);overflow:hidden;cursor:pointer;position:relative;display:flex;align-items:center;justify-content:center;background:var(--bg);transition:border-color var(--transition)}.cover-preview-box:hover{border-color:var(--primary)}.cover-preview-box:hover .cover-overlay{opacity:1}.cover-preview-box .cover-preview-img{width:100%;height:100%;object-fit:cover}.cover-preview-box .cover-overlay{position:absolute;inset:0;background:#00000080;color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;opacity:0;transition:opacity var(--transition)}.cover-preview-box .cover-placeholder-large{text-align:center;color:var(--text-muted)}.cover-preview-box .cover-placeholder-large span{font-size:36px;display:block;margin-bottom:8px}.cover-preview-box .cover-placeholder-large p{font-size:12px;margin:0}.toggle-group{margin-bottom:18px}.toggle-label{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:14px;font-weight:500;-webkit-user-select:none;user-select:none}.toggle-switch{width:42px;height:24px;border-radius:12px;background:var(--border);position:relative;flex-shrink:0;transition:background var(--transition)}.toggle-switch.on{background:var(--primary)}.toggle-switch.on .toggle-thumb{transform:translate(18px)}.toggle-switch .toggle-thumb{position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform var(--transition);box-shadow:0 1px 4px #0003}