*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4f6ef7;--primary-hover: #3b5de7;--primary-light: #eef2ff;--primary-gradient: linear-gradient(135deg, #4f6ef7 0%, #7c5cfc 100%);--success: #10b981;--success-light: #ecfdf5;--warning: #f59e0b;--warning-light: #fffbeb;--danger: #ef4444;--danger-light: #fef2f2;--info: #06b6d4;--info-light: #ecfeff;--bg: #f5f7fb;--bg-elevated: #ffffff;--card: #ffffff;--border: #e5e9f2;--border-light: #f0f2f8;--text: #1a2138;--text-secondary: #5a6478;--text-light: #8b95a8;--text-muted: #b8c0d0;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .04);--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .07), 0 2px 4px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .08), 0 4px 8px rgba(0, 0, 0, .04);--shadow-xl: 0 20px 50px rgba(0, 0, 0, .12);--shadow-primary: 0 4px 14px rgba(79, 110, 247, .35);--radius-sm: 6px;--radius: 10px;--radius-lg: 14px;--radius-xl: 20px;--transition: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .35s cubic-bezier(.4, 0, .2, 1);--sidebar-width: 240px;--sidebar-collapsed: 68px}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-16px)}to{opacity:1;transform:translate(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(16px)}to{opacity:1;transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.animate-fade-in{animation:fadeIn .4s ease-out}.animate-fade-in-up{animation:fadeInUp .5s ease-out}.animate-slide-in-left{animation:slideInLeft .4s ease-out}.animate-slide-in-right{animation:slideInRight .4s ease-out}.animate-scale-in{animation:scaleIn .3s ease-out}.app{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-elevated);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;transition:width var(--transition-slow),transform var(--transition-slow);overflow:hidden}.sidebar-brand{padding:1.25rem;display:flex;align-items:center;gap:.75rem;border-bottom:1px solid var(--border-light);min-height:64px}.sidebar-brand-icon{width:36px;height:36px;border-radius:var(--radius);background:var(--primary-gradient);display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;box-shadow:var(--shadow-primary)}.sidebar-brand-text{font-size:1rem;font-weight:700;color:var(--text);white-space:nowrap;overflow:hidden}.sidebar-brand-sub{font-size:.7rem;color:var(--text-light);font-weight:400;white-space:nowrap}.sidebar-nav{flex:1;padding:.75rem;overflow-y:auto}.sidebar-nav-section{margin-bottom:1.5rem}.sidebar-nav-label{font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);padding:.5rem .75rem;white-space:nowrap;overflow:hidden}.sidebar-nav-item{display:flex;align-items:center;gap:.75rem;padding:.625rem .75rem;border-radius:var(--radius);color:var(--text-secondary);text-decoration:none;font-size:.875rem;font-weight:500;transition:all var(--transition);margin-bottom:2px;white-space:nowrap;overflow:hidden;position:relative}.sidebar-nav-item:hover{background:var(--primary-light);color:var(--primary)}.sidebar-nav-item.active{background:var(--primary-light);color:var(--primary);font-weight:600}.sidebar-nav-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:60%;border-radius:0 3px 3px 0;background:var(--primary)}.sidebar-nav-item svg{flex-shrink:0;width:18px;height:18px}.sidebar-footer{padding:.75rem;border-top:1px solid var(--border-light)}.sidebar-user{display:flex;align-items:center;gap:.75rem;padding:.625rem .75rem;border-radius:var(--radius);transition:background var(--transition)}.sidebar-user:hover{background:var(--bg)}.sidebar-avatar{width:32px;height:32px;border-radius:50%;background:var(--primary-gradient);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.8rem;font-weight:600;flex-shrink:0}.sidebar-user-info{flex:1;overflow:hidden}.sidebar-user-name{font-size:.8rem;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user-role{font-size:.7rem;color:var(--text-light)}.main-wrapper{flex:1;margin-left:var(--sidebar-width);min-height:100vh;transition:margin-left var(--transition-slow)}.main-header{background:var(--bg-elevated);border-bottom:1px solid var(--border);padding:0 2rem;height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:50}.main-header-title{font-size:1.125rem;font-weight:700;color:var(--text)}.main-header-actions{display:flex;align-items:center;gap:.75rem}.main-content{flex:1;padding:1.5rem 2rem;max-width:1400px;width:100%;margin:0 auto;animation:fadeIn .3s ease-out}.menu-toggle{display:none;background:none;border:none;padding:.5rem;color:var(--text);cursor:pointer;border-radius:var(--radius-sm);transition:background var(--transition)}.menu-toggle:hover{background:var(--bg)}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0000004d;z-index:99;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.login-page{min-height:100vh;display:flex;background:var(--bg)}.login-hero{flex:1;background:var(--primary-gradient);background-size:200% 200%;animation:gradientShift 8s ease infinite;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem;position:relative;overflow:hidden}.login-hero:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 20% 50%,rgba(255,255,255,.12) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(255,255,255,.08) 0%,transparent 40%),radial-gradient(circle at 60% 80%,rgba(255,255,255,.06) 0%,transparent 40%)}.login-hero-content{position:relative;z-index:1;text-align:center;color:#fff;max-width:480px}.login-hero-icon{width:80px;height:80px;border-radius:var(--radius-xl);background:#ffffff26;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:center;margin:0 auto 2rem;border:1px solid rgba(255,255,255,.2)}.login-hero h1{font-size:2rem;font-weight:800;margin-bottom:1rem;letter-spacing:-.02em}.login-hero p{font-size:1rem;opacity:.85;line-height:1.8}.login-hero-features{margin-top:2.5rem;display:flex;flex-direction:column;gap:1rem;text-align:left}.login-hero-feature{display:flex;align-items:center;gap:.75rem;font-size:.9rem;opacity:.9}.login-hero-feature-icon{width:32px;height:32px;border-radius:50%;background:#ffffff26;display:flex;align-items:center;justify-content:center;flex-shrink:0}.login-form-wrapper{width:480px;display:flex;align-items:center;justify-content:center;padding:2rem}.login-form{width:100%;max-width:360px;animation:fadeInUp .5s ease-out}.login-form-header{margin-bottom:2rem}.login-form-header h2{font-size:1.5rem;font-weight:700;color:var(--text);margin-bottom:.5rem}.login-form-header p{color:var(--text-light);font-size:.875rem}.login-field{margin-bottom:1.25rem}.login-field label{display:block;font-size:.8rem;font-weight:600;color:var(--text-secondary);margin-bottom:.5rem}.login-field input{width:100%;padding:.75rem 1rem;border:1.5px solid var(--border);border-radius:var(--radius);font-size:.9rem;transition:all var(--transition);background:var(--bg-elevated);color:var(--text)}.login-field input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4f6ef71f}.login-field input::placeholder{color:var(--text-muted)}.login-error{padding:.75rem 1rem;background:var(--danger-light);border:1px solid rgba(239,68,68,.2);border-radius:var(--radius);color:var(--danger);font-size:.8rem;margin-bottom:1rem;animation:scaleIn .2s ease-out}.login-submit{width:100%;padding:.75rem 1.5rem;border:none;border-radius:var(--radius);background:var(--primary-gradient);color:#fff;font-size:.9rem;font-weight:600;cursor:pointer;transition:all var(--transition);box-shadow:var(--shadow-primary);display:flex;align-items:center;justify-content:center;gap:.5rem}.login-submit:hover{transform:translateY(-1px);box-shadow:0 6px 20px #4f6ef766}.login-submit:active{transform:translateY(0)}.login-submit:disabled{opacity:.7;cursor:not-allowed;transform:none}.login-switch{text-align:center;margin-top:1.5rem;font-size:.8rem;color:var(--text-light)}.login-switch button{background:none;border:none;color:var(--primary);cursor:pointer;font-weight:600;font-size:.8rem;transition:color var(--transition)}.login-switch button:hover{color:var(--primary-hover);text-decoration:underline}.card{background:var(--card);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow);border:1px solid var(--border-light);margin-bottom:1.5rem;transition:box-shadow var(--transition),border-color var(--transition)}.card:hover{box-shadow:var(--shadow-md)}.card-title{font-size:1rem;font-weight:700;margin-bottom:1rem;display:flex;align-items:center;gap:.625rem;color:var(--text)}.card-title svg{color:var(--primary)}.card-subtitle{font-size:.8rem;color:var(--text-light);font-weight:400;margin-left:auto}.btn{padding:.5rem 1.125rem;border:none;border-radius:var(--radius);cursor:pointer;font-size:.8rem;font-weight:600;transition:all var(--transition);display:inline-flex;align-items:center;gap:.5rem;line-height:1.4;white-space:nowrap}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:var(--shadow-xs)}.btn-primary:hover{box-shadow:var(--shadow-primary);transform:translateY(-1px)}.btn-success{background:var(--success);color:#fff}.btn-success:hover{background:#059669;box-shadow:0 4px 12px #10b9814d}.btn-warning{background:var(--warning);color:#fff}.btn-warning:hover{background:#d97706}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:#dc2626;box-shadow:0 4px 12px #ef44444d}.btn-outline{background:var(--bg-elevated);border:1.5px solid var(--border);color:var(--text-secondary)}.btn-outline:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg);color:var(--text)}.btn-sm{padding:.375rem .75rem;font-size:.75rem}.btn-lg{padding:.75rem 1.5rem;font-size:.9rem}.btn-icon{padding:.5rem;border-radius:var(--radius)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.input{width:100%;padding:.625rem 1rem;border:1.5px solid var(--border);border-radius:var(--radius);font-size:.85rem;transition:all var(--transition);background:var(--bg-elevated);color:var(--text)}.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4f6ef71a}.input::placeholder{color:var(--text-muted)}.select{width:100%;padding:.625rem 2.5rem .625rem 1rem;border:1.5px solid var(--border);border-radius:var(--radius);font-size:.85rem;transition:all var(--transition);background:var(--bg-elevated);color:var(--text);cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b95a8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .75rem center}.select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4f6ef71a}.textarea{width:100%;padding:.75rem 1rem;border:1.5px solid var(--border);border-radius:var(--radius);font-size:.85rem;resize:vertical;min-height:100px;font-family:inherit;transition:all var(--transition);background:var(--bg-elevated);color:var(--text)}.textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4f6ef71a}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1.5rem}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}.stat-card{background:var(--card);border-radius:var(--radius-lg);padding:1.25rem;border:1px solid var(--border-light);box-shadow:var(--shadow-xs);transition:all var(--transition)}.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.stat-card-icon{width:40px;height:40px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;margin-bottom:.75rem}.stat-card-value{font-size:1.5rem;font-weight:800;color:var(--text);line-height:1.2}.stat-card-label{font-size:.75rem;color:var(--text-light);margin-top:.25rem}.stat-card-desc{font-size:.7rem;margin-top:.5rem;padding-top:.5rem;border-top:1px solid var(--border-light)}.badge{display:inline-flex;align-items:center;gap:.25rem;padding:.2rem .6rem;border-radius:100px;font-size:.7rem;font-weight:600;white-space:nowrap}.badge-primary{background:var(--primary-light);color:var(--primary)}.badge-success{background:var(--success-light);color:var(--success)}.badge-warning{background:var(--warning-light);color:var(--warning)}.badge-danger{background:var(--danger-light);color:var(--danger)}.badge-info{background:var(--info-light);color:var(--info)}.bloom-1{background:#dbeafe;color:#1e40af}.bloom-2{background:#e0e7ff;color:#3730a3}.bloom-3{background:#d1fae5;color:#065f46}.bloom-4{background:#fef3c7;color:#92400e}.bloom-5{background:#fce7f3;color:#9d174d}.bloom-6{background:#ede9fe;color:#5b21b6}.solo-1{background:#f1f5f9;color:#475569}.solo-2{background:#dbeafe;color:#1e40af}.solo-3{background:#d1fae5;color:#065f46}.solo-4{background:#fef3c7;color:#92400e}.solo-5{background:#ede9fe;color:#5b21b6}.table-wrapper{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border-light)}.table{width:100%;border-collapse:collapse;font-size:.85rem}.table th{background:var(--bg);padding:.75rem 1rem;text-align:left;font-weight:600;font-size:.75rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em;border-bottom:1px solid var(--border)}.table td{padding:.75rem 1rem;border-bottom:1px solid var(--border-light);color:var(--text)}.table tr:last-child td{border-bottom:none}.table tr:hover td{background:var(--bg)}.loading-spinner{width:24px;height:24px;border:2.5px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite}.loading-page{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:1rem;color:var(--text-light);font-size:.9rem}.loading-page .loading-spinner{width:36px;height:36px;border-width:3px}.skeleton{background:linear-gradient(90deg,var(--border-light) 25%,var(--bg) 50%,var(--border-light) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}.skeleton-text{height:14px;margin-bottom:.5rem;width:80%}.skeleton-title{height:20px;margin-bottom:.75rem;width:50%}.skeleton-card{height:120px;border-radius:var(--radius-lg)}.empty-state{text-align:center;padding:3rem 1.5rem;color:var(--text-light)}.empty-state-icon{width:64px;height:64px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;color:var(--text-muted)}.empty-state h3{font-size:1rem;font-weight:600;color:var(--text-secondary);margin-bottom:.5rem}.empty-state p{font-size:.85rem;margin-bottom:1.5rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:200;animation:fadeIn .2s ease-out}.modal{background:var(--card);border-radius:var(--radius-xl);padding:1.5rem;width:90%;max-width:500px;max-height:85vh;overflow-y:auto;box-shadow:var(--shadow-xl);animation:scaleIn .25s ease-out}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.25rem}.modal-title{font-size:1.1rem;font-weight:700}.modal-close{background:none;border:none;padding:.375rem;cursor:pointer;color:var(--text-light);border-radius:var(--radius-sm);transition:all var(--transition)}.modal-close:hover{background:var(--bg);color:var(--text)}.toast{position:fixed;top:1.5rem;right:1.5rem;padding:.75rem 1.25rem;border-radius:var(--radius);box-shadow:var(--shadow-lg);z-index:300;animation:slideInRight .3s ease-out;font-size:.85rem;font-weight:500;display:flex;align-items:center;gap:.5rem}.toast-success{background:var(--success);color:#fff}.toast-error{background:var(--danger);color:#fff}.toast-warning{background:var(--warning);color:#fff}.progress-bar{height:6px;background:var(--border-light);border-radius:100px;overflow:hidden}.progress-bar-fill{height:100%;border-radius:100px;transition:width var(--transition-slow);background:var(--primary-gradient)}.drag-handle{cursor:grab;color:var(--text-muted);padding:.25rem;border-radius:var(--radius-sm);transition:color var(--transition)}.drag-handle:hover{color:var(--text-secondary)}.drag-handle:active{cursor:grabbing}.tabs{display:flex;gap:.25rem;border-bottom:1px solid var(--border);margin-bottom:1.5rem}.tab{padding:.625rem 1rem;border:none;background:none;color:var(--text-light);cursor:pointer;font-size:.85rem;font-weight:500;border-bottom:2px solid transparent;margin-bottom:-1px;transition:all var(--transition)}.tab:hover{color:var(--text)}.tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}@media (max-width: 1024px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:1fr 1fr}}@media (max-width: 768px){:root{--sidebar-width: 0px}.sidebar{transform:translate(-100%);width:260px}.sidebar.open{transform:translate(0)}.sidebar-overlay.show{display:block}.menu-toggle{display:flex}.main-wrapper{margin-left:0}.main-content{padding:1rem}.main-header{padding:0 1rem}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.login-page{flex-direction:column}.login-hero{display:none}.login-form-wrapper{width:100%}.card{padding:1.25rem}}@media (max-width: 480px){.main-content{padding:.75rem}.btn{padding:.45rem .875rem;font-size:.75rem}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:100px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}::selection{background:#4f6ef726;color:var(--text)}.problem-chain{display:flex;flex-direction:column;gap:1rem}.problem-item{background:var(--bg);border:1px solid var(--border-light);border-radius:var(--radius);padding:1rem;transition:all var(--transition);cursor:move}.problem-item:hover{border-color:var(--primary);box-shadow:var(--shadow)}.problem-item.dragging{opacity:.5;transform:scale(.98)}.problem-header{display:flex;align-items:flex-start;gap:.75rem;margin-bottom:.75rem}.problem-number{width:32px;height:32px;border-radius:50%;background:var(--primary-gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.875rem;flex-shrink:0;box-shadow:var(--shadow-primary)}.problem-content{flex:1;display:flex;flex-direction:column;gap:.5rem}.problem-question input{font-weight:500}.problem-meta{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}.animate-spin{animation:spin .6s linear infinite}.form-group{margin-bottom:1rem}.form-label{display:block;font-size:.8rem;font-weight:600;color:var(--text-secondary);margin-bottom:.5rem}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}@media (max-width: 640px){.form-row{grid-template-columns:1fr}}.divider{height:1px;background:var(--border);margin:1.5rem 0}[data-tooltip]{position:relative}[data-tooltip]:hover:after{content:attr(data-tooltip);position:absolute;bottom:100%;left:50%;transform:translate(-50%);padding:.375rem .625rem;background:var(--text);color:#fff;font-size:.7rem;border-radius:var(--radius-sm);white-space:nowrap;z-index:100;margin-bottom:.5rem;animation:fadeIn .2s ease-out}