*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #6366F1;--primary-hover: #4F46E5;--primary-light: #EEF2FF;--primary-mid: #C7D2FE;--primary-dark: #3730A3;--green: #10B981;--green-light: #ECFDF5;--green-dark: #065F46;--amber: #F59E0B;--amber-light: #FFFBEB;--amber-dark: #92400E;--red: #EF4444;--red-light: #FEF2F2;--red-dark: #991B1B;--blue: #3B82F6;--blue-light: #EFF6FF;--blue-dark: #1E40AF;--bg: #F8FAFC;--surface: #FFFFFF;--border: #E2E8F0;--border-hover: #CBD5E1;--t1: #0F172A;--t2: #475569;--t3: #94A3B8;--sidebar: #0F172A;--sidebar-hover: rgba(255,255,255,.06);--sidebar-active: rgba(99,102,241,.2);--sidebar-text: #94A3B8;--radius: 14px;--radius-sm: 10px;--radius-xs: 7px;--shadow-sm: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);--shadow: 0 4px 6px rgba(15,23,42,.04), 0 2px 4px rgba(15,23,42,.03);--shadow-md: 0 10px 24px rgba(15,23,42,.08), 0 4px 8px rgba(15,23,42,.04)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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12px;border-radius:var(--radius-xs);color:var(--sidebar-text);text-decoration:none;font-size:13.5px;font-weight:450;transition:all .15s ease;cursor:pointer;margin-bottom:2px;letter-spacing:-.1px}.sidebar-nav a:hover{background:var(--sidebar-hover);color:#e2e8f0}.sidebar-nav a.active{background:var(--sidebar-active);color:#a5b4fc;font-weight:600;box-shadow:inset 3px 0 0 var(--primary)}.sidebar-bottom{padding:12px 10px 20px;border-top:1px solid rgba(255,255,255,.06)}.sidebar-signout{display:flex;align-items:center;gap:10px;padding:10px 12px;color:var(--sidebar-text);cursor:pointer;font-size:13px;border-radius:var(--radius-xs);transition:all .15s}.sidebar-signout:hover{background:var(--sidebar-hover);color:#e2e8f0}.sidebar-role{margin:8px 0 0;padding:8px 14px;border-radius:var(--radius-xs);font-size:12px;font-weight:600;color:#fff;text-align:center;letter-spacing:.3px;text-transform:uppercase}.main{margin-left:240px;flex:1;display:flex;flex-direction:column;min-height:100vh}.topbar{height:60px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 28px;position:sticky;top:0;z-index:50;box-shadow:var(--shadow-sm)}.avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--primary) 0%,#818CF8 100%);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff;cursor:pointer;flex-shrink:0;box-shadow:0 2px 8px #6366f159}.page-content{padding:28px 32px;flex:1;max-width:1200px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;box-shadow:var(--shadow-sm)}.card-title{font-size:15px;font-weight:650;color:var(--t1);margin-bottom:18px;letter-spacing:-.2px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:28px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;transition:box-shadow .2s,transform 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td{border-bottom:none}tr:hover td{background:#fafbfc}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:99px;font-size:11.5px;font-weight:600;letter-spacing:.1px}.badge-green{background:var(--green-light);color:var(--green-dark)}.badge-amber{background:var(--amber-light);color:var(--amber-dark)}.badge-red{background:var(--red-light);color:var(--red-dark)}.badge-blue{background:var(--blue-light);color:var(--blue-dark)}.badge-purple{background:var(--primary-light);color:var(--primary-dark)}.badge-gray{background:#f1f5f9;color:var(--t2)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 18px;border-radius:var(--radius-sm);font-size:13.5px;font-weight:600;cursor:pointer;border:none;transition:all .15s ease;letter-spacing:-.1px;white-space:nowrap}.btn:hover{opacity:.9;transform:translateY(-1px);box-shadow:var(--shadow-sm)}.btn:active{transform:translateY(0);opacity:1}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px #6366f14d}.btn-primary:hover{background:var(--primary-hover);box-shadow:0 4px 12px #6366f166}.btn-secondary{background:var(--surface);color:var(--t1);border:1px solid var(--border)}.btn-danger{background:var(--red-light);color:var(--red-dark)}.btn-success{background:var(--green-light);color:var(--green-dark)}.btn-sm{padding:6px 13px;font-size:12px;border-radius:var(--radius-xs)}.btn-lg{padding:12px 24px;font-size:15px;border-radius:var(--radius)}.form-group{margin-bottom:18px}.form-label{display:block;font-size:13px;font-weight:550;color:var(--t1);margin-bottom:6px}.form-input{width:100%;padding:10px 14px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;color:var(--t1);font-family:inherit;transition:border-color .15s,box-shadow .15s;outline:none}.form-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f11f;background:#fff}.form-input::placeholder{color:var(--t3)}.form-select{width:100%;padding:10px 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var(--primary)}.class-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;border-left:4px solid var(--primary);transition:box-shadow .2s,transform .2s;box-shadow:var(--shadow-sm)}.class-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.class-name{font-size:15px;font-weight:650;color:var(--t1);margin-bottom:6px;letter-spacing:-.2px}.class-meta{font-size:12.5px;color:var(--t2);margin-bottom:3px}.grid-2{display:grid;grid-template-columns:1fr 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52px;display:flex;flex-direction:column;justify-content:center;position:relative;overflow:hidden}.login-left:before{content:"";position:absolute;top:-100px;right:-100px;width:400px;height:400px;border-radius:50%;background:#6366f133}.login-left:after{content:"";position:absolute;bottom:-80px;left:-80px;width:300px;height:300px;border-radius:50%;background:#a5b4fc1a}.login-right{flex:1;display:flex;align-items:center;justify-content:center;padding:40px;background:var(--bg)}.login-form{width:100%;max-width:420px}.login-card{background:#fff;border-radius:20px;padding:40px;box-shadow:var(--shadow-md)}.role-tabs{display:flex;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;margin-bottom:20px}.role-tab{flex:1;padding:10px;text-align:center;cursor:pointer;font-size:13.5px;font-weight:500;color:var(--t2);transition:all .15s}.role-tab.active{background:var(--primary);color:#fff;font-weight:600}.empty-state{text-align:center;padding:60px 20px;color:var(--t2)}.empty-state-icon{font-size:44px;margin-bottom:16px;opacity:.25}.empty-state-title{font-size:17px;font-weight:600;color:var(--t1);margin-bottom:8px}.workflow-steps{display:flex;align-items:stretch;background:var(--primary-light);border:1px solid var(--primary-mid);border-radius:var(--radius);overflow:hidden;margin-bottom:24px}.workflow-step{flex:1;padding:16px 20px;text-align:center;border-right:1px solid var(--primary-mid)}.workflow-step:last-child{border-right:none}.workflow-step-num{width:30px;height:30px;border-radius:50%;background:var(--primary);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 8px}.workflow-step-title{font-size:13px;font-weight:650;color:var(--primary-dark);margin-bottom:3px}.workflow-step-desc{font-size:11.5px;color:var(--primary-dark);opacity:.75}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}