@import"https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;900&display=swap";*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Noto Sans SC,-apple-system,BlinkMacSystemFont,sans-serif;font-size:14px;color:#0f172a;background:#f1f5f9;min-height:100vh;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}#root{min-height:100vh}:root{--blue: #2563eb;--blue-dk: #1d4ed8;--blue-lt: #eff6ff;--green: #059669;--red: #dc2626;--amber: #d97706;--purple: #7c3aed;--border: #e2e8f0;--surface: #ffffff;--bg: #f1f5f9;--text: #0f172a;--muted: #64748b;--faint: #94a3b8;--radius: 12px;--shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.06);--shadow-lg: 0 8px 32px rgba(0,0,0,.12)}.app{display:flex;min-height:100vh}.sidebar{width:232px;min-width:232px;background:#0f172a;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow:hidden;z-index:20}.sidebar-logo{padding:22px 20px 18px;border-bottom:1px solid #1e293b;display:flex;align-items:center;gap:10px}.sidebar-logo-icon{width:36px;height:36px;background:linear-gradient(135deg,#2563eb,#7c3aed);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.sidebar-logo-text h1{font-size:14px;font-weight:700;color:#f8fafc}.sidebar-logo-text p{font-size:11px;color:#475569;margin-top:1px}.sidebar-nav{flex:1;padding:10px 0;overflow-y:auto}.nav-group{margin-bottom:4px}.nav-label{padding:10px 20px 4px;font-size:10px;font-weight:700;letter-spacing:1.2px;color:#334155;text-transform:uppercase}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 20px;margin:1px 8px;border-radius:8px;cursor:pointer;color:#64748b;font-size:13px;font-weight:500;transition:all .15s;-webkit-user-select:none;user-select:none}.nav-item:hover{background:#1e293b;color:#cbd5e1}.nav-item.active{background:#1e40af;color:#bfdbfe}.nav-item 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var(--border);padding:0 28px;height:56px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}.topbar-left{display:flex;align-items:center;gap:12px}.topbar-title{font-size:16px;font-weight:700;color:var(--text)}.topbar-badge{padding:3px 10px;border-radius:20px;background:var(--blue-lt);color:var(--blue);font-size:11px;font-weight:600}.topbar-right{display:flex;align-items:center;gap:8px}.topbar-stats{font-size:12px;color:var(--faint)}.content{flex:1;padding:24px 28px;max-width:1200px;width:100%}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:8px;border:none;font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;font-family:inherit;white-space:nowrap;letter-spacing:.1px}.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue-dk);transform:translateY(-1px);box-shadow:0 4px 12px 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16px;border-radius:10px;font-size:13px;border:1.5px solid}.alert-warning{background:#fffbeb;border-color:#fcd34d;color:#92400e}.alert-info{background:var(--blue-lt);border-color:#93c5fd;color:#1d4ed8}.alert-success{background:#f0fdf4;border-color:#6ee7b7;color:#065f46}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.empty{text-align:center;padding:56px 24px;color:var(--faint)}.empty-icon{font-size:48px;margin-bottom:14px;opacity:.6}.empty h3{font-size:15px;font-weight:600;color:var(--muted);margin-bottom:6px}.empty p{font-size:13px}.loading-screen{display:flex;align-items:center;justify-content:center;height:100vh;flex-direction:column;gap:16px;background:var(--bg)}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.setup-screen{max-width:600px;margin:60px auto;padding:0 24px}.setup-card{background:#fff;border-radius:16px;border:1px solid var(--border);padding:36px;box-shadow:var(--shadow)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(24px);opacity:0}to{transform:translateY(0);opacity:1}}.task-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin-bottom:10px;transition:box-shadow .15s}.task-card:hover{box-shadow:var(--shadow)}.task-card-title{font-size:15px;font-weight:700;color:var(--text)}.task-card-meta{font-size:12px;color:var(--faint);margin-top:4px}.task-card-actions{display:flex;gap:6px;flex-wrap:wrap}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}@media (max-width: 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8px;min-height:80px;border-radius:10px}.student-card .sname{font-size:13px}.student-card .sscore{font-size:18px}.student-card .sno{font-size:10px}.student-card .check{font-size:12px}.score-options{gap:8px}.score-opt{padding:10px 14px;font-size:18px;min-width:52px}.btn-sm{padding:5px 10px;font-size:12px}.tabs{overflow-x:auto;white-space:nowrap;-webkit-overflow-scrolling:touch}.tab{padding:9px 14px;font-size:12px}.toast-container{bottom:76px;right:10px;left:10px}.toast{max-width:100%}.task-card{padding:14px}.task-card-title{font-size:14px}.task-card-actions{margin-top:10px}.alert{font-size:12px;padding:10px 12px}.coef-table th,.coef-table td{padding:6px;font-size:12px}.mobile-tabbar{display:flex;position:fixed;bottom:0;left:0;right:0;height:60px;background:#fff;border-top:1px solid var(--border);z-index:50;box-shadow:0 -8px 24px #00000014;padding:0 6px;padding-bottom:env(safe-area-inset-bottom,0px)}.mobile-tab-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;cursor:pointer;border-radius:10px;margin:6px 2px;transition:background .15s;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}.mobile-tab-item:active{background:#f1f5f9}.mobile-tab-item.active{background:var(--blue-lt)}.mobile-tab-icon{font-size:20px;line-height:1}.mobile-tab-label{font-size:10px;font-weight:600;color:var(--muted)}.mobile-tab-item.active .mobile-tab-label{color:var(--blue)}.mobile-tab-item.active .mobile-tab-icon{filter:none}}@media (min-width: 769px){.mobile-tabbar{display:none}}@media (max-width: 375px){.grid-4{grid-template-columns:1fr 1fr}.student-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}.score-opt{padding:8px 12px;font-size:17px;min-width:46px}.mobile-tab-label{font-size:9px}.mobile-tab-icon{font-size:18px}}