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:root{--background:#fff;--foreground:#1a1a1a;--primary:#2563eb;--primary-hover:#1d4ed8;--secondary:#64748b;--accent:#f59e0b;--success:#10b981;--error:#ef4444;--surface:#f8fafc;--border:#e2e8f0;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -4px #0000001a;--glass:#ffffffb3;--glass-border:#ffffff4d}[data-theme=dark]{--background:#0f172a;--foreground:#f8fafc;--surface:#1e293b;--border:#334155;--glass:#0f172ab3;--glass-border:#ffffff1a}*{box-sizing:border-box;margin:0;padding:0}a{color:inherit;text-decoration:none}@media (prefers-color-scheme:dark){html{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}body{background:var(--background);color:var(--foreground);font-family:Inter,sans-serif}.premium-card{border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);background:#fff;transition:all .3s}.glass{background:var(--glass);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border)}.btn-primary{background:var(--primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;display:inline-flex}.teacher-app-layout{min-height:100vh;display:flex}.teacher-sidebar{border-right:1px solid var(--border);flex-direction:column;width:260px;height:100vh;padding:2rem 1.5rem;display:flex;position:sticky;top:0}.sidebar-header h2{color:var(--primary);margin-bottom:3rem;font-size:1.25rem}.sidebar-links{flex-direction:column;flex:1;gap:.5rem;list-style:none;display:flex}.sidebar-links a{border-radius:var(--radius-md);color:var(--secondary);padding:.75rem 1rem;transition:all .2s;display:block}.sidebar-links a:hover,.sidebar-links a.active{background:var(--primary);color:#fff}.sidebar-footer{border-top:1px solid var(--border);padding-top:2rem}.teacher-content{background:#fafafa;flex:1;padding:2rem 3rem}.dashboard-container{max-width:1200px}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem;margin-top:2rem;display:grid}.stat-card{align-items:center;gap:1.5rem;padding:1.5rem;display:flex}.stat-icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:50px;height:50px;display:flex}.admin-table{border-collapse:collapse;width:100%}.admin-table th{text-align:left;color:var(--secondary);border-bottom:1px solid var(--border);background:#f8fafc;padding:1rem 1.5rem;font-size:.875rem}.status-container{background:var(--surface);justify-content:center;align-items:center;min-height:100vh;padding:1rem;display:flex}.icon-wrapper{justify-content:center;margin-bottom:2rem;display:flex}.btn-ghost{border:1px solid var(--border);color:var(--secondary);border-radius:var(--radius-md);justify-content:center;align-items:center;padding:.75rem 1.5rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-ghost:hover{background:var(--surface);border-color:var(--secondary)}