@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--font-sans:"Inter", system-ui, -apple-system, sans-serif;--bg-main:#f0f7ff;--bg-card:#fff;--sidebar-bg-from:#0f172a;--sidebar-bg-to:#1e3a8a;--sidebar-text:#ffffffd9;--sidebar-text-active:#fff;--sidebar-active-bg:#ffffff38;--sidebar-hover-bg:#ffffff1f;--sidebar-border:#ffffff26;--sidebar-indicator:#3b82f6;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#dbeafe;--primary-text:#1e3a8a;--text-main:#1e293b;--text-muted:#64748b;--border:#e2e8f0;--border-focus:#93c5fd;--success:#34d399;--success-bg:#ecfdf5;--warning:#fbbf24;--warning-bg:#fffbeb;--danger:#f87171;--danger-bg:#fef2f2;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #00000014, 0 2px 4px -1px #0000000a;--shadow-lg:0 10px 24px -4px #2563eb1f, 0 4px 8px -4px #2563eb0f;--radius-sm:6px;--radius-md:10px;--radius-lg:14px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-main);color:var(--text-main);-webkit-font-smoothing:antialiased;line-height:1.5}.app-container{min-height:100vh;display:flex}.sidebar{background:linear-gradient(175deg, var(--sidebar-bg-from) 0%, var(--sidebar-bg-to) 100%);z-index:10;border-right:none;flex-direction:column;width:264px;height:100vh;display:flex;position:sticky;top:0;box-shadow:4px 0 24px #0000002e}.sidebar-header{border-bottom:1px solid var(--sidebar-border);align-items:center;gap:12px;padding:22px 20px 18px;display:flex}.sidebar-logo-badge{color:#fff;background:linear-gradient(135deg,#3b82f6,#1d4ed8);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;font-size:1.1rem;font-weight:700;display:flex;box-shadow:0 2px 8px #2563eb66}.logo-text{color:#fff;letter-spacing:-.02em;font-size:1.05rem;font-weight:800;line-height:1.2}.logo-subtext{color:var(--sidebar-text);margin-top:1px;font-size:.7rem;font-weight:600}.sidebar-section-label{letter-spacing:.1em;text-transform:uppercase;color:#ffffff59;padding:12px 20px 4px;font-size:.65rem;font-weight:700}.sidebar-menu{scrollbar-width:thin;scrollbar-color:#ffffff1a transparent;flex-direction:column;flex:1;gap:2px;padding:8px 10px;list-style:none;display:flex;overflow-y:auto}.sidebar-menu::-webkit-scrollbar{width:4px}.sidebar-menu::-webkit-scrollbar-track{background:0 0}.sidebar-menu::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:4px}.menu-item a{color:var(--sidebar-text);border-left:3px solid #0000;border-radius:8px;align-items:center;gap:10px;padding:10px 14px;font-size:.93rem;font-weight:600;text-decoration:none;transition:all .18s;display:flex;position:relative}.menu-item a:hover{background-color:var(--sidebar-hover-bg);color:#fff;border-left-color:#60a5fa80}.menu-item a.active{background-color:var(--sidebar-active-bg);color:var(--sidebar-text-active);border-left:4px solid var(--sidebar-indicator);font-weight:700;box-shadow:inset 0 0 0 1px #60a5fa33}.sidebar-footer{border-top:1px solid var(--sidebar-border);flex-direction:column;gap:8px;padding:12px 10px;display:flex}.sidebar-user-card{cursor:default;background:#ffffff12;border-radius:10px;align-items:center;gap:10px;padding:10px 12px;display:flex}.sidebar-avatar{color:#fff;background:linear-gradient(135deg,#3b82f6,#8b5cf6);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:.95rem;font-weight:700;display:flex}.sidebar-user-info{flex:1;min-width:0}.user-name{color:#fff;white-space:nowrap;text-overflow:ellipsis;font-size:.88rem;font-weight:700;display:block;overflow:hidden}.user-role{color:var(--sidebar-text);margin-top:1px;font-size:.72rem;display:block}.sidebar-logout-btn{color:#fee2e2;cursor:pointer;text-align:center;background:#ef44442e;border:1px solid #ef444459;border-radius:8px;justify-content:center;align-items:center;gap:8px;width:100%;padding:9px 14px;font-family:inherit;font-size:.88rem;font-weight:700;transition:all .18s;display:flex}.sidebar-logout-btn:hover{color:#fff;background:#ef444438;border-color:#ef444480;transform:translate(2px)}.main-content{flex-direction:column;flex:1;min-width:0;display:flex}.top-bar{background-color:var(--bg-card);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;height:64px;padding:0 24px;display:flex}.page-title{color:var(--text-main);font-size:1.25rem;font-weight:600}.content-body{flex:1;padding:24px;overflow-y:auto}.card{background-color:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);margin-bottom:24px;padding:24px;transition:transform .2s,box-shadow .2s}.card:hover{box-shadow:var(--shadow-md)}.form-group{margin-bottom:16px}.form-label{color:var(--text-main);margin-bottom:6px;font-size:.875rem;font-weight:500;display:block}.form-input,.form-select,.form-textarea{background-color:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-main);padding:10px 14px;font-family:inherit;font-size:.95rem;transition:border-color .2s,box-shadow .2s}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #2563eb26}.btn{border-radius:var(--radius-sm);cursor:pointer;border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-family:inherit;font-size:.95rem;font-weight:700;text-decoration:none;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover)}.btn-secondary{border-color:var(--border);color:var(--text-main);background-color:#fff}.btn-secondary:hover{border-color:var(--text-muted);background-color:#f8fafc}.btn-danger{background-color:var(--danger-bg);border-color:var(--danger);color:#b91c1c}.btn-danger:hover{background-color:#fee2e2}.btn-success{background-color:var(--success-bg);border-color:var(--success);color:#065f46}.btn-success:hover{background-color:#d1fae5}.table-container{border:1px solid var(--border);border-radius:var(--radius-md);background-color:var(--bg-card);overflow-x:auto}.table{border-collapse:collapse;text-align:left;width:100%}.table th{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--border);background-color:#f8fafc;padding:14px 18px;font-size:.8rem;font-weight:600}.table td{border-bottom:1px solid var(--border);padding:14px 18px;font-size:.95rem}.table tr:last-child td{border-bottom:none}.table tr:hover td{background-color:#f8fafc}.badge{text-transform:uppercase;border-radius:9999px;align-items:center;padding:4px 8px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-primary{background-color:var(--primary-light);color:var(--primary-text)}.badge-success{background-color:var(--success-bg);color:#065f46}.badge-warning{background-color:var(--warning-bg);color:#92400e}.badge-danger{background-color:var(--danger-bg);color:#991b1b}.modal-overlay{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:100;background-color:#0f172a66;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.modal-content{background-color:var(--bg-card);border-radius:var(--radius-lg);width:100%;max-width:500px;animation:.2s cubic-bezier(.16,1,.3,1) modalEnter;overflow:hidden;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a}@keyframes modalEnter{0%{opacity:0;transform:scale(.95)translateY(10px)}to{opacity:1;transform:scale(1)translateY(0)}}.modal-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:20px 24px;display:flex}.modal-title{font-size:1.15rem;font-weight:600}.modal-close{cursor:pointer;color:var(--text-muted);background:0 0;border:none;font-size:1.5rem}.modal-body{padding:24px}.modal-footer{border-top:1px solid var(--border);background-color:#f8fafc;justify-content:flex-end;gap:12px;padding:16px 24px;display:flex}.success-checkmark{color:#fff;background-color:#10b981;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-size:14px;font-weight:700;display:inline-flex}.mobile-header{background-color:var(--bg-card);border-bottom:1px solid var(--border);z-index:10;justify-content:space-between;align-items:center;height:56px;padding:0 16px;display:none;position:sticky;top:0}.bottom-nav{background-color:var(--bg-card);border-top:1px solid var(--border);z-index:10;justify-content:space-around;align-items:center;height:60px;display:none;position:fixed;bottom:0;left:0;right:0}.bottom-nav-item{color:var(--text-muted);flex-direction:column;align-items:center;gap:4px;font-size:.75rem;font-weight:500;text-decoration:none;display:flex}.bottom-nav-item.active{color:var(--primary)}.bottom-nav-item svg{width:20px;height:20px}@media (width<=768px){.sidebar{display:none}.mobile-header,.bottom-nav{display:flex}.app-container{flex-direction:column;padding-bottom:60px}.content-body{padding:16px}.top-bar{display:none}}.toast-container{z-index:9999;flex-direction:column;gap:10px;width:100%;max-width:360px;display:flex;position:fixed;top:24px;right:24px}.toast{border-radius:var(--radius-md);border-left:5px solid #0000;align-items:center;gap:12px;padding:16px;font-size:.95rem;font-weight:500;animation:.3s cubic-bezier(.16,1,.3,1) forwards toastSlideIn;display:flex;box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d}.toast-success{color:#065f46;background-color:#ecfdf5;border:1px solid #a7f3d0;border-left-color:#10b981}.toast-error{color:#991b1b;background-color:#fef2f2;border:1px solid #fecaca;border-left-color:#ef4444}.toast-loading{color:#1e3a8a;background-color:#f0f7ff;border:1px solid #bfdbfe;border-left-color:#3b82f6}@keyframes toastSlideIn{0%{opacity:0;transform:translateY(-20px)scale(.95)}to{opacity:1;transform:translateY(0)scale(1)}}.animate-spin{animation:1s linear infinite spin;display:inline-block}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.mobile-lesson-selector{display:none}@media (width<=768px){.mobile-lesson-selector{display:block}}.student-portal-content{font-size:16px!important}.student-portal-content h1,.student-portal-content h2{color:var(--primary-text)!important;font-size:24px!important;font-weight:700!important}.student-portal-content h3{font-size:20px!important;font-weight:600!important}.student-portal-content .card{padding:28px!important}.student-portal-content .btn{padding:12px 20px!important;font-size:16px!important;font-weight:700!important}.student-portal-content p,.student-portal-content td,.student-portal-content div{font-size:16px}.btn-purple{color:#6b21a8;background-color:#f3e8ff;border-color:#d8b4fe}.btn-purple:hover{background-color:#fae8ff}.btn-info{color:#0891b2;background-color:#ecfeff;border-color:#a5f3fc}.btn-info:hover{background-color:#e0f7fa}.btn-dark-success{color:#fff;background-color:#059669;border-color:#059669}.btn-dark-success:hover{background-color:#047857;border-color:#047857}.btn-gray{color:#475569;background-color:#f1f5f9;border-color:#cbd5e1}.btn-gray:hover{background-color:#e2e8f0}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-pulse{animation:2s cubic-bezier(.4,0,.6,1) infinite pulse}.skeleton{border-radius:var(--radius-sm);background-color:#e2e8f0;width:100%;height:1em;display:inline-block}.skeleton-text{background-color:#cbd5e1;height:12px;margin-bottom:8px}.skeleton-title{background-color:#cbd5e1;width:50%;height:20px;margin-bottom:12px}.skeleton-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);margin-bottom:16px;padding:20px}.skeleton-button{border-radius:var(--radius-sm);background-color:#cbd5e1;width:100px;height:38px}.skeleton-circle{background-color:#cbd5e1;border-radius:50%;width:40px;height:40px;display:inline-block}