@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";
:root{--primary:#0052ff;--primary-light:#3b82f6;--primary-dark:#0042f3;--primary-glow:#0052ff1f;--primary-50:#0052ff0a;--primary-100:#0052ff14;--secondary:#208400;--secondary-light:#6abf1a;--accent:#14b8a6;--danger:#ef4444;--danger-light:#fca5a5;--success:#16a34a;--warning:#f59e0b;--bg-primary:#f0f4f9;--bg-secondary:#fff;--bg-tertiary:#e8edf4;--bg-card:#fff;--bg-glass:#fff9;--text-primary:#1a2236;--text-secondary:#4b5c78;--text-muted:#8896ab;--border:#1e3c6e1a;--border-hover:#1e3c6e33;--shadow-sm:0 1px 3px #0000000d;--shadow-md:0 4px 16px #00000012;--shadow-lg:0 10px 30px #00000017;--shadow-card:0 1px 4px #0000000a, 0 4px 16px #0052ff0a;--shadow-glow:0 4px 20px #0052ff1f;--radius-sm:10px;--radius-md:14px;--radius-lg:18px;--radius-xl:24px;--transition:all .2s cubic-bezier(.4, 0, .2, 1);--transition-slow:all .3s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}a{color:var(--primary);transition:var(--transition);text-decoration:none}a:hover{color:var(--primary-dark)}.auth-container{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;display:flex;position:relative;overflow:hidden}.auth-container:before{content:"";background:radial-gradient(circle at 30%,#0052ff0f 0%,#0000 50%),radial-gradient(circle at 70%,#2084000a 0%,#0000 50%);width:200%;height:200%;animation:20s ease-in-out infinite float;position:absolute;top:-50%;left:-50%}@keyframes float{0%,to{transform:translate(0)rotate(0)}25%{transform:translate(2%,-2%)rotate(1deg)}50%{transform:translate(-1%,3%)rotate(-1deg)}75%{transform:translate(3%,1%)rotate(.5deg)}}.auth-card{background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:440px;box-shadow:var(--shadow-lg);z-index:1;padding:48px 40px;position:relative}.auth-logo{text-align:center;margin-bottom:8px}.auth-logo-img{object-fit:contain;border-radius:var(--radius-md);width:80px;height:80px;margin-bottom:8px}.auth-logo h1{background:linear-gradient(135deg, var(--primary), var(--primary-light), var(--secondary-light));-webkit-text-fill-color:transparent;letter-spacing:-.5px;-webkit-background-clip:text;background-clip:text;font-size:2.2rem;font-weight:800}.auth-logo p{color:var(--text-secondary);margin-top:4px;font-size:.9rem}.auth-title{text-align:center;color:var(--text-primary);margin-bottom:32px;font-size:1.3rem;font-weight:600}.form-group{margin-bottom:20px}.form-group label{color:var(--text-secondary);margin-bottom:6px;font-size:.85rem;font-weight:500;display:block}.form-group input,.form-group select,.form-group textarea{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);transition:var(--transition);outline:none;padding:12px 16px;font-family:inherit;font-size:.95rem}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.form-group input::placeholder{color:var(--text-muted)}.btn{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);white-space:nowrap;border:none;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-family:inherit;font-size:.95rem;font-weight:600;text-decoration:none;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;box-shadow:0 2px 8px #0052ff40}.btn-primary:hover{color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px #0052ff4d}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border-hover);border-color:var(--border-hover)}.btn-danger{background:linear-gradient(135deg, var(--danger), #dc2626);color:#fff}.btn-danger:hover{color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px #ef44444d}.btn-sm{padding:8px 16px;font-size:.85rem}.btn-full{width:100%}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none!important}.auth-footer{text-align:center;color:var(--text-secondary);margin-top:24px;font-size:.9rem}.auth-footer a{font-weight:600}.auth-error{color:var(--danger);border-radius:var(--radius-sm);text-align:center;background:#ef44441a;border:1px solid #ef44444d;margin-bottom:20px;padding:12px 16px;font-size:.85rem}.btn-google{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;width:100%;transition:var(--transition);color:var(--text-primary);box-shadow:var(--shadow-sm);background:#fff;justify-content:center;align-items:center;gap:10px;padding:12px 24px;font-family:inherit;font-size:.95rem;font-weight:600;display:inline-flex}.btn-google:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md);background:#f8f9fa;transform:translateY(-1px)}.btn-google:disabled{opacity:.6;cursor:not-allowed;transform:none!important}.auth-divider{color:var(--text-muted);align-items:center;gap:16px;margin:24px 0;font-size:.85rem;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--border);flex:1;height:1px}.auth-page{min-height:100vh;display:flex}.auth-page-bg{background:url(/images/login.webp) 50%/cover no-repeat;flex:1;position:relative}.auth-form-panel{background:#fff;flex-direction:column;justify-content:center;width:480px;min-height:100vh;padding:48px 44px;display:flex;position:relative;overflow-y:auto;box-shadow:-4px 0 30px #0000000f}.auth-topbar{text-align:center;margin-bottom:28px}.auth-topbar-brand{color:var(--text-primary);transition:var(--transition);flex-direction:column;align-items:center;gap:6px;width:100%;font-size:1.8rem;font-weight:700;text-decoration:none;display:flex}.auth-topbar-brand:hover{opacity:.7;color:var(--text-primary)}.auth-topbar-logo{object-fit:contain;border-radius:16px;width:80px;height:80px}.auth-form-card{width:100%;max-width:380px}.auth-form-title{color:var(--text-primary);margin-bottom:4px;font-size:1.5rem;font-weight:700}.auth-form-subtitle{color:var(--text-secondary);margin-bottom:24px;font-size:.88rem;line-height:1.5}.auth-page .form-group input{background:var(--bg-tertiary);border:1px solid var(--border)}.auth-page .form-group input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow);background:#fff}.auth-page .form-group label{color:var(--text-secondary);font-weight:600}.auth-page .btn-google{border:1px solid var(--border);background:#fff}.auth-page .btn-google:hover{background:var(--bg-tertiary)}.auth-page .auth-divider:before,.auth-page .auth-divider:after{background:var(--border)}.auth-page .auth-footer a{color:var(--primary);font-weight:600}.auth-page .auth-footer a:hover{color:var(--primary-dark)}@media (max-width:768px){.auth-page{flex-direction:column}.auth-page-bg{flex:none;height:200px;min-height:200px}.auth-form-panel{width:100%;min-height:auto;padding:32px 24px 48px;box-shadow:0 -4px 20px #0000000f}.auth-topbar{padding:0 0 20px;position:relative}.auth-form-card{max-width:100%}}.login-success-msg{color:var(--success);border-radius:var(--radius-sm);text-align:center;background:#4cdf6b1a;border:1px solid #4cdf6b4d;margin-bottom:20px;padding:12px 16px;font-size:.85rem}.password-rules{flex-direction:column;gap:4px;margin:10px 0 0;padding:0;list-style:none;display:flex}.password-rules li{transition:var(--transition);align-items:center;gap:8px;font-size:.8rem;display:flex}.password-rules .rule-icon{text-align:center;flex-shrink:0;width:16px;font-weight:700}.password-rules .rule-pass{color:var(--success)}.password-rules .rule-fail{color:var(--text-muted)}.dashboard-layout{min-height:100vh}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border);z-index:100;width:260px;transition:var(--transition-slow);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0;box-shadow:2px 0 20px #001e500a}.sidebar-header{border-bottom:1px solid var(--border);padding:24px 20px}.sidebar-logo{align-items:center;gap:10px;display:flex}.sidebar-logo-img{object-fit:contain;border-radius:8px;width:36px;height:36px}.sidebar-header h1{color:var(--primary);font-size:1.5rem;font-weight:800}.sidebar-header p{color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;margin-top:2px;font-size:.75rem}.sidebar-nav{flex-direction:column;flex:1;gap:4px;padding:16px 12px;display:flex}.sidebar-nav a,.sidebar-nav button{border-radius:var(--radius-sm);color:var(--text-secondary);transition:var(--transition);cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:12px;width:100%;padding:12px 16px;font-family:inherit;font-size:.9rem;font-weight:500;text-decoration:none;display:flex}.sidebar-nav a:hover,.sidebar-nav button:hover{background:var(--bg-tertiary);color:var(--text-primary)}.sidebar-nav a.active{background:var(--primary-100);color:var(--primary);border-left:3px solid var(--primary);padding-left:13px;font-weight:600}.sidebar-nav .nav-icon{text-align:center;width:24px;font-size:1.2rem}.sidebar-user{border-top:1px solid var(--border);align-items:center;gap:12px;padding:16px 20px;display:flex}.sidebar-user-avatar{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:.85rem;font-weight:700;display:flex}.sidebar-user-info{flex:1;overflow:hidden}.sidebar-user-info .name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:.85rem;font-weight:600;overflow:hidden}.sidebar-user-info .email{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:.75rem;overflow:hidden}.main-content{min-width:0;min-height:100vh;margin-left:260px;padding:32px}.page-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:32px;display:flex}.page-header h2{color:var(--text-primary);font-size:1.8rem;font-weight:700}.page-header p{color:var(--text-secondary);margin-top:4px;font-size:.9rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);transition:var(--transition);box-shadow:var(--shadow-card);padding:24px}.card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md)}.card-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.stats-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-bottom:32px;display:grid}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);transition:var(--transition);box-shadow:var(--shadow-card);padding:24px 26px;animation:.4s both fadeInUp;position:relative;overflow:hidden}.stat-card:first-child{animation-delay:0s}.stat-card:nth-child(2){animation-delay:60ms}.stat-card:nth-child(3){animation-delay:.12s}.stat-card:nth-child(4){animation-delay:.18s}.stat-card:before{content:"";border-radius:4px 4px 0 0;height:4px;position:absolute;top:0;left:0;right:0}.stat-card.income:before{background:linear-gradient(90deg, var(--primary), var(--primary-light))}.stat-card.expense:before{background:linear-gradient(90deg, var(--danger), #f87171)}.stat-card.balance:before{background:linear-gradient(90deg, var(--secondary), var(--secondary-light))}.stat-card.students:before{background:linear-gradient(90deg, var(--accent), #fbbf24)}.stat-card:hover{box-shadow:var(--shadow-glow);transform:translateY(-3px)}.stat-card.income:hover{box-shadow:0 4px 20px #0052ff24}.stat-card.expense:hover{box-shadow:0 4px 20px #ef444424}.stat-card.balance:hover{box-shadow:0 4px 20px #20840024}.stat-card.students:hover{box-shadow:0 4px 20px #14b8a624}.stat-card .stat-icon{margin-bottom:10px;font-size:1.5rem;display:block}.stat-card .stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.6px;margin-bottom:6px;font-size:.78rem;font-weight:600}.stat-card .stat-value{color:var(--text-primary);letter-spacing:-.5px;font-size:1.9rem;font-weight:800}.stat-card .stat-value.income-value{color:var(--primary)}.stat-card .stat-value.expense-value{color:var(--danger)}.stat-card .stat-value.balance-value{color:var(--secondary)}.table-container{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-card);box-shadow:var(--shadow-card);overflow-x:auto}table{border-collapse:collapse;width:100%}thead{background:var(--bg-tertiary)}th{text-align:left;color:var(--text-muted);text-transform:uppercase;letter-spacing:.6px;border-bottom:2px solid var(--border);padding:14px 18px;font-size:.78rem;font-weight:600}td{color:var(--text-primary);border-bottom:1px solid #1e3c6e0f;padding:14px 18px;font-size:.9rem}tr:last-child td{border-bottom:none}tr:hover td{background:var(--primary-50)}.badge{letter-spacing:.3px;border-radius:100px;align-items:center;gap:4px;padding:5px 12px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-success{color:var(--success);background:#22c55e1f;border:1px solid #22c55e26}.badge-danger{color:var(--danger);background:#ef44441a;border:1px solid #ef444426}.badge-warning{color:var(--warning);background:#f59e0b1a;border:1px solid #f59e0b26}.badge-info{color:var(--secondary-light);background:#6366f11a;border:1px solid #6366f126}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#0009;justify-content:center;align-items:center;padding:20px;animation:.2s fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;width:100%;max-width:500px;max-height:90vh;animation:.25s cubic-bezier(.16,1,.3,1) slideUp;overflow-y:auto;box-shadow:0 16px 48px #0000001f,0 4px 16px #0000000f}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:20px 24px;display:flex}.modal-header h3{font-size:1.1rem;font-weight:600}.modal-close{background:var(--bg-tertiary);width:32px;height:32px;color:var(--text-secondary);cursor:pointer;transition:var(--transition);border:none;border-radius:50%;justify-content:center;align-items:center;font-size:1.2rem;display:flex}.modal-close:hover{background:var(--danger);color:#fff}.modal-body{padding:24px}.modal-footer{border-top:1px solid var(--border);justify-content:flex-end;gap:12px;padding:16px 24px;display:flex}.payment-matrix{overflow-x:auto}.payment-matrix table{min-width:600px}.payment-matrix th{text-align:center;padding:10px 12px;font-size:.75rem}.payment-matrix th:first-child{text-align:left;min-width:180px}.payment-matrix td{text-align:center;padding:8px 12px}.payment-matrix td:first-child{text-align:left;font-weight:500}.payment-cell{flex-direction:column;align-items:center;gap:4px;display:flex}.payment-btn{border:2px solid var(--border);cursor:pointer;width:36px;height:36px;transition:var(--transition);background:0 0;border-radius:50%;justify-content:center;align-items:center;font-size:1rem;display:flex}.payment-btn.paid{background:var(--primary);border-color:var(--primary);color:#fff}.payment-btn:hover{border-color:var(--primary);transform:scale(1.1)}.empty-state{text-align:center;color:var(--text-muted);padding:60px 20px;animation:.4s both fadeInUp}.empty-state .empty-icon{margin-bottom:16px;font-size:3.5rem;animation:2s ease-in-out infinite gentle-bounce;display:inline-block}@keyframes gentle-bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.empty-state h3{color:var(--text-secondary);margin-bottom:8px;font-size:1.1rem}.empty-state p{max-width:320px;margin-bottom:24px;margin-left:auto;margin-right:auto;font-size:.9rem}.image-upload{border:2px dashed var(--border);border-radius:var(--radius-sm);text-align:center;cursor:pointer;transition:var(--transition);padding:20px;position:relative}.image-upload:hover{border-color:var(--primary);background:var(--primary-glow)}.image-upload input[type=file]{opacity:0;cursor:pointer;width:100%;height:100%;position:absolute;top:0;left:0}.image-upload .upload-icon{color:var(--text-muted);margin-bottom:8px;font-size:2rem}.image-upload .upload-text{color:var(--text-secondary);font-size:.85rem}.image-preview{border-radius:var(--radius-sm);margin-top:12px;position:relative;overflow:hidden}.image-preview img{object-fit:cover;border-radius:var(--radius-sm);width:100%;max-height:200px}.image-preview .remove-image{background:var(--danger);color:#fff;cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;font-size:.85rem;display:flex;position:absolute;top:8px;right:8px}.spinner{border:2px solid var(--border);border-top:2px solid var(--primary);border-radius:50%;width:20px;height:20px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-page{min-height:400px;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.actions-bar{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.toast-container{z-index:2000;flex-direction:column;gap:8px;display:flex;position:fixed;top:20px;right:20px}.toast{border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);min-width:280px;padding:14px 20px;font-size:.9rem;font-weight:500;animation:.3s slideIn,.3s 2.7s forwards fadeOut}.toast-success{background:var(--primary-dark);color:#fff;border-left:4px solid var(--primary-light)}.toast-error{color:#fff;border-left:4px solid var(--danger);background:#991b1b}@keyframes slideIn{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}.mobile-menu-btn{z-index:200;border-radius:var(--radius-sm);background:var(--bg-secondary);border:1px solid var(--border);width:44px;height:44px;color:var(--text-primary);cursor:pointer;justify-content:center;align-items:center;font-size:1.4rem;display:none;position:fixed;top:16px;left:16px}@media (max-width:768px){.mobile-menu-btn{display:flex}.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0;padding:72px 16px 24px}.page-header h2{font-size:1.4rem}.stats-grid{grid-template-columns:1fr 1fr}.card-grid{grid-template-columns:1fr}.modal{margin:16px}}@media (max-width:480px){.stats-grid{grid-template-columns:1fr}}.classroom-card{cursor:pointer;position:relative}.classroom-card:hover{box-shadow:var(--shadow-glow);border-color:var(--primary);transform:translateY(-2px)}.classroom-card .card-header{justify-content:space-between;align-items:flex-start;margin-bottom:16px;display:flex}.classroom-card .card-icon{border-radius:var(--radius-sm);background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;justify-content:center;align-items:center;width:48px;height:48px;font-size:1.4rem;display:flex}.classroom-card .card-actions{gap:4px;display:flex}.classroom-card .card-action-btn{width:32px;height:32px;color:var(--text-muted);cursor:pointer;transition:var(--transition);background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;display:flex}.classroom-card .card-action-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.classroom-card .card-action-btn.delete:hover{color:var(--danger);background:#ef444426}.classroom-card h3{margin-bottom:4px;font-size:1.1rem;font-weight:600}.classroom-card .card-meta{color:var(--text-muted);flex-direction:column;gap:4px;font-size:.85rem;display:flex}.classroom-card .card-stats{border-top:1px solid var(--border);gap:16px;margin-top:16px;padding-top:16px;display:flex}.classroom-card .card-stat{color:var(--text-secondary);font-size:.8rem}.classroom-card .card-stat strong{color:var(--text-primary);font-weight:600}.classroom-hero{border:1px solid var(--border);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:linear-gradient(135deg,#10b98114 0%,#6366f10f 100%);margin-bottom:24px;padding:28px 32px;position:relative;overflow:hidden}.classroom-hero:before{content:"";pointer-events:none;background:radial-gradient(circle,#10b9811a 0%,#0000 70%);width:200px;height:200px;position:absolute;top:-40px;right:-40px}.classroom-hero-top{align-items:center;gap:20px;margin-bottom:24px;display:flex}.btn-back{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);transition:var(--transition);white-space:nowrap;flex-shrink:0;align-items:center;gap:6px;padding:8px 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