:root{--text-primary:#212121;--text-secondary:#555;--background-white:#fff;--background-light:#f7f8fa;--card-border:#e0e0e0;--accent-green:#33ae78;--accent-green-dark:#228b22;--accent-green-light:#eaf7f0;--accent-red:#e74c3c;--accent-yellow:#f1c40f;--accent-blue:#3498db;--accent-purple:#9b59b6;--sidebar-width:260px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);color:var(--text-primary);background-color:var(--background-light);line-height:1.6;overflow-x:hidden}a{color:var(--accent-green);text-decoration:none;transition:color .2s}a:hover{color:var(--accent-green-dark)}.container{max-width:1200px;margin:0 auto;padding:0 20px}.main-content{min-height:100vh;padding-bottom:4rem}.glass-btn{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);color:var(--text-primary);cursor:pointer;background:#fff6;border:1px solid #fff9;border-radius:12px;padding:10px 24px;font-family:inherit;font-size:.95rem;font-weight:600;transition:all .3s;display:inline-block}.glass-btn:hover{background:#fffc;transform:translateY(-2px)}.glass-btn.primary{color:#fff;background:#33ae78e6;border:1px solid #ffffff4d}.glass-btn.primary:hover{background:#33ae78}.glass-btn.danger{color:#fff;background:#e74c3ce6;border:1px solid #ffffff4d}.glass-btn.danger:hover{background:#e74c3c}.glass-btn.secondary{color:var(--text-primary);border:1px solid var(--card-border);background:#fff9}.glass-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.glass-card{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background-color:#ffffff80;border:1px solid #fffc;border-radius:16px;transition:all .3s;box-shadow:0 4px 20px #0000000d}.glass-card:hover{box-shadow:0 8px 32px #00000014}.floating-elements{z-index:-1;pointer-events:none;width:100%;height:100%;position:fixed;top:0;left:0}.floating-elements li{color:#33ae781a;font-size:2rem;list-style:none;animation:25s linear infinite floatUp;position:absolute;bottom:-150px}.floating-elements li:nth-child(2){font-size:1.5rem;animation-duration:12s;left:10%}.floating-elements li:nth-child(4){font-size:2.5rem;animation-duration:18s;left:40%}@keyframes floatUp{0%{opacity:.15;transform:translateY(0)rotate(0)}to{opacity:0;transform:translateY(-100vh)rotate(720deg)}}.input-field{border:1px solid var(--card-border);width:100%;color:var(--text-primary);background:#ffffffb3;border-radius:10px;outline:none;margin-bottom:1rem;padding:12px 16px;font-family:inherit;font-size:1rem;transition:border-color .2s,box-shadow .2s}.input-field:focus{border-color:var(--accent-green);box-shadow:0 0 0 3px #33ae7826}.form-label{color:var(--text-primary);margin-bottom:6px;font-size:.9rem;font-weight:600;display:block}.form-group{margin-bottom:1.2rem}.loading-spinner{border:3px solid #33ae7833;border-top-color:var(--accent-green);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-container{justify-content:center;align-items:center;min-height:300px;display:flex}.dashboard-wrapper{min-height:100vh;display:flex}.dashboard-sidebar{width:var(--sidebar-width);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-right:1px solid var(--card-border);z-index:200;background:#ffffffd9;flex-direction:column;height:100vh;transition:transform .3s;display:flex;position:fixed;top:0;left:0}.sidebar-brand{color:var(--accent-green-dark);border-bottom:1px solid var(--card-border);align-items:center;gap:10px;padding:24px 20px 20px;font-size:1.15rem;font-weight:700;display:flex}.sidebar-role-badge{background:var(--accent-green-light);color:var(--accent-green-dark);text-align:center;letter-spacing:.5px;text-transform:uppercase;border-radius:20px;margin:16px 20px 8px;padding:6px 14px;font-size:.8rem;font-weight:600}.sidebar-nav{flex-direction:column;flex:1;gap:4px;padding:12px;display:flex}.sidebar-link{color:var(--text-secondary);border-radius:10px;align-items:center;gap:12px;padding:12px 16px;font-size:.95rem;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.sidebar-link:hover{color:var(--accent-green-dark);background:#33ae7814}.sidebar-link.active{color:var(--accent-green-dark);background:#33ae781f;font-weight:600}.sidebar-footer{border-top:1px solid var(--card-border);padding:16px}.sidebar-user{align-items:center;gap:10px;margin-bottom:8px;padding:8px 4px;display:flex}.sidebar-avatar{background:var(--accent-green);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-size:.95rem;font-weight:700;display:flex}.sidebar-username{color:var(--text-primary);font-size:.9rem;font-weight:600}.sidebar-logout{width:100%;color:var(--accent-red);cursor:pointer;background:#e74c3c14;border:none;border-radius:10px;align-items:center;gap:10px;padding:10px 12px;font-family:inherit;font-size:.9rem;font-weight:500;transition:all .2s;display:flex}.sidebar-logout:hover{background:#e74c3c26}.sidebar-toggle{z-index:300;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid var(--card-border);cursor:pointer;color:var(--text-primary);background:#ffffffe6;border-radius:10px;padding:8px;display:none;position:fixed;top:16px;left:16px;box-shadow:0 2px 8px #00000014}.sidebar-overlay{z-index:150;background:#0000004d;display:none;position:fixed;inset:0}.dashboard-main{margin-left:var(--sidebar-width);flex:1;min-height:100vh}.dashboard-header{padding:28px 32px 0}.dashboard-title{color:var(--text-primary);letter-spacing:-.5px;font-size:1.8rem;font-weight:700}.dashboard-content{padding:24px 32px 48px}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:28px;display:grid}.stat-card{padding:20px 20px 20px 24px;position:relative;overflow:hidden}.stat-card-accent{border-radius:16px 0 0 16px;width:4px;height:100%;position:absolute;top:0;left:0}.stat-card-body{flex-direction:column;display:flex}.stat-card-value{margin-bottom:4px;font-size:2rem;font-weight:700;line-height:1.1}.stat-card-label{color:var(--text-secondary);font-size:.88rem;font-weight:500}.stat-card-sublabel{color:var(--text-secondary);opacity:.7;margin-top:2px;font-size:.78rem}.data-table-wrapper{border-radius:16px;overflow-x:auto}.data-table{border-collapse:separate;border-spacing:0;width:100%;font-size:.92rem}.data-table th{text-align:left;color:var(--text-primary);white-space:nowrap;border-bottom:1px solid var(--card-border);background:#33ae780f;padding:14px 16px;font-weight:600}.data-table td{vertical-align:middle;border-bottom:1px solid #0000000a;padding:12px 16px}.data-table tbody tr{transition:background .15s}.data-table tbody tr:hover{background:#33ae7808}.data-table tbody tr:last-child td{border-bottom:none}.badge{letter-spacing:.3px;border-radius:20px;align-items:center;padding:4px 12px;font-size:.78rem;font-weight:600;display:inline-flex}.badge-present,.badge-completed,.badge-active{color:#228b22;background:#33ae781f}.badge-absent,.badge-cancelled{color:#c0392b;background:#e74c3c1f}.badge-late,.badge-scheduled{color:#b7950b;background:#f1c40f26}.badge-pending{color:#2980b9;background:#3498db1f}.attendance-grid{flex-direction:column;gap:0;display:flex}.attendance-row{border-bottom:1px solid #0000000a;align-items:center;gap:16px;padding:12px 16px;display:flex}.attendance-row:last-child{border-bottom:none}.attendance-student-name{flex:1;font-size:.95rem;font-weight:500}.attendance-student-email{color:var(--text-secondary);font-size:.82rem}.attendance-toggle-group{gap:6px;display:flex}.attendance-toggle{border:1px solid var(--card-border);cursor:pointer;color:var(--text-secondary);background:#fff9;border-radius:8px;padding:6px 14px;font-family:inherit;font-size:.8rem;font-weight:600;transition:all .2s}.attendance-toggle.selected-present{border-color:var(--accent-green);color:#228b22;background:#33ae7826}.attendance-toggle.selected-absent{border-color:var(--accent-red);color:#c0392b;background:#e74c3c26}.attendance-toggle.selected-late{border-color:var(--accent-yellow);color:#b7950b;background:#f1c40f2e}.chart-center-label{text-align:center;pointer-events:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-55%)}.chart-percentage{color:var(--text-primary);font-size:1.8rem;font-weight:700;line-height:1;display:block}.chart-percentage-label{color:var(--text-secondary);margin-top:4px;font-size:.75rem;display:block}.section-heading{color:var(--text-primary);align-items:center;gap:8px;margin-bottom:16px;font-size:1.15rem;font-weight:600;display:flex}.class-card{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:12px;padding:16px 20px;display:flex}.class-card-info h4{color:var(--text-primary);margin-bottom:4px;font-size:1rem;font-weight:600}.class-card-info p{color:var(--text-secondary);font-size:.85rem}.class-card-meta{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.class-time{color:var(--text-secondary);border:1px solid var(--card-border);background:#fff9;border-radius:8px;padding:4px 10px;font-size:.82rem;font-weight:500}.dashboard-grid{grid-template-columns:1fr 1fr;gap:24px;margin-bottom:28px;display:grid}.dashboard-grid-3{grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:28px;display:grid}.full-width{grid-column:1/-1}.responsive-grid-2{grid-template-columns:1fr 1fr;gap:12px;display:grid}@media (max-width:600px){.responsive-grid-2{grid-template-columns:1fr}}.modal-overlay{z-index:500;background:#0006;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal-content{background:#fff;border-radius:16px;width:100%;max-width:500px;max-height:80vh;padding:32px;overflow-y:auto;box-shadow:0 16px 48px #00000026}.alert{border-radius:12px;margin-bottom:16px;padding:14px 18px;font-size:.9rem;font-weight:500}.alert-success{color:#228b22;background:#33ae781a;border:1px solid #33ae7833}.alert-error{color:#c0392b;background:#e74c3c1a;border:1px solid #e74c3c33}.alert-warning{color:#b7950b;background:#f1c40f1f;border:1px solid #f1c40f33}.alert-info{color:#2980b9;background:#3498db1a;border:1px solid #3498db33}.empty-state{text-align:center;color:var(--text-secondary);padding:48px 24px}.empty-state-icon{opacity:.3;width:64px;height:64px;margin:0 auto 16px}.empty-state h3{color:var(--text-primary);margin-bottom:8px;font-size:1.1rem}.empty-state p{font-size:.9rem}@media (max-width:768px){.dashboard-sidebar{transform:translate(-100%)}.dashboard-sidebar.open{transform:translate(0)}.sidebar-toggle{display:flex}.sidebar-overlay{display:block}.dashboard-main{margin-left:0}.dashboard-header{padding:68px 16px 0}.dashboard-content{padding:16px 16px 48px}.dashboard-grid,.dashboard-grid-3{grid-template-columns:1fr}.stats-grid{grid-template-columns:repeat(2,1fr)}.attendance-row{flex-wrap:wrap}.class-card{flex-direction:column;align-items:flex-start}.data-table-wrapper{-webkit-overflow-scrolling:touch;border-radius:12px}.data-table th,.data-table td{padding:10px 12px;font-size:.82rem}.glass-card{border-radius:12px}.glass-btn{padding:8px 16px;font-size:.85rem}.section-heading{font-size:1rem}.modal-content{border-radius:12px;max-width:100%;padding:20px}.alert{padding:10px 14px;font-size:.82rem}.stat-card{padding:16px 16px 16px 20px}.stat-card-value{font-size:1.6rem}.stat-card-label{font-size:.82rem}.input-field{padding:10px 12px;font-size:.92rem}.form-label{font-size:.82rem}.attendance-toggle{padding:5px 10px;font-size:.75rem}}@media (max-width:480px){.stats-grid{grid-template-columns:1fr}.dashboard-title{font-size:1.4rem}.dashboard-header{padding:60px 12px 0}.dashboard-content{padding:12px 12px 48px}.data-table th,.data-table td{padding:8px 10px;font-size:.78rem}.glass-btn{padding:6px 10px;font-size:.78rem}.stat-card-value{font-size:1.3rem}}.hero-section{align-items:center;min-height:85vh;padding:100px 0 80px;display:flex;position:relative;overflow:hidden}.hero-content{z-index:2;text-align:center;max-width:720px;margin:0 auto;position:relative}.hero-badge{background:var(--accent-green-light);color:var(--accent-green-dark);letter-spacing:.5px;text-transform:uppercase;border-radius:24px;margin-bottom:24px;padding:6px 18px;font-size:.82rem;font-weight:600;animation:.6s both fadeSlideUp;display:inline-block}.floating-elements{z-index:-1;pointer-events:none;width:100%;height:100%;margin:0;padding:0;position:fixed;top:0;left:0;overflow:hidden}.floating-elements li{opacity:.15;width:20px;height:20px;font-size:2rem;list-style:none;animation:25s linear infinite floatUp;display:block;position:absolute;bottom:-150px}.floating-elements li:first-child{animation-delay:0s;left:25%}.floating-elements li:nth-child(2){font-size:1.5rem;animation-duration:12s;animation-delay:2s;left:10%}.floating-elements li:nth-child(3){animation-delay:4s;left:70%}.floating-elements li:nth-child(4){font-size:2.5rem;animation-duration:18s;animation-delay:0s;left:40%}.floating-elements li:nth-child(5){animation-delay:0s;left:65%}.floating-elements li:nth-child(6){font-size:3rem;animation-duration:22s;animation-delay:3s;left:75%}.floating-elements li:nth-child(7){animation-delay:7s;left:35%}.floating-elements li:nth-child(8){font-size:1.2rem;animation-duration:45s;animation-delay:15s;left:50%}.floating-elements li:nth-child(9){animation-duration:35s;animation-delay:2s;left:20%}.floating-elements li:nth-child(10){font-size:2.8rem;animation-duration:11s;animation-delay:0s;left:85%}