:root{--primary-color:#6A1B9A;--secondary-color:#00BCD4;--accent-color:#CDDC39;--background-color:#F5F5F5;--text-color:#212121;--white:#FFFFFF;--light-gray:#F9F9F9;--medium-gray:#E0E0E0;--dark-gray:#757575;--success-color:#4CAF50;--warning-color:#FF9800;--error-color:#F44336;--shadow:0 2px 8px rgba(0, 0, 0, 0.1);--shadow-hover:0 4px 16px rgba(0, 0, 0, 0.15);--border-radius:8px;--transition:all 0.3s ease}[data-theme="dark"]{--background-color:#121212;--text-color:#E0E0E0;--white:#1E1E1E;--light-gray:#2D2D2D;--medium-gray:#404040;--dark-gray:#B0B0B0;--shadow:0 2px 8px rgba(0, 0, 0, 0.3);--shadow-hover:0 4px 16px rgba(0, 0, 0, 0.4)}:root{--text-size-multiplier:1}[data-text-size="small"]{--text-size-multiplier:0.875}[data-text-size="medium"]{--text-size-multiplier:1}[data-text-size="large"]{--text-size-multiplier:1.125}:root{--footer-h:64px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe 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var(--medium-gray);border-radius:var(--border-radius);box-shadow:var(--shadow);min-width:160px;opacity:0;visibility:hidden;transform:translateY(-10px);transition:var(--transition);z-index:1000}.profile-section:hover .profile-dropdown{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-item{padding:12px 16px;cursor:pointer;transition:var(--transition);font-size:calc(14px * var(--text-size-multiplier))}.dropdown-item:hover{background:var(--light-gray)}.sidebar{grid-area:sidebar;background:var(--white);border-right:1px solid var(--medium-gray);padding:24px 0;box-shadow:var(--shadow)}.nav-menu{display:flex;flex-direction:column;gap:4px}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 24px;cursor:pointer;transition:var(--transition);color:var(--text-color);font-size:calc(14px * var(--text-size-multiplier));font-weight:500}.nav-item:hover{background:var(--light-gray)}.nav-item.active{background:var(--primary-color);color:var(--white)}.nav-item 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var(--medium-gray);border-radius:var(--border-radius);cursor:pointer;transition:var(--transition);text-decoration:none;color:var(--text-color)}.quick-action-btn:hover{background:var(--primary-color);color:var(--white);border-color:var(--primary-color);transform:translateY(-2px)}.quick-action-btn .material-symbols-outlined{font-size:32px}.form-container{background:var(--white);padding:32px;border-radius:var(--border-radius);box-shadow:var(--shadow)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}.form-group{display:flex;flex-direction:column}.form-group.full-width{grid-column:1 / -1}.form-group label{font-weight:500;margin-bottom:8px;color:var(--text-color);font-size:calc(14px * var(--text-size-multiplier))}.form-group input,.form-group select,.form-group textarea{padding:12px;border:2px solid var(--medium-gray);border-radius:var(--border-radius);font-size:calc(14px * 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.1);color:var(--error-color)}.tabs-container{background:var(--white);border-radius:var(--border-radius);box-shadow:var(--shadow);overflow:hidden}.tabs{display:flex;border-bottom:1px solid var(--medium-gray)}.tab-button{padding:16px 24px;border:none;background:none;cursor:pointer;font-size:calc(14px * var(--text-size-multiplier));font-weight:500;color:var(--dark-gray);transition:var(--transition)}.tab-button.active{color:var(--primary-color);border-bottom:3px solid var(--primary-color)}.tab-content{display:none;padding:24px}.tab-content.active{display:block}.tab-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.attendance-container{background:var(--white);padding:24px;border-radius:var(--border-radius);box-shadow:var(--shadow)}.attendance-filters{display:flex;gap:16px;margin-bottom:24px}.attendance-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.attendance-card{background:var(--light-gray);padding:16px;border-radius:var(--border-radius);border:2px solid var(--medium-gray);transition:var(--transition)}.attendance-card:hover{border-color:var(--primary-color)}.student-info h4{margin-bottom:4px}.student-info p{margin:2px 0;font-size:calc(12px * var(--text-size-multiplier));color:var(--dark-gray)}.attendance-controls{margin-top:12px}.attendance-toggle{display:flex;align-items:center;gap:12px;cursor:pointer}.attendance-toggle 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ease}.modal.active{display:flex;align-items:center;justify-content:center}.modal-content{background:var(--white);border-radius:var(--border-radius);max-width:500px;width:90%;max-height:90vh;overflow-y:auto;animation:slideUp 0.3s ease}@keyframes slideUp{from{transform:translateY(50px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:24px;border-bottom:1px solid var(--medium-gray)}.modal-header h2{margin:0;color:var(--text-color)}.close{font-size:24px;cursor:pointer;color:var(--dark-gray);transition:var(--transition)}.close:hover{color:var(--error-color)}.modal-body{padding:24px}.modal-footer{display:flex;justify-content:flex-end;gap:12px;padding:24px;border-top:1px solid var(--medium-gray)}.schedule-info{color:var(--text-color)}.schedule-item{padding:8px 0;border-bottom:1px solid var(--medium-gray);margin-bottom:8px}.schedule-item:last-child{border-bottom:none;margin-bottom:0}@media (max-width:768px){.app-container{grid-template-columns:1fr;grid-template-areas:"header" "main"}.sidebar{position:fixed;top:64px;left:-240px;height:calc(100vh - 64px);transition:var(--transition);z-index:99}.sidebar.active{left:0}.form-row{grid-template-columns:1fr}.stats-grid{grid-template-columns:1fr}.reports-grid{grid-template-columns:1fr}.attendance-grid{grid-template-columns:1fr}.section-header{flex-direction:column;gap:16px;align-items:flex-start}.section-actions{width:100%;flex-wrap:wrap}.search-container input{width:100%}.setting-item{flex-direction:column;align-items:flex-start}.setting-item label{min-width:auto}.profile-info{display:none}.attendance-filters{flex-direction:column}.quick-actions{grid-template-columns:1fr}}@media (max-width:480px){.main-content{padding:16px}.form-container{padding:16px}.modal-content{width:95%;margin:16px}.modal-header,.modal-body,.modal-footer{padding:16px}.attendance-card{padding:12px}.dashboard-section{padding:16px}}.text-center{text-align:center}.text-right{text-align:right}.text-error{color:var(--error-color);font-weight:600}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.hidden{display:none}.visible{display:block}.loading{display:flex;justify-content:center;align-items:center;height:200px}.spinner{border:4px solid var(--medium-gray);border-top:4px solid var(--primary-color);border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.hamburger{background:none;border:none;cursor:pointer;font-size:28px;display:none}@media (max-width:768px){.hamburger{display:block;margin-right:12px}}@media (max-width:768px){.table-container{overflow-x:auto;width:100%}table{min-width:768px}}@media (max-width:768px){.app-title{font-size:18px}}@media (max-width:480px){.app-title{font-size:16px}}.logo-icon{font-size:24px}.logout-btn{padding:.5rem 1rem;border:1px solid #f55;border-radius:.375rem;background:#fff0;color:#f55;font-weight:600;transition:background 0.15s}.logout-btn:hover{background:#f55;color:#fff}footer{background-color:#00539C;color:#fff;text-align:center;padding:1rem;position:fixed;bottom:0;width:100%;font-size:.9rem;height:var(--footer-h)}footer a{color:#fff;text-decoration:none;margin:0 10px}footer a:hover{text-decoration:underline}@media (max-width:600px){main{padding:1rem}footer{font-size:.8rem}};