:root{--color-primary: #1e194f;--color-secondary: #9fcc3b;--color-accent-yellow: #f6b918;--color-accent-red: #eb1d25;--color-accent-teal: #00b1bc;--color-white: #ffffff;--color-gray-50: #f8fafc;--color-gray-100: #f1f5f9;--color-gray-200: #e2e8f0;--color-gray-300: #cbd5e1;--color-gray-400: #94a3b8;--color-gray-500: #64748b;--color-gray-600: #475569;--color-gray-700: #334155;--color-gray-800: #1e293b;--color-gray-900: #0f172a;--color-success: #10b981;--color-warning: #f59e0b;--color-error: #ef4444;--color-info: #3b82f6;--font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--transition-fast: .15s ease-in-out;--transition-base: .2s ease-in-out;--transition-slow: .3s ease-in-out}*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-synthesis:none;text-rendering:optimizeLegibility}body{margin:0;padding:0;font-family:var(--font-family-base);color:var(--color-gray-900);background-color:var(--color-gray-50);min-width:320px;min-height:100vh}.text-primary{color:var(--color-primary)}.text-secondary{color:var(--color-secondary)}.text-white{color:var(--color-white)}.text-gray-400{color:var(--color-gray-400)}.text-gray-500{color:var(--color-gray-500)}.text-gray-600{color:var(--color-gray-600)}.text-gray-700{color:var(--color-gray-700)}.text-warning{color:#92400e}.text-error{color:var(--color-error)}.text-success{color:var(--color-success)}.bg-primary{background-color:var(--color-primary)}.bg-secondary{background-color:var(--color-secondary)}.bg-white{background-color:var(--color-white)}.bg-gray-50{background-color:var(--color-gray-50)}.bg-gray-100{background-color:var(--color-gray-100)}.text-xs{font-size:var(--font-size-xs)}.text-sm{font-size:var(--font-size-sm)}.text-base{font-size:var(--font-size-base)}.text-lg{font-size:var(--font-size-lg)}.text-xl{font-size:var(--font-size-xl)}.text-2xl{font-size:var(--font-size-2xl)}.text-3xl{font-size:var(--font-size-3xl)}.font-normal{font-weight:400}.font-medium{font-weight:500}.font-semibold{font-weight:600}.font-bold{font-weight:700}.container{max-width:1280px;margin:0 auto;padding:0 var(--space-4)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:var(--space-2)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.text-center{text-align:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);border:none;border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:500;line-height:1;text-decoration:none;cursor:pointer;transition:all var(--transition-base);white-space:nowrap;font-family:inherit}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background-color:var(--color-secondary);color:var(--color-primary)}.btn-primary:hover:not(:disabled){background-color:#8db332;transform:translateY(-1px)}.btn-secondary{background-color:transparent;color:var(--color-primary);border:2px solid var(--color-primary)}.btn-secondary:hover:not(:disabled){background-color:var(--color-primary);color:var(--color-white)}.btn-success{background-color:var(--color-success);color:var(--color-white)}.btn-success:hover:not(:disabled){background-color:#059669}.btn-error{background-color:var(--color-error);color:var(--color-white)}.btn-error:hover:not(:disabled){background-color:#dc2626}.btn-yellow{background-color:var(--color-accent-yellow);color:var(--color-white)}.btn-yellow:hover:not(:disabled){background-color:#d97706}.btn-teal{background-color:var(--color-accent-teal);color:var(--color-white)}.btn-teal:hover:not(:disabled){background-color:#0891b2}.btn-outline{background-color:transparent;color:var(--color-gray-600);border:1px solid var(--color-gray-300)}.btn-outline:hover:not(:disabled){background-color:var(--color-gray-50)}.btn-sm{padding:var(--space-2) var(--space-3);font-size:var(--font-size-xs)}.btn-lg{padding:var(--space-4) var(--space-6);font-size:var(--font-size-base)}.btn-full-width{width:100%;justify-content:center}.btn-link{background:none;border:none;cursor:pointer;font-size:var(--font-size-sm);font-weight:500;text-decoration:none}.btn-link:hover{text-decoration:underline}.card{background-color:var(--color-white);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--color-gray-200);overflow:hidden;transition:all var(--transition-base)}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.card-body{padding:var(--space-6)}.card-header{padding:var(--space-4) var(--space-6);border-bottom:1px solid var(--color-gray-200);background-color:var(--color-gray-50)}.form-group{margin-bottom:var(--space-5)}.form-label{display:block;margin-bottom:var(--space-2);font-size:var(--font-size-sm);font-weight:500;color:var(--color-gray-700)}.form-input{width:100%;padding:var(--space-3);border:1px solid var(--color-gray-300);border-radius:var(--radius-md);font-size:var(--font-size-sm);transition:border-color var(--transition-base);font-family:inherit}.form-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #1e194f1a}.form-textarea{resize:vertical;min-height:80px;font-family:inherit}.form-select{background-color:var(--color-white);cursor:pointer}.form-actions{display:flex;gap:var(--space-4);justify-content:flex-end;margin-top:var(--space-8)}.header{background-color:var(--color-accent-teal);border-bottom:4px solid var(--color-secondary);width:100%;position:relative}.header-container{padding:0 var(--space-4);display:flex;align-items:center;height:4rem;width:100%;padding-right:10rem}.header-content{display:flex;align-items:center;min-width:0;flex:1;overflow:hidden}.header-logo{height:2rem;margin-right:var(--space-3);flex-shrink:0}.header-logo-fallback{display:none;color:var(--color-white);font-size:var(--font-size-xl);font-weight:700}.header-title{font-size:var(--font-size-base);font-weight:600;color:var(--color-white);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-right:var(--space-4)}.header-signout{position:absolute;top:50%;right:var(--space-4);transform:translateY(-50%);padding:var(--space-2) var(--space-4);font-size:var(--font-size-sm);border:2px solid var(--color-white);border-radius:var(--radius-md);color:var(--color-white);background:transparent;cursor:pointer;font-weight:500;white-space:nowrap;z-index:100;transition:all var(--transition-base);font-family:inherit}.status-badge{padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:500;display:inline-flex;align-items:center;gap:var(--space-1)}.status-ready{background-color:#f0f9ff;color:var(--color-secondary)}.status-process{background-color:#fffbeb;color:var(--color-accent-yellow)}.status-complete{background-color:#ecfdf5;color:var(--color-success)}.status-overdue{background-color:var(--color-error);color:var(--color-white)}.status-success,.status-active{background-color:var(--color-success);color:var(--color-white)}.status-inactive{background-color:var(--color-gray-500);color:var(--color-white)}.grid{display:grid;gap:var(--space-6)}.grid-auto-fill{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.app-container{min-height:100vh;background:var(--color-gray-50);font-family:var(--font-family-base);width:100vw}.main-content{width:100%;min-height:calc(100vh - 4rem);padding:clamp(1rem,3vw,2rem)}.page-header{margin-bottom:var(--space-8)}.page-title{font-size:var(--font-size-3xl);font-weight:700;color:var(--color-primary);margin:0 0 var(--space-2) 0}.page-subtitle{color:var(--color-gray-500);margin:0}.back-btn{display:inline-block;margin-bottom:var(--space-4)}.section-header{font-size:var(--font-size-xl);font-weight:600;color:var(--color-primary);margin:0 0 var(--space-4) 0;display:flex;align-items:center;gap:var(--space-2)}.login-container{min-height:100vh;width:100vw;background:linear-gradient(135deg,var(--color-gray-50) 0%,var(--color-gray-200) 100%);display:flex;align-items:center;justify-content:center;padding:var(--space-4);font-family:var(--font-family-base);box-sizing:border-box}.login-card{width:100%;max-width:min(90vw,700px);background:var(--color-white);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);padding:clamp(1.5rem,4vw,3rem);text-align:center}.login-header{margin-bottom:var(--space-8)}.login-logo{width:clamp(200px,35vw,300px);height:auto;margin:0 auto var(--space-6);display:block}.login-logo-fallback{display:none;font-size:clamp(1.75rem,5vw,2.5rem);font-weight:700;color:var(--color-primary);margin-bottom:var(--space-6)}.login-title{font-size:clamp(1.5rem,3.5vw,2rem);font-weight:700;color:var(--color-primary);margin-bottom:var(--space-3);line-height:1.2}.login-subtitle{color:var(--color-gray-500);font-size:clamp(.875rem,1.8vw,1rem);margin-bottom:var(--space-6);line-height:1.5}.login-buttons{display:flex;gap:var(--space-3);margin-bottom:var(--space-6)}.login-btn{flex:1;padding:.875rem 1.25rem;border-radius:3rem;font-weight:600;font-size:var(--font-size-base);transition:all var(--transition-base)}.login-divider{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-6)}.login-divider-line{flex:1;height:1px;background-color:var(--color-gray-200)}.login-divider-text{color:var(--color-gray-500);font-size:var(--font-size-sm)}.google-signin-btn{width:100%;padding:.875rem;border-radius:var(--radius-lg);font-weight:500;font-size:var(--font-size-sm);display:flex;align-items:center;justify-content:center;gap:.6rem;transition:all var(--transition-base)}.login-terms{font-size:var(--font-size-xs);color:var(--color-gray-500);text-align:center;margin-top:var(--space-4)}.feature-grid{display:grid;gap:var(--space-4);margin-bottom:var(--space-8)}.feature-grid-2x2{grid-template-columns:repeat(2,1fr)}.feature-grid-4x1{grid-template-columns:repeat(4,1fr)}.feature-grid-1x4{grid-template-columns:1fr}.feature-card{text-align:center;padding:var(--space-4) var(--space-3);background:var(--color-gray-100);border-radius:var(--radius-lg);border:2px solid var(--color-gray-200);transition:all var(--transition-base)}.feature-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.feature-icon{margin:0 auto var(--space-3)}.feature-text{font-size:var(--font-size-base);color:var(--color-gray-700);font-weight:600;margin:0}.teacher-actions{display:flex;gap:var(--space-4);margin-bottom:var(--space-8);flex-wrap:wrap}.dashboard-section{margin-bottom:var(--space-12)}.class-card{transition:all var(--transition-base)}.class-card:hover{transform:translateY(-2px)}.class-title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-primary);margin-bottom:var(--space-2);line-height:1.3}.class-settings-btn{color:var(--color-gray-500);background:none;border:none;cursor:pointer;padding:var(--space-1);border-radius:var(--radius-sm);transition:all var(--transition-base)}.class-settings-btn:hover{background-color:var(--color-gray-100)}.class-description{font-size:var(--font-size-sm);color:var(--color-gray-500);margin-bottom:var(--space-4);line-height:1.5}.class-stats{display:flex;justify-content:space-between;margin-bottom:var(--space-4)}.class-stat{display:flex;align-items:center;gap:var(--space-2);font-size:var(--font-size-sm);color:var(--color-gray-500)}.class-actions{display:flex;gap:var(--space-2)}.assignment-card{transition:all var(--transition-base)}.assignment-card:hover{transform:translateY(-2px)}.assignment-title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-primary);margin-bottom:var(--space-2)}.assignment-description{font-size:var(--font-size-sm);color:var(--color-gray-500);margin-bottom:var(--space-4);line-height:1.5}.assignment-meta{display:flex;justify-content:space-between;margin-bottom:var(--space-4);font-size:var(--font-size-sm);color:var(--color-gray-500)}.assignment-actions{display:flex;gap:var(--space-2)}.task-card{padding:var(--space-4);border-left:4px solid var(--color-secondary);transition:all var(--transition-base)}.task-card:hover{transform:translateY(-1px)}.task-overdue{border-left-color:var(--color-error);background-color:#fef2f2}.task-completed{border-left-color:var(--color-success);background-color:#f0fdf4}.task-pending{border-left-color:var(--color-secondary)}.task-list{display:flex;flex-direction:column;gap:var(--space-4)}.empty-state{padding:var(--space-8) var(--space-6);text-align:center;background-color:var(--color-white);border-radius:var(--radius-lg);border:2px dashed var(--color-gray-200)}.empty-state-title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-gray-500);margin-bottom:var(--space-2)}.empty-state-text{color:var(--color-gray-400);margin-bottom:var(--space-6)}.notification-badge{background-color:var(--color-error);color:var(--color-white);font-size:var(--font-size-xs);font-weight:600;width:1.25rem;height:1.25rem;border-radius:50%;display:flex;align-items:center;justify-content:center}.loading-screen{min-height:100vh;background:linear-gradient(135deg,#f0f4ff,#e6f2ff);display:flex;align-items:center;justify-content:center;font-family:var(--font-family-base)}.loading-content{text-align:center}.loading-spinner{width:4rem;height:4rem;border:4px solid var(--color-secondary);border-top:4px solid transparent;border-radius:50%;margin:0 auto var(--space-4)}@media (max-width: 768px){.header-container{padding-right:6rem}.header-signout{right:var(--space-2);padding:.4rem var(--space-3);font-size:var(--font-size-xs)}.header-title{font-size:var(--font-size-sm)}.header-logo{height:1.5rem;margin-right:var(--space-2)}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.teacher-actions,.login-buttons,.class-actions,.assignment-actions{flex-direction:column}.form-actions{flex-direction:column-reverse}.class-stats,.assignment-meta{flex-direction:column;gap:var(--space-2)}.feature-grid-4x1,.feature-grid-2x2{grid-template-columns:repeat(2,1fr)}}@media (max-width: 480px){.header-container{padding-left:var(--space-2);padding-right:5.5rem}.container{padding:0 var(--space-2)}.main-content{padding:var(--space-4)}.page-title{font-size:var(--font-size-2xl)}.feature-grid-4x1,.feature-grid-2x2{grid-template-columns:1fr}}@keyframes spin{to{transform:rotate(360deg)}}.animate-spin{animation:spin 1s linear infinite}.header{background-color:var(--color-accent-teal);border-bottom:4px solid var(--color-secondary);width:100%;position:relative;min-height:5rem;display:flex;align-items:center}.header-container{padding:0 var(--space-4);display:flex;align-items:center;justify-content:center;height:5rem;width:100%;position:relative}.header-logo{height:4rem;width:auto;max-width:300px;margin:0;flex-shrink:0;z-index:10}.header-logo-fallback{display:none;color:var(--color-white);font-size:2.5rem;font-weight:700;text-align:center}.header-content{position:absolute;left:var(--space-4);top:50%;transform:translateY(-50%);display:flex;align-items:center;gap:var(--space-4);min-width:0;overflow:hidden;max-width:calc(50% - 150px)}.header-title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-white);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-user{font-size:var(--font-size-sm);color:var(--color-white);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-actions{position:absolute;right:var(--space-4);top:50%;transform:translateY(-50%);display:flex;align-items:center;gap:var(--space-3)}.header-signout{position:static;transform:none;padding:var(--space-2) var(--space-4);font-size:var(--font-size-sm);border:2px solid var(--color-white);border-radius:var(--radius-md);color:var(--color-white);background:transparent;cursor:pointer;font-weight:500;white-space:nowrap;transition:all var(--transition-base);font-family:inherit}.header-signout:hover{background-color:var(--color-white);color:var(--color-accent-teal)}.preview-mode-btn{padding:var(--space-2) var(--space-3);font-size:var(--font-size-xs);border:1px solid var(--color-white);border-radius:var(--radius-sm);color:var(--color-white);background:#ffffff1a;cursor:pointer;font-weight:500;white-space:nowrap;transition:all var(--transition-base);font-family:inherit;display:flex;align-items:center;gap:var(--space-2)}.preview-mode-btn:hover{background-color:#fff3}.page-header-with-actions{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--space-8);flex-wrap:wrap;gap:var(--space-4)}.page-header-content{flex:1;min-width:300px}.page-header-actions{display:flex;gap:var(--space-3);flex-wrap:wrap;align-items:center}.teacher-actions-inline{display:flex;gap:var(--space-3);flex-wrap:wrap}.teacher-actions{display:none}.section-header{font-size:var(--font-size-xl);font-weight:600;color:var(--color-primary);margin:0 0 var(--space-6) 0;display:flex;align-items:center;gap:var(--space-2);padding-bottom:var(--space-2);border-bottom:2px solid var(--color-gray-100)}@media (max-width: 1024px){.header-container{flex-direction:column;height:auto;min-height:6rem;padding:var(--space-3) var(--space-4)}.header-content{position:static;transform:none;max-width:100%;order:2;justify-content:center;margin-top:var(--space-2)}.header-logo{height:3rem;order:1}.header-actions{position:static;transform:none;order:3;margin-top:var(--space-2)}.page-header-with-actions{flex-direction:column;align-items:stretch}.page-header-actions,.teacher-actions-inline{justify-content:center;width:100%}}@media (max-width: 768px){.header-logo{height:2.5rem}.header-title{font-size:var(--font-size-base)}.header-actions,.page-header-actions,.teacher-actions-inline{flex-direction:column;gap:var(--space-2)}}@media (max-width: 480px){.header-container{min-height:7rem}.header-logo{height:2rem}.header-content{flex-direction:column;text-align:center;gap:var(--space-1)}}.assignment-modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.assignment-modal-content{background:#fff;border-radius:.75rem;box-shadow:0 25px 50px -12px #00000040;width:100%;max-width:900px;max-height:90vh;overflow-y:auto;position:relative}.assignment-modal-header{padding:1.5rem 2rem;border-bottom:1px solid #e5e7eb;position:sticky;top:0;background:#fff;z-index:10}.assignment-modal-body{padding:2rem;min-height:500px}.assignment-modal-footer{padding:1rem 2rem;border-top:1px solid #e5e7eb;background:#f9fafb;position:sticky;bottom:0;display:flex;justify-content:flex-end;gap:1rem}@media (max-width: 768px){.assignment-modal-overlay{padding:.5rem}.assignment-modal-content{max-width:100%;max-height:95vh}.assignment-modal-header,.assignment-modal-body,.assignment-modal-footer{padding:1rem}}.modal-xl{max-width:900px!important}.modal-dialog-scrollable{max-height:90vh!important}