.language-selector{position:relative}.language-selector-btn{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#fff;border:2px solid #e0e0e0;border-radius:8px;cursor:pointer;font-size:14px;font-weight:500;color:#333;transition:all .3s ease}.language-selector-btn:hover{border-color:#667eea;background:#f8f9ff}.language-selector-btn .flag{font-size:18px}.language-selector-btn .lang-code{font-weight:600;color:#667eea}.language-selector-btn .dropdown-arrow{font-size:10px;color:#999;transition:transform .3s ease}.language-dropdown{position:absolute;top:calc(100% + 8px);right:0;background:#fff;border:2px solid #e0e0e0;border-radius:8px;box-shadow:0 4px 12px #00000026;min-width:160px;overflow:hidden;z-index:1000;animation:slideDown .2s ease}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.language-option{display:flex;align-items:center;gap:10px;padding:12px 16px;width:100%;background:#fff;border:none;text-align:left;cursor:pointer;transition:background .2s ease;border-bottom:1px solid #f0f0f0}.language-option:last-child{border-bottom:none}.language-option:hover{background:#f8f9ff}.language-option.active{background:#e8eaff}.language-option .flag{font-size:20px}.language-option .lang-name{flex:1;font-size:14px;font-weight:500;color:#333}.language-option .checkmark{color:#667eea;font-weight:700;font-size:16px}@media (max-width: 500px){.language-selector-btn{padding:6px 10px}.language-selector-btn .flag{font-size:16px}.language-dropdown{min-width:140px}}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);position:relative;overflow:hidden}.login-background{position:absolute;top:0;left:0;right:0;bottom:0;overflow:hidden;opacity:.1}.math-symbols{position:absolute;width:100%;height:100%}.symbol{position:absolute;font-size:4rem;color:#fff;opacity:.3;animation:float 20s infinite ease-in-out}.symbol:nth-child(1){top:10%;left:10%;animation-delay:0s}.symbol:nth-child(2){top:20%;right:15%;animation-delay:2s}.symbol:nth-child(3){bottom:20%;left:20%;animation-delay:4s}.symbol:nth-child(4){top:60%;right:20%;animation-delay:6s}.symbol:nth-child(5){bottom:30%;right:10%;animation-delay:8s}.symbol:nth-child(6){top:40%;left:15%;animation-delay:10s}@keyframes float{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-20px) rotate(10deg)}}.login-card{background:#fff;border-radius:20px;padding:40px;width:100%;max-width:450px;box-shadow:0 20px 60px #0000004d;position:relative;z-index:1;margin:20px}.language-selector-wrapper{position:absolute;top:20px;right:20px}.login-header{text-align:center;margin-bottom:30px}.app-logo{font-size:60px;margin-bottom:10px}.app-title{font-size:28px;font-weight:700;color:#333;margin:0 0 8px}.app-subtitle{font-size:14px;color:#666;margin:0}.auth-toggle{display:flex;gap:10px;margin-bottom:30px;background:#f5f5f5;border-radius:10px;padding:5px}.toggle-btn{flex:1;padding:12px 20px;border:none;background:transparent;color:#666;font-weight:600;font-size:15px;border-radius:8px;cursor:pointer;transition:all .3s ease}.toggle-btn.active{background:#fff;color:#667eea;box-shadow:0 2px 8px #0000001a}.login-form,.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:500;font-size:14px;color:#333}.form-group input{width:100%;padding:12px 16px;border:2px solid #e0e0e0;border-radius:8px;font-size:15px;transition:border-color .3s ease;box-sizing:border-box}.form-group input:focus{outline:none;border-color:#667eea}.form-group input::placeholder{color:#999}.form-footer{text-align:right;margin-bottom:20px}.forgot-password{font-size:13px;color:#667eea;text-decoration:none;transition:color .3s ease}.forgot-password:hover{color:#764ba2;text-decoration:underline}.error-message{background:#ffebee;color:#c62828;padding:12px;border-radius:8px;margin-bottom:20px;font-size:14px;border-left:4px solid #c62828}.submit-btn{width:100%;padding:14px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease}.submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 15px #667eea66}.submit-btn:active:not(:disabled){transform:translateY(0)}.submit-btn:disabled{opacity:.6;cursor:not-allowed}.loading-spinner{display:inline-block;animation:spin 1s linear infinite}.welcome-message{text-align:center;padding-top:20px;border-top:1px solid #e0e0e0}.welcome-message p{font-size:14px;color:#666;margin:0}@media (max-width: 500px){.login-card{padding:30px 20px;margin:10px}.app-logo{font-size:50px}.app-title{font-size:24px}.language-selector-wrapper{top:15px;right:15px}}.dashboard-container{min-height:100vh;background:#f5f5f5}.dashboard-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.5rem 2rem;box-shadow:0 2px 10px #0000001a}.header-content{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.header-content h1{font-size:1.8rem;font-weight:700}.header-actions{display:flex;gap:1rem;align-items:center}.logout-btn{padding:.5rem 1.5rem;background:#fff3;color:#fff;border:2px solid white;border-radius:8px;font-weight:600;cursor:pointer;transition:all .3s ease}.logout-btn:hover{background:#fff;color:#667eea}.dashboard-main{max-width:1200px;margin:0 auto;padding:2rem}.welcome-section{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 2px 8px #0000001a;margin-bottom:2rem}.welcome-section h2{font-size:2rem;color:#333;margin-bottom:.5rem}.user-email{color:#666;font-size:1rem}.coming-soon{background:#fff;padding:3rem 2rem;border-radius:12px;box-shadow:0 2px 8px #0000001a;text-align:center}.coming-soon h3{font-size:2rem;color:#667eea;margin-bottom:1rem}.coming-soon p{font-size:1.2rem;color:#666;margin-bottom:2rem}.features-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;max-width:800px;margin:0 auto}.feature-item{padding:1rem;background:#f8f9ff;border-radius:8px;font-weight:500;color:#333}@media (max-width: 768px){.header-content{flex-direction:column;gap:1rem}.dashboard-main{padding:1rem}.welcome-section h2{font-size:1.5rem}}.app{min-height:100vh}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:1rem}.loading-screen p{font-size:1.2rem;color:#fff}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}#root{min-height:100vh}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.loading-spinner{font-size:3rem;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}