*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:#f0f2f5;color:#333;line-height:1.6;min-height:100vh}.auth-page{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px}.auth-form{background:#fff;padding:40px;border-radius:12px;box-shadow:0 2px 12px #00000014;width:100%;max-width:400px}.auth-form h2{text-align:center;margin-bottom:24px;color:#1a1a2e;font-size:24px}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-weight:500;color:#555;font-size:14px}.form-group input{width:100%;padding:10px 14px;border:1px solid #ddd;border-radius:8px;font-size:15px;transition:border-color .2s;outline:none}.form-group input:focus{border-color:#4a6cf7;box-shadow:0 0 0 3px #4a6cf71a}.error-message{background:#fff0f0;color:#e74c3c;padding:10px 14px;border-radius:8px;margin-bottom:16px;font-size:14px;border:1px solid #ffd4d4}.btn-primary{width:100%;padding:12px;background:#4a6cf7;color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover{background:#3a5ce5}.btn-primary:disabled{background:#a0b4f8;cursor:not-allowed}.auth-link{text-align:center;margin-top:16px;font-size:14px;color:#888}.auth-link a{color:#4a6cf7;text-decoration:none;font-weight:500}.auth-link a:hover{text-decoration:underline}.dashboard{max-width:640px;margin:0 auto;padding:20px}.dashboard-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px;padding-bottom:16px;border-bottom:1px solid #e8e8e8}.dashboard-header h1{font-size:24px;color:#1a1a2e}.user-info{display:flex;align-items:center;gap:12px}.user-info span{color:#666;font-size:14px}.btn-secondary{padding:8px 16px;background:#fff;color:#666;border:1px solid #ddd;border-radius:8px;cursor:pointer;font-size:14px;transition:all .2s}.btn-secondary:hover{background:#f5f5f5;color:#333}.dashboard-main{background:#fff;border-radius:12px;box-shadow:0 2px 12px #00000014;padding:24px}.todo-form{display:flex;gap:8px;margin-bottom:24px}.todo-input{flex:1;padding:10px 14px;border:1px solid #ddd;border-radius:8px;font-size:15px;outline:none;transition:border-color .2s}.todo-input:focus{border-color:#4a6cf7;box-shadow:0 0 0 3px #4a6cf71a}.todo-form .btn-primary{width:auto;padding:10px 24px}.todo-list{display:flex;flex-direction:column;gap:8px}.empty-state{text-align:center;color:#999;padding:40px 0;font-size:15px}.todo-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:#fafafa;border:1px solid #eee;border-radius:8px;transition:all .2s}.todo-item:hover{background:#f5f5f5}.todo-item.completed{opacity:.7}.todo-item.completed .todo-title{text-decoration:line-through;color:#999}.todo-checkbox{display:flex;align-items:center;cursor:pointer}.todo-checkbox input{width:18px;height:18px;cursor:pointer;accent-color:#4a6cf7}.todo-title{flex:1;cursor:pointer;font-size:15px}.btn-delete{background:none;border:none;color:#ccc;cursor:pointer;font-size:18px;padding:4px 8px;border-radius:4px;transition:all .2s;line-height:1}.btn-delete:hover{color:#e74c3c;background:#fff0f0}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;color:#888;gap:12px}.loading-spinner{width:36px;height:36px;border:3px solid #e8e8e8;border-top-color:#4a6cf7;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}